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1
Dickson, Blair Thomas. „Neurophysiological markers of vigilance and mental fatigue“. Thesis, University of Bristol, 1998. http://hdl.handle.net/1983/80f9e7d0-7dd3-4b15-9244-2b101c9cc1a6.
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Jahandideh, Sina. „Job Scheduling Considering Both Mental Fatigue and Boredom“. Thesis, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/20637.
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Numerous aspects of job scheduling in manufacturing systems have been the focus of several studies in the past decades. However, human factors in manufacturing systems such as workers’ mental conditions are still neglected issues and have not received adequate attentions. Job boredom and mental fatigue are both aspects of workers’ mental condition. They affect work performances by increasing sick leave duration and decreasing work productivity. On the other hand, job rotation could be an alternative strategy to cope with such human issues at work. The benefits of job rotation for both employees and firms have been widely recognized in the literature. Although some studies found job rotation as a means to reduce workers' physical work-related traumas, they did not consider the effect of variable mental conditions on workers. Despite the proven importance of boredom and mental fatigue at the workplace, they have not been a combined precise objective of any job rotation problem in current literature.
The study of mental conditions proposed in this paper attempts to extend the previous works by addressing new methods and developing a feasible solution to increase manufacturing productivity. A new job scheduling program has been designed specifically which combines a new job rotation model and a job assignment method.
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Andrews, Charles H. „The relationship between sleep regimen and performance in United States Navy recruits“. Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Sept%5FAndrews.pdf.
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Wu, Cheng Kam-chee Polina, und 胡鄭金枝. „The effect of mental training in delaying muscle fatigue“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B29768585.
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Amatya, Pooja Laxmi. „Self-Compassion and Compassion Fatigue in Mental Health Professionals“. Xavier University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=xavier1493311585146183.
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6
Wu, Cheng Kam-chee Polina. „The effect of mental training in delaying muscle fatigue /“. Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk:8888/cgi-bin/hkuto%5Ftoc%5Fpdf?B23294991.
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Kadambi, Pooja. „Brain Computer Interface for Fatigue Assessment“. University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1393237787.
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Ferreira, Dias Kanthack Thiago. „Interdependent relationships between the mental representation and psychophysiological correlates of action“. Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1166/document.
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L’objectif de ce travail était d’apporter des données encore inconnu sur la relation entre les corrélats neurophysiologiques de l’action et la représentation mentale. Un ensemble de six expérimentations ont été menées. Celles-ci nous ont permis de mieux comprendre les modalités d’utilisation de l’imagerie motrice qu’elle soit concomitante ou réaliser après la pratique réelle. Les effets de la pratique physique sur la capacité d’utilisation de l’imagerie motrice ont aussi été explorés. Nos résultats montrent que l’imagerie motrice est très efficace, qu’elle soit pratiquée de manière concomitante à la pratique réelle ou après celle-ci lorsque la fatigue physique est importante. Nous démontrons que des capacités d’imagerie élevées ne sont pas systématiquement reliées à une amélioration de la performance. De manière inédite nous démontrons que la pratique réelle peut–être bénéfique pour la capacité d’imagerie motrice d’une habilité fortement automatisée. De plus, des sessions de pratique physique prolongées et intermittentes semblent plus perturber la capacité d’imagerie motrice qu’une pratique continue. L’ensemble de ces résultats est une contribution importante aux connaissances relatives à l’utilisation de l’imagerie motrice dans la réhabilitation ou encore dans la pratique physiqueThe main purpose of the present work was to add substantial data regarding the psychophysiological correlates of action with respective mental representation. A total of six experimental protocols were developed to understand the mechanisms of using motor imagery concomitant and after actual practice, and the effects of exercise on motor imagery ability. According to our findings, motor imagery can very be usefull when performed concomitant with actual practice and even after an exercise session, when fatigue is most present. We demonstrate that higher levels of motor imagery ability are not always linked with greater performance enhancement. Unprecedentedly, we reported that an exercise session might even be beneficial for motor imagery ability of high-automated task. In addition, prolonged intermittent exercise session are more likely to impair motor imagery ability in comparison with continuous exercise. These findings are of special interest of sports coaches and rehabilitation professionals, which usually incorporate motor imagery into their physical training sessions
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Al-Libawy, H. A. „Detection, prediction and modelling of mental fatigue in naturalistic environment“. Thesis, University of Liverpool, 2018. http://livrepository.liverpool.ac.uk/3015856/.
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Operator mental fatigue in workplace can result in serious mistakes which have dangerous and life-threatening consequences. Fatigue assessment and prediction are, therefore, considered critical safety requirements that cut across modes and operations of numerous high-risk environments and industries such as nuclear and transportation. However, robust, accurate and timely assessment of fatigue (or alertness) is still a challenging task for many reasons. The majority of operator fatigue studies are still being carried out in simulation environments, overlooking operator's naturalistic behaviour and fatigue growth. Moreover, most of the available systems rely on using a single fatigue-related data source, which is clearly a major drawback that affects operation, performance, accuracy and reliability of the system in case this source fails. With multi-data sources in an integrated system, the system might stop working in the event of losing one or more data sources or at least becomes inaccurate or unreliable. Furthermore, paying no attention to human individual differences working as an operator in mission-critical jobs related to fatigue growth and in response to fatigue deleterious effect is another serious issue with the current fatigue assessment and prediction systems. The research work presented in this thesis proposes a novel fatigue assessment approach, which addresses the aforementioned issues with fatigue detection and prediction system. This is achieved by developing and realising algorithms based on data collected from participants in naturalistic environments. Numerous experiments have been conducted to cover a wide range of fatigue-related tasks which are broadly grouped into two categories: biological and behavioural (performance) experiments. The biological-based experiments employ various data types such as heart rate, skin temperature, skin conductance and heart rate variability. These fatigue-related data types are used to build the proposed fatigue detection system, and the obtained results have demonstrated high accuracy and reliability (94.5% accuracy in naturalistic environments). The behavioural-based category includes two experiments: keyboard typing and driving task. The typing experiments have been carried out using computer keyboard and smartphone virtual keyboard, and have confirmed enhanced operator fatigue detection accuracy (94%). The driving experiments were conducted in naturalistic driving environments, and the used algorithms have demonstrated a new framework for driver fatigue detection using smartphone inertial sensors based on a novel vehicle heading algorithm. A prototype system was designed and built with a modular structure so as to allow the addition of multiple fatigue-related biological and behavioural sources. This modular structure was tested under different situations that involve losing one or more sources. In addition, the circadian rhythm, which is a main input to fatigue/alert regulators, was customised for each operator and modelled based on biological data collected from wearable devices. The constructed model captures individual differences of operators, which is a challenge in current systems. Such multi-source, modular and non-intrusive approach for fatigue/alertness assessment and prediction is expected to be of superior performance, low-cost and favourable by users compared to existing systems. Furthermore, it addresses other challenges of current fatigue systems by carrying out fatigue assessment in naturalistic environments and considering operator individual differences in response to fatigue. In addition, the modular structure of the proposed system helps improving robustness and accuracy against losing one or more input sources (accuracy for 4 sources: 91%, 3 sources: 87%, 2 sources: 77%). Following the proposed approach will definitely enhance the reliability of fatigue assessment systems, improve operator safety, productivity and reduce financial fatigue impacts. Moreover, the proposed system has proven to be non-intrusive in nature and of low implementation cost. The results obtained after testing the proposed system have been very promising to support the aforementioned benefits.
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Flindall, Ian Richard. „Acute mental fatigue and cognitive performance in the medical profession“. Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/46165.
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Fatigue induced deterioration in cognition has significant implications for working practice within the National Health Service. Although attitudes are changing, few safety measures have been implemented to reduce fatigue related error. The World Health Organisation Operative Checklist is one error prevention strategy developed to address error preoperatively. With rising negligence costs there is an argument for error rates persisting, if not increasing, despite the European Working Time Directive (EWTD). Although work hour limitations have attempted to be met by employers, the ability to take four hourly breaks is not easily manageable or regulated due to impingement by patient care. Requests by employers for staff to opt out of the EWTD have occurred due to the system being unable to function within the directive. Fatigue caused through variations in circadian rhythms is not accounted for by the EWTD. Fatigue is a recognised cause of memory lapses, impaired communication and judgement. Individuals can experience emotional blunting, lapses in attention and experience difficulty in maintaining focus. Public complaints reflect the aspects of care that they see. The fatigue related breakdown in inter-personal skills is certainly a contributing factor. Clinical information forms the basis for decisions on which we act. Inaccurate information, uncertainty in our recollection or inability to recall important facts can place patient safety at risk. This thesis investigates the impact of fatigue on the recall of clinical information in the non-sleep deprived state. Chapter 1 is the introduction and discusses the principles of the National Health Service (NHS) and why acute mental fatigue should be prevented, Chapter 2 introduces the concept of “memory” and the theories to its mechanism of action. It provides background on the approach to improving the recall of information. Chapter 3 is a systematic review of Acute Mental Fatigue in the non-sleep deprived state and highlights the impact of fatigue within healthcare organisations. Chapter 4 describes neuroenhancement and reviews the pharmacological agent Modafinil, discussing its possible applications for use in cognitive fatigue. Chapter 5 is a survey to provide background levels of fatigue in NHS doctors post EWTD. Chapter 6 is a randomised crossover study investigating recall of clinical information in the mentally fatigued, non-sleep deprived state. The subsequent Chapter 8 and 9 develop cognitive and pharmaceutical intervention strategies to improve recall of clinical information. Chapter 8 investigates the recall of clinical information after a working day in a randomised crossover study comparing a computerised handover checklist (using cognitive cues) to current handover methodology. Chapter 9 compares neuropharmacology to cognitive strategies of cue based recall to enhance recall of clinical information. Finally, the discussion in Chapter 10 reflects on the strengths and weaknesses of these studies and possible implications for the clinical practice.
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Bloesch, Emily Keller. „The Differential Effects of Mental Fatigue and Alcohol on Selective Attention“. TopSCHOLAR®, 2008. http://digitalcommons.wku.edu/theses/14/.
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Newton, Sunni Haag. „The effects of caffeine on cognitive fatigue“. Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31799.
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Thesis (M. S.)--Psychology, Georgia Institute of Technology, 2010.Committee Chair: Dr. Phillip L. Ackerman; Committee Member: Dr. Paul Corballis; Committee Member: Dr. Ruth Kanfer. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Booras, Mark C. „The relationship of mental skills to performance on a tennis accuracy task under fatigued and non-fatigued conditions“. Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2215.
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Thesis (M.S.)--West Virginia University, 2001.Title from document title page. Document formatted into pages; contains xi, 86 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 79-86).
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McGillem, Misty Autumn, und Misty Autumn McGillem. „Exploring Compassion Fatigue Among Mental Health Providers in Community-Based Outpatient Organizations“. Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/623253.
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Background: Providing care to individuals with multifaceted mental health needs can be very demanding and in turn leave mental health professionals at an increased risk for compassion fatigue (CF). Comprised of Burnout (BO), Secondary Traumatic Stress (STS), and a lack of Compassion Satisfaction (CS), CF is the state of exhaustion and dysfunction, emotionally, biologically, and physiologically, due to prolonged exposure to compassion stress. CF can leave healthcare providers at an increased risk for experiencing their own health issues, contributing to tardiness and absenteeism, as well as increasing the risks for such adverse effects as clinical and medication errors, poor treatment planning, and decreased patient satisfaction. Purpose: The purpose of this paper is to identify the risk factors for CF and describe the perceptions of CF among outpatient mental health providers employed in urban community-based mental health outpatient organization. Method and Sampling: A qualitative descriptive study design utilizing two focus groups, each having four participants was conducted to assess outpatient mental health providers’perceptions of CF. Purposeful sampling of current providers in two community-based mental health outpatient organizations was performed to protect the privacy and enhance the comfort of each participant as they discussed elements of CF. Findings: Five themes were identified from the focus group analysis: the participant’s perceived definition of CF, participant perceptions of prevalence of CF in the mental health setting, participant perceptions regarding the triggers, perceived participant causes of CF, and self-care practices. These results reflect data collected in a mental health setting however, the findings are consistent with current research contributed from other specialties. Conclusion: Personal descriptions of the experiences and insights of these providers expand the current CF literature and will contribute to the development of quality improvement projects committed to reducing compassion fatigue among outpatient mental health providers.
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FILIPAS, LUCA. „THE EFFECT OF MENTAL FATIGUE ON SPORT-SPECIFIC PHYSICAL AND TECHNICAL PERFORMANCE“. Doctoral thesis, Università degli Studi di Milano, 2020. http://hdl.handle.net/2434/697519.
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Introduction: Acute mental fatigue is defined as a psychobiological state that may arise during or after prolonged cognitive activities. Despite several studies showed that mental fatigue appears to impair sport performance, the scientific comprehension of this topic is still limited. Therefore, the aim of this thesis is to broaden the knowledge on the effects of mental fatigue on the sport-related performance. Study 1: This study aimed to investigate the effect of mentally demanding cognitive tasks on rowing performance in prepubertal athletes. Seventeen young rowers completed three separate testing sessions during which they performed three different cognitive tasks before completing a 1500 m time trial on the rowing ergometer. In the two experimental conditions, one hour of a standard cognitive task (Stroop task) and an arithmetic school test were used to elicit mental effort; in the control condition a time-matched, not demanding activity was carried out (painting). The performance of the time trial did not differ between conditions; physiological and perceptual measures recorded during the physical task were not affected by the conditions. Study 2: This study investigated the effect of a mentally demanding response inhibitory task on time trial performance in sub-elite under 23 cyclists. Ten under 23 road cyclists completed two separate testing sessions during which they performed two different cognitive tasks before completing a 30-min time trial on the cycle ergometer. In the experimental condition, 30 min of a standard cognitive task (Stroop task) was used to elicit mental fatigue; in the control condition, a non-demanding activity was carried out. Mean power output and cadence were negatively affected by the Stroop task, while heart rate (HR), rating of perceived exertion (RPE), blood lactate concentration, and heart rate variability (HRV) did not differ between the two conditions. Study 3: This investigation examined the effects of mental fatigue on soccer-specific physical and technical performance in young players. Twelve under-14 (U14), twelve under-16 (U16) and twelve under-18 (U18) soccer players completed the two parts of the investigation. Part one assessed the soccer-specific physical performance using the Yo-Yo Intermittent Recovery Test, Level 1 (Yo-Yo IR1). Part two assessed the soccer-specific technical performance using the Loughborough Soccer Passing and Shooting Tests (LSPT, LSST). Each part was preceded by 30 min of Stroop task (mentally fatiguing task) or 15 min of reading magazines (control task) performed in a randomised and counterbalanced order. Mental fatigue significantly reduced Yo-Yo IR1 distance in the three age groups, alongside an increase in HR and RPE. Mental fatigue reduced soccer-specific physical performance in U14, U16 and U18 players, without alteration of technical performance, except for LSPT in U18. Study 4: This study investigated whether 4 weeks of endurance training could improve tolerance to mental exertion in untrained participants. Twenty participants completed a 4-week training protocol in a randomised and counterbalanced order. Baseline and follow-up assessment were conducted over three sessions in the week preceding and following the training period. During session 1, participants completed an incremental maximal ramp test. During sessions 2 and 3 participants completed a 15 min cycling time trial preceded by either a mental exertion or control task (counterbalanced). Following baseline assessments, participants were randomised into a physical training or placebo group that completed the training intervention thrice weekly over four weeks. The physical training resulted in increases in peak oxygen consumption (VO2peak) relative to the placebo group. Physical training group increased their time trial distance following the mental exertion task to a greater extent than the placebo group. RPE during the time trial and perceptual measures of mental exertion did not significantly change between groups. Conclusions: This thesis provides insight into the effects of mental fatigue on sport-specific physical and technical performance, focusing in broaden the knowledge on different age-groups and evaluating, for the first time, the effect of an endurance training protocol on the ability to tolerate mental fatigue.
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Carroll, Cliodhna. „Correlates and predictors of apathy, depression and fatigue post-stroke“. Thesis, Canterbury Christ Church University, 2014. http://create.canterbury.ac.uk/12794/.
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Stroke is a leading cause of disability in the UK and has a range of psychological sequelae including apathy, depression and fatigue. Psychological consequences of stroke have been associated with poor rehabilitation outcomes. Apathy, depression and fatigue are often considered to overlap and the research indicates that they may occur both independently and in unison after stroke. Sixty-three people aged over 55 years who had a stroke and lived in the community were included in this study. They were assessed using the Apathy Evaluation Scale, Geriatric Depression Scale, the Fatigue Severity Scale and the Barthel index. Socio-demographic data were also collected along with information about their stroke. 60.3% of participants reached cut-off levels for apathy, 58.6% for depression and 58.7% for fatigue. While there was an overlap in terms of these psychological disorders, they also occurred independently. Physical functioning was the only factor which was related to apathy, depression and fatigue. Apathy was a mediator in the relationship between physical functioning and depression; and depression was a mediator in the relationship between apathy and fatigue. Based on these findings, a significant structural equation model accounting for the relationships between apathy, fatigue, physical functioning and depression was developed. The study concluded that apathy, depression and fatigue are common post-stroke. The inter-relationships between these post-stroke sequelae are also related to the person’s physical functioning and not to age, side of weakness or time since stroke. Results have implications in terms of the clinical assessment and management of post-stroke psychological sequelae.
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Gurney, Angela. „The effect of challenging inhibitory tasks on subsequent susceptibility to unconscious influences“. Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/76490/.
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Previous research has examined a variety of behavioural effects, thought to stem from mental exhaustion, following the prior use of inhibitory control. Here we attempt to examine whether such effects are apparent in unconscious behaviours. Chapter 1 demonstrates no effect of prior use of inhibitory control on subsequent susceptibility to subliminal priming of neutral (Experiment 1) and reward (Experiment 2) terms. Chapter 2 explores whether the prior use of inhibitory control influences the degree of susceptibility to an alternative source of influence, hypnotic induction, and provides the novel finding that inhibitory impairment does not affect hypnotic response. Chapter 3 utilises behavioural and fMRI imaging data to examine changes in a conscious facet of human experience often moderated by unconscious influences: emotion regulation. The results support a period of increased mood lability following a challenging inhibitory control task. However, we were unable to provide evidence of any underlying change in cortical activation and connectivity. Finally, Chapter 4 investigates whether this heightened mood lability following prior inhibitory control would also be mirrored in ratings of emotion attributed to positive and negatively valenced images (Experiment 1) and additionally, whether a mindfulness induction, previously documented to improve emotion regulation, would reduce individuals' perception of the degree of valence attributed to the same images (Experiment 2). Contrary to predictions, we report substantial evidence for no effect of prior inhibitory control or a brief mindfulness manipulation on subsequent ratings of emotionally valenced stimuli. Taken together the research indicates that mental exhaustion arising from the use of self-control appears to have no effect on susceptibility to unconscious priming, hypnotic suggestions, and no effect on the perception of emotionally valenced images. However, prior use of inhibitory control does appear to affect the degree of emotional lability experienced following music.
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Smallwood-Butts, Kina Lori. „Burnout, Compassion Fatigue, and the Utilization of Evidence-Based Practices by Mental Health Professionals“. Diss., Temple University Libraries, 2012. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/166257.
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Educational PsychologyPh.D.
Burnout is a construct first proposed by Freudenberger to describe a condition that develops in people who work with people such as teachers, nurses and first responders (Shan, 2005). Professionals who are burned out demonstrate a lack of concern for the people they service and often perform poorly on the job. In recent years, the construct of Burnout has been largely replaced by the construct of Compassion Fatigue. Interestingly, mental health professionals who work with children as their predominant client base have not been extensively studied, although these professionals arguably could be experiencing some of the highest levels of Compassion Fatigue (Eastwood, 2008). Research shows that Burnout and Compassion Fatigue impact the work that an individual performs, but the impact of these on the use of particular therapeutic practices as an area is less studied. The present study sought to determine if there is a relationship between Burnout, Compassion Fatigue, and the use of evidence-based practices in mental health professionals. Using research by Craig and Sprang (2010) as the starting point, this study also investigated whether mental health professionals who work with children experience more or less Burnout and Compassion Fatigue than those who work with adults. Mental health professionals from a variety of mental health facilities in the Philadelphia region served as subjects in this study. Participants were given the Trauma Practices Questionnaire (TPQ), a 22-item treatment practices utilization scale, the Professional Quality of Life Scale-V (PRoQOL-V), a 30-item scale that required respondents to assess their thoughts and feelings in relation to their work, and a questionnaire formulated by this investigator that included demographic information, background information, as well a question that focused on the age of the mental health professional's client base and a question that focused on years of professional experience. The results showed that the mental health professionals who worked with adults were older, more typically white, had higher levels of education and had undergraduate majors that were in psychology or a psychology-related area (e.g., social work) than mental health professionals who worked with children. Burnout and Compassion Fatigue correlated negatively with all practices, evidence based and non-evidence based. Males used more evidence-based and total practices than females. Females had a higher level of Compassion Satisfaction but also a higher level of Burnout. The results showed that the mental health professionals who worked with children had higher levels of Compassion Satisfaction, but also higher levels of Burnout. The data show that the group that works with children used less cognitive and behavioral approaches. The broader implications of the results are discussed in the conclusion.
Temple University--Theses
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Linden, Dimitri van der. „Mental fatigue and goal-directed behavior: flexibility, planning and the regulation of actions“. [S.l. : Amsterdam : Kurt Lewin Instituut] ; Universiteit van Amsterdam [Host], 2002. http://dare.uva.nl/document/64093.
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Huysamen, Kirsten Christina. „Validation of an assessment tool for mental fatigue applied to rotational shift work“. Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013551.
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Mental fatigue has been proven to be highly prominent during shift work, due to long, irregular working hours and disruption of the circadian rhythm. Measuring mental fatigue has been a challenge for many years, where commonly cognitive test tasks are used to assess mental fatigue. Moreover, these test tasks do not isolate where fatigue is occurring during human information processing. The human information processing system consists of four core stages, each of which requires numerous cognitive functions in order to process information. The Human Kinetics and Ergonomics Department at Rhodes University has developed six cognitive test tasks where each isolates a cognitive function: an accommodation test task, a visual detection test task, a reading test task, a memory test task, a tapping test task and a neural control test task. The cognitive functions include: eye accommodation, visual discrimination, visual pattern recognition, memory duration, motor programming and peripheral neural control. General task-related effect can also be examined for each of these cognitive test tasks which include choice reaction time, visual detection, reading performance, short-term memory, motor control and tracking performance. Additionally, a simple reaction time test task has been developed to analyse simple reaction time. This test task does not isolate a cognitive function. One or more parameters can be examined for each cognitive function and task-related effect. The first aim of this study was to validate numerous cognitive test tasks for mental fatigue in a simulated shift work laboratory setting. The second aim was to assess the validated cognitive test tasks in Phase 1 in a field-based rotational shift work setting. Parameters revealing sensitivity to mental fatigue would be validated for mental fatigue applied to rotational shift work and would be inserted into an assessment tool. In the laboratory setting, the seven cognitive test tasks were examined on four different types of shift work regimes. The first regime was a standard eight-hour shift work system, and the other three were non-conventional shift work regimes. Participants (n = 12 per regime) were required to complete one day shift followed by four night shifts, where testing occurred before and after each shift and four times within each shift. The cognitive test tasks revealing sensitivity to fatigue included: visual detection test task, reading test task, memory test task, tapping test task, neural control test task and simple reaction time test task. The testing of Phase 2 was conducted in three different companies, where each performed a different type of rotational shift work. The six cognitive test tasks validated for mental fatigue in Phase 1 were tested before and after work for each shift type within the rotational shift work system adopted by each company. Company A (n = 18) and Company B (n = 24) performed two-shift rotational shift work systems, where the shift length of Company A was 12-hours and the shift length of Company B was irregular hours. Company C (n = 21) performed an eight-hour three-shift rotational shift work system. Nine parameters revealed fatiguing effects and were inserted into the assessment tool, five of which provided information on a specific cognitive function: error rate for visual discrimination, processing time for visual pattern recognition, error rate for visual pattern recognition, impact of rehearsal time on memory recall rate for memory duration and the high-precision condition for motor programming time. The remaining four parameters provided information on general task-related effects: reading speed for reading performance, recall rate for short-term memory, reaction time for motor control and simple reaction time. Therefore, an assessment tool comprising nine parameters was validated for mental fatigue applied to rotational shift work, where five of the parameters were able to isolate exactly where fatigue was occurring during human information processing and the other four parameters were able to assess fatigue occurring throughout the human information processing chain.
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Hodgetts, Vanessa. „The effect of feeding an oral solution of branched-chain amino acids on prolonged mental performance“. Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320228.
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Hachard, Betty. „Influence de la fatigue sur le contrôle postural : spécificités des effets d’une fatigue musculaire volontaire ou électro-induite et impact d’une fatigue mentale occasionnée par une tâche cognitive prolongée“. Thesis, Pau, 2019. http://www.theses.fr/2019PAUU3055/document.
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L’objectif général de ce travail doctoral était d’étudier les effets de la fatigue (physique et mentale) sur le contrôle postural. Tout d’abord, les effets de la fatigue musculaire du quadriceps fémoral induite par des contractions volontaires et des contractions électro-induites ont été comparés. Les résultats ont montré que des contractions volontaires altéraient davantage le contrôle postural que des contractions électro-induites pour une perte de force musculaire équivalente. Ceci s’expliquerait par la présence d’une fatigue centrale après les contractions volontaires, ainsi qu’une sollicitation différente des fibres musculaires entre les deux modalités de contraction. Des mécanismes compensatoires seraient mis en œuvre après ces deux modalités de contractions fatigantes, mais de façon plus prononcée pour les contractions volontaires. Concernant la fatigue mentale, les effets d’une tâche cognitive exigeante et prolongée sur ordinateur (induisant un état de fatigue mentale) et d’un visionnage de documentaire (tâche contrôle) sur le contrôle postural ont été comparés. De prime abord, la fatigue mentale affecterait le contrôle postural en condition de privation visuelle, en réduisant l’efficacité des stratégies d’attention associatives. De façon surprenante, visionner un documentaire conduirait également à une altération du contrôle postural, potentiellement en raison du maintien prolongé d’une posture assise affaissée. La posture assise pourrait ainsi constituer un facteur confondant dans les protocoles expérimentaux comportant une évaluation posturale. Une analyse statistique de classification en cluster hiérarchique a permis de mettre en évidence des sensibilités différentes au sein des individus à l’égard de la tâche mentalement fatigante. Le niveau de fatigue mentale serait associé au niveau de dégradation du contrôle postural sur un support stable avec les yeux ouverts. La réalisation d’une tâche cognitive prolongée exigeant une attention visuelle soutenue face à un écran d’ordinateur provoquerait une fatigue visuelle. Cette fatigue visuelle affecterait différemment les individus. Elle toucherait plus particulièrement les sujets les plus dépendants des informations visuelles, pour lesquels le contrôle postural se dégraderait davantage que les autres individusThe overall objective of this doctoral work was to study the effects of fatigue (physical and mental) on postural control. First, the effects of femoral quadriceps muscle fatigue induced by voluntary contractions and electro-induced contractions were compared. The results showed that voluntary contractions affected postural control more than electro-induced contractions for an equivalent loss of muscle strength. This could be explained by the presence of central fatigue after voluntary contractions, as well as a different strain on muscle fibres between the two modes of contraction. Compensatory mechanisms would be implemented after these two modes of tiresome contractions, but more pronounced for voluntary contractions. With regard to mental fatigue, the effects of demanding and prolonged cognitive computer work (inducing mental fatigue) and documentary viewing (task control) on postural control were compared. At first glance, mental fatigue would affect postural control in conditions of visual deprivation, reducing the effectiveness of associative attention strategies. Surprisingly, viewing a documentary would also lead to an alteration in postural control, potentially due to the prolonged maintenance of a collapsed sitting posture. Sitting posture could thus be a confounding factor in experimental protocols involving postural evaluation. A statistical analysis of hierarchical cluster classification revealed different sensitivities within individuals towards the mentally demanding task. The level of mental fatigue would be associated with the level of degradation of postural control on a stable support with eyes open. Performing a prolonged cognitive task requiring sustained visual attention to a computer screen would cause visual fatigue. This visual fatigue would affect individuals differently. It would particularly affect the subjects most dependent on visual information, for which postural control would be more degraded than other individuals
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Birch, Cai Owain. „How does mental and physical fatigue affect a rugby player’s force production during scrummaging?“ Thesis, Gymnastik- och idrottshögskolan, GIH, Institutionen för idrotts- och hälsovetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-4610.
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Aims: This study investigates the effects of physical fatigue, mental fatigue and their combinations on the ability of rugby players to produce force during rugby scrummaging. Method: 10 male subjects (Mean age = 27.4 ± 3.92, Weight =102.9kg ± 10.96) were recruited from local rugby union football clubs in the Stockholm area. Scrummaging force measurements were collected following and before treatments (control), after a 30-min mental task and after a physical fatigue protocol. The mean peak force was calculated by averaging the force data 1 second around the highest peak of force during a 5 second sustained push. Results: Mean force decreased significantly after the physical fatigue (PF) protocol compared to the control (CON) (PF = 1740 ± 342 N vs. CON = 2007.5 ± 359 N. P= 0.0009) and combinations of physical and mental fatigue (PMF) or mental and physical fatigue (MPF) were also found to significantly decrease compared to the control (PMF = 1750 ± 348N vs. CON = 2007.5 ± 359N. P=0.0014 and MPF = 1818 ± 335N vs. CON = 2007.5 ± 359N. P=0.026). Mental fatigue did not significantly decrease mean peak force during the sustained push of a rugby scrum (MF = 1912 ± 321N vs. CON = 2007.5 ± 359N. P=0.52). Conclusion: Physical fatigue reduces the ability of rugby players to produce force during rugby scrummaging, however mental fatigue does not. Furthermore, mental fatigue does not exacerbate the effects of physical fatigue on scrummaging performance.
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Roy, Raphaëlle N. „Étude de corrélats électrophysiologiques pour la discrimination d'états de fatigue et de charge mentale : apports pour les interfaces cerveau-machine passives“. Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT041.
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L'estimation de l'état mental d'un individu sur la base de son activité cérébrale et de ses activités physiologiques résultantes est devenue l'un des challenges des interfaces cerveau-machine (ICM) dites passives, dans le but notamment de répondre à un besoin en neuroergonomie. Ce travail de thèse se focalise sur l'estimation des états de fatigue et de charge mentale. Son objectif est de proposer des chaines de traitement efficaces et réalistes dans leur mise en œuvre. Ainsi, un des points à l'étude a été la modulation des indicateurs de charge ainsi que la robustesse des performances de classification en fonction du temps passé sur une tâche (TPT). L'impact de la charge et du TPT sur les marqueurs d'état attentionnel a aussi été évalué. Pour ce faire, un protocole expérimental a été mis en œuvre afin de recueillir les signaux électro-encéphalographiques (EEG), cardiaques (ECG) et oculaires (EOG) de participants volontaires sains lors de la réalisation prolongée d'une tâche combinant charge en mémoire de travail et attention sélective. Des chaînes de traitement performantes incluant une étape de filtrage spatial et une classification supervisée ont été mises en place afin de classer au mieux ces états. La pertinence de plusieurs marqueurs électrophysiologiques a été comparée, notamment l'activité EEG spontanée et les potentiels évoqués (PEs), ainsi que différentes étapes de prétraitement dont les méthodes de filtrage spatial pour PEs. Des effets d'interactions ont été mis au jour entre les différents états mentaux, dont un effet négatif du TPT sur les performances en classification de la charge mentale lorsque l'on utilise des marqueurs mesurant la puissance moyenne de l'EEG dans des bandes de fréquence d'intérêt. La chaîne basée sur les PEs est en revanche robuste à cet effet. Une comparaison du type de stimuli utilisables pour éliciter les PEs a révélé que des stimuli tâche-indépendants permettent tout de même d'obtenir des performances très élevées, ce qui montre leur pertinence pour une implémentation en situation réelle. En perspective seront présentés des travaux en cours visant à mettre en évidence des marqueurs de charge mentale robustes à la tâche, ainsi que l'utilité des potentiels évoqués auditifs en paradigme de simple stimulusMental state estimation on the basis of cerebral activity and its resulting physiological activities has become a challenge for passive Brain-Computer Interfaces (BCI), in particular to address a need in neuroergonomics. This thesis work focuses on mental fatigue and workload estimation. Its purpose is to provide efficient and realistic processing chains. Thus, one issue was the modulation of workload markers as well as classification performance robustness depending on time-on-task (TOT). The impact of workload and TOT on attentional state markers was also assessed. For those purposes, an experimental protocol was implemented to collect the electroencephalographic (EEG), cardiac (ECG) and ocular (EOG) signals from healthy volunteers as they performed for a prolonged period of time a task that mixes working memory load and selective attention. Efficient signal processing chains that include spatial filtering and classification steps were designed in order to better estimate these mental states. The relevance of several electrophysiological markers was compared, among which spontaneous EEG activity and event-related potentials (ERPs), as well as various preprocessing steps such as spatial filtering methods for ERPs. Interaction effects between mental states were brought to light. In particular, TOT negatively impacted mental workload estimation when using power features. However, the chain based on ERPs was robust to this effect. A comparison of the type of stimuli that can be used to elicit the ERPs revealed that task-independent probes still allow very high performance, which shows their relevance for real-life implementation. Lastly, ongoing work that aims at assessing task-robust workload markers, as well as the usefulness of auditory ERPs in a single-stimulus paradigm will be presented as prospects
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Jarchi, Delaram. „Estimation of single trial ERPs and EEG phase synchronization with application to mental fatigue“. Thesis, University of Surrey, 2011. http://epubs.surrey.ac.uk/804408/.
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Jacquet, Thomas. „La fatigue mentale : marqueurs électrophysiologiques et stratégies de compensation“. Thesis, Bourgogne Franche-Comté, 2021. http://www.theses.fr/2021UBFCK006.
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La fatigue mentale est un phénomène courant dans la société actuelle provoquant une altération des performances cognitives comme physiques. Elle peut conduire à une augmentation des risques d’accident, une baisse de productivité, et à certaines pathologies comme la dépression. L’objectif de ce travail de thèse était d’étudier le phénomène de fatigue mentale en examinant plus spécifiquement ses marqueurs électrophysiologiques, ainsi que de trouver des stratégies de compensation pour limiter et/ou éviter ses effets délétères.La première étude a identifié des modulations de l’activité cérébrale lors d’une tâche prolongée de Stroop modifiée. Une augmentation globale des ondes thêta et alpha, ainsi qu’une diminution de l’amplitude des ondes N100 et P300 interprétées comme reflétant une baisse de l’attention ont été observées. La seconde étude a mis en évidence que l’augmentation de la perception de l’effort lors d’un exercice physique d’endurance en présence de fatigue mentale était liée à une augmentation de l’activité des aires motrices et prémotrices (lors de contractions réelles et imaginées). Dans une troisième étude, nous avons montré que les effets de la fatigue mentale persistaient dans le temps. Les performances lors d’une tâche de pointage étaient de plus en plus altérées après la tâche mentalement fatigue, et ce malgré un effet de récupération sur le niveau de fatigue mentale perçue. La quatrième étude a montré que l’utilisation de stratégies de compensation, comme l’écoute de musique agréable ou la pratique d’une activité physique durant 15 min étaient efficaces pour contrer les effets liés à la fatigue mentale et maintenir le niveau de performance motrice. Ces travaux ont montré que la fatigue mentale engendre des modifications de l’activité cérébrale au cours d’une tâche cognitivement exigeante mais également lors d’une exercice physique subséquent. De plus, le phénomène de fatigue mentale semble persister dans le temps et impacter de plus en plus nos performances. Cependant des stratégies de compensation comme l’écoute de musique ou la pratique d’une activité physique semblent efficaces pour contrecarrer ses effets délétèresMental fatigue is a common phenomenon in modern society, causing an alteration in both cognitive and physical performances. It can lead to an increased risk of accidents, a drop in productivity, and certain disorders such as depression. The objective of this thesis work was to study this phenomenon of mental fatigue by investigating more specifically its electrophysiological markers, and to find compensatory strategies to limit and/or avoid its deleterious effects.The first study identified brain activity modulations during a prolonged modified Stroop task. An increase in theta and alpha waves, as well as a decrease in N100 and P300 amplitude reflecting a decrease in attention were observed. The second study showed that the increase in the perception of effort during physical endurance exercise in the presence of mental fatigue was linked to an increase in the activity of the motor and premotor areas (during actual and imagined contractions). In a third study, we highlighted that the effects of mental fatigue were persistent over time. Performance during an arm-pointing task was increasingly impaired after the mentally fatiguing task, despite a recovery effect on the level of perceived mental fatigue. Finally, the fourth study showed that the use of compensatory strategies such as listening to pleasant music or practicing a physical activity for 15 min were effective in countering the effects of mental fatigue and maintaining the level of motor performance. This work showed that mental fatigue leads to changes in brain activity during a cognitively demanding task, and during subsequent physical exercise. Moreover, the phenomenon of mental fatigue seems to persist over time and increasingly impact performance. However, compensatory strategies such as listening to music or practicing a physical activity seem to be effective in counteracting its deleterious effects
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Frayne, Ellie. „Motor Control and Self-Regulatory Fatigue Following Facial Nerve Paralysis“. Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/16174.
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This research project addressed the question of why facial nerve paralysis patients experience fatigue during facial expression exercises and when using their face in social situations. It was proposed that attempts at consciously controlling the movement of the usually automatically controlled facial muscles deplete cognitive resources, and result in a task-specific mental fatigue comparable to the depletion observed following self-regulation efforts. A questionnaire study showed that facial exercises were as fatiguing as performing moderate gardening or heavy housework; and for patients, use of the face in a social setting was as fatiguing as walking up a steep hill for 1km, supporting the resource depletion view. Conscious control of the face for facial nerve paralysis patients may also be fatiguing due to the fine movements needed to perform facial expressions in social interactions, so an apparatus for testing sensitivity of proprioception of the orofacial muscles was developed, resulting in the first research on orofacial muscle proprioception in comparison to the jaw muscles. By using the same psychophysical task it was possible to accurately measure the proprioceptive ability of the pucker movement of the lips and for the closing movement of the jaw. The acuity of the orofacial muscles, a structure devoid of muscle spindles, was significantly better than for the jaw, an area with high proprioceptor (muscle spindle) density. Further, there was a significant correlation between the proprioceptive sensitivity scores of the lips and jaw, suggesting that proprioceptive sensitivity arises from extensive coordinated use of the lips and jaw for expression, speech and mastication. The high degree of proprioceptive ability demonstrated by the lips, as well as the correlation with the jaw highlights the unique nature of the facial muscles of expression; and implies that the face should be treated as a separate entity in terms of exercise prescription.
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Posnock, Samuel Joseph. „Individual and contextual determinants of subjective cognitive fatigue“. Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47693.
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Cognitive fatigue refers to the decline in mental efficiency and accompanying feelings of strain and weariness that occur over time-on-task. This study extends previous research on the determinants of cognitive fatigue by evaluating the independent and joint effects of individual differences in extraversion and performance context (individual vs. team) on reports of fatigue. Using a within-subjects counterbalanced design, 92 undergraduate participants performed a three-hour series of problem-solving tasks alone and as part of a four-person team. Results indicated main effects for context, such that all participants report greater fatigue in the solitary performance context compared to the team context. Extraversion was also negatively related to fatigue across time-on-task. However, no extraversion X context interaction was observed. I conclude that task engagement provides a specific source of variance in fatigue-reduction, and suggest that extraverts benefit more from task-related arousal or state positive affect.
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Wolflin, Rosemary. „Understanding overloaded adults' readiness level for learning“. Virtual Press, 1999. http://liblink.bsu.edu/uhtbin/catkey/1142403.
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The purpose of the study was to investigate adults who have excessive load or demands ("Overloaded Adults") and their readiness level for learning ("Readiness"). The study was intended to discover the relationship, if any, between Overloaded Adults' load and their Readiness, the reasons Overloaded Adults do not participate in particular educational activities, the percentages of Overloaded Adults in a range from "able and willing" to "neither able nor willing" to participate in various educational activities, the power sources Overloaded Adults identify as present or not present, and how Overloaded Adults' demographic characteristics relate to their load and Readiness.The sample in the study consisted of 60 Overloaded Adults. The researcher used a convenience sampling of available passersby walking on downtown sidewalks in four Indiana cities who were willing to stop and complete the written survey, which consisted of two parts: the Type E Stress Inventory developed by Harriet B. Braiker and a questionnaire developed by the researcher. The researcher also conducted 21 tape-recorded telephone interviews. The researcher analyzed the data using the Pearson correlation coefficient statistic and a scatter plot, tallies and percentages, observations, and interview responses incorporated into a profile and description of general themes.The researcher discovered that the majority of adults (77%) walking on downtown sidewalks on Saturdays were Overloaded Adults. Further, the researcher found, unlike McClusky's theory of margin, that there was likely no relationship between Overloaded Adults' load and Readiness and that Overloaded Adults with a surplus of power over load were not necessarily more likely to learn than Overloaded Adults with a surplus of load over power. The researcher also found 1) at least 30 inhibiting conditions or situations that shaped Overloaded Adults' perceptions of their readiness to learn, 2) Overloaded Adults were very willing and somewhat able to participate in various educational activities, 3) Overloaded Adults had numerous available sources of power, and 4) Overloaded Adults with particular demographic characteristics were at high risk for not being ready to learn. Based on these and other findings in the study, the researcher developed a Model for Understanding Overloaded Adults' Readiness Level for Learning.Department of Educational Leadership
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Hedberg, Eva-Karin, und Amanda Granberg. „Arbetsterapeuters erfarenheter av att arbeta med personer som har hjärntrötthet efter stroke“. Thesis, Umeå universitet, Avdelningen för arbetsterapi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-168720.
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I Sverige insjuknar ca 25 000 människor varje år i stroke och en vanlig konsekvens är hjärntrötthet. Det finns forskning kring hjärntrötthet men begränsad forskning om hur arbetsterapeuter arbetar med dessa individer. Syftet med studien var att beskriva arbetsterapeuters erfarenheter av att arbeta med personer som drabbats av hjärntrötthet efter stroke. Fem arbetsterapeuter intervjuades varefter intervjuerna analyserades med kvalitativ innehållsanalys. Resultatet visade att en central del i arbetet var att informera och stödja de drabbade. En viktig del i arbetet innan implementeringen utav olika strategier, var att låta personen få insikt i den nya rollen. Insikten ansågs avgörande för personens process framåt. De strategier som erbjöds syftade till att individerna skulle kunna hantera sin hjärntrötthet och uppleva en fungerande vardag. En slutsats är att anhörigas förståelse och stöd i rehabiliteringsprocessen är viktig. Arbetsterapeuter beskriver att ett klientcentrerat förhållningssätt är avgörande eftersom hjärntröttheten påverkar varje individ olika. Därför betonades att en noggrann kartläggning är av största vikt.
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Beshany, Ryan P. „Analysis of Navy flight scheduling methods using Flyawake“. Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FBeshany.pdf.
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Thesis (M.S. in Operations Research)--Naval Postgraduate School, September 2009.Thesis Advisor(s): Miller, Nita Lewis. "September 2009." Description based on title screen as viewed on November 04, 2009. Author(s) subject terms: FlyAwake, SHARP, fatigue countermeasures, performance effectiveness, sleep, shift work, continuous operations, sustained operations, ORM. Includes bibliographical references (p. 59-60). Also available in print.
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Bowen, Nikol V. „Common Characteristics of Compassionate Mental Health Counselors: A Qualitative Study“. The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275511127.
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Alroomi, Anwar S. „Influence of Remoteness Variables on Mental Health, Fatigue and Safety Behaviour among Oil and Gas Workers“. Thesis, Griffith University, 2020. http://hdl.handle.net/10072/400457.
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The oil and gas industry is considered the backbone of economic and social development in many countries in the Gulf region. Work in this industry presents dangers and challenges, as it is usually undertaken in remote locations and difficult geographical environments, resulting in a relatively high workplace accident rate. Such harsh work environments necessitate low-risk work behaviour to improve organisational safety performance. Workers’ safety behaviour is crucial if the number of occupational accidents is to be reduced.
Most oil and gas studies investigating the health and safety of workers have involved remote work environments which is potentially stressful because the workforce lives and works on-site (i.e., a single restricted location) for significant periods of time.
There is no universally recognised definition of remoteness. A remote area can be considered as isolated geographically, socially and professionally. Kuwait was selected as the location for this study, due to its strategic location in the Gulf region. Oil and gas is Kuwait’s largest industry, accounting for nearly half the country’s gross domestic product. It is worth mentioning that oil-producing corporations in the Gulf region host the largest percentage of expatriate employees, far exceeding the percentage of local employees. The bulk of workers in this industry come from diverse Asian countries. Workers are typically relocated to a remote production site in a region foreign to them. They work in these remote sites for an extended period that varies from weeks to months, occasionally lasting a year or longer. The physical isolation, combined with the isolation from family, friends and familiar surroundings represents the definition of remoteness, a central concept in this research study.
Based on the above definition of remoteness, two main concepts arise: physical isolation variables and occupational stressors. Physical isolation from family, friends and familiar surroundings and its variables were identified from studies conducted on fly-in/fly-out (FIFO) workers, migrants, university students and even elderly people. Physical isolation was represented by two independent variables: namely, social isolation and loneliness. Two occupational stressors - related to this study’s concept of remoteness – have been identified as responsibilities towards family and living environment. In sum, this study aimed to examine the effect of four remoteness variables, social isolation, loneliness, responsibilities towards family, and living environment, on workers’ mental health, fatigue and safety behaviour.
In other words, the study investigated whether the remoteness variables affect workers’ safety behaviour directly or indirectly through the mediating role of mental health and fatigue levels. Safety behaviour was represented by levels of safety compliance and safety participation. To achieve the study’s objective, a conceptual model was developed comprising the remoteness variables along with the two mediating variables and safety behaviour. These four main components are linked by 12 research hypotheses that were established according to the proposed theoretical relationships. To validate the conceptual model, a quantitative research method was adopted.
To empirically test and refine the conceptual model, a series of multivariate statistical approaches were employed to process the data, which were collected from 387 expatriate workers from an isolated oil and gas field site in Kuwait. Exploratory factor analysis was performed to uncover the smaller set of factors of the constructs. For example, mental health has two underlying factors; namely, anxiety and depression, whereas mental fatigue and physical fatigue were revealed as underlying factors of fatigue. Confirmatory factor analysis was then conducted to assess and confirm the validity of the factors derived from the exploratory factor analysis results. Multiple regression analyses were then applied to test the proposed hypotheses.
Several key findings have emerged from this study, and the remoteness variables were proven to affect safety behaviour.
1- Regarding the direct effect:
a) Physical isolation variables (social isolation and loneliness) had a direct negative influence on both types of safety behaviour (compliance and participation).
b) Occupational stressors (responsibilities towards family and living environment) had a direct negative influence on safety participation behaviour.
2- Regarding the mediating role of mental health:
a) Only anxiety mediated the relationship between loneliness and both types of safety behaviour (compliance and participation).
b) Both anxiety and depression mediated the relationship between responsibilities toward family and safety participation.
c) Both anxiety and depression mediated the relationship between living environment and safety participation.
3- Regarding the mediating role of fatigue:
a) Only mental fatigue mediated the relationship between loneliness and both types of safety behaviour (compliance and participation).
b) Both physical fatigue and mental fatigue mediated the relationship between responsibilities toward family and safety participation.
c) Both physical fatigue and mental fatigue mediated the relationship between living environment and safety participation.
The above findings provide empirical evidence in support of the key hypothesis that remoteness variables have negative effects on safety behaviour, while mental health and fatigue can act as risk factors.Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
Full Text
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Grosz, Rachael Lorraine. „EFFECTS OF EXERCISE AND MENTAL FATIGUE ON RESPONSE INHIBITION IN EXERCISE-TRAINED VERSUS SEDENTARY COLLEGE STUDENTS“. Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53737.
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The purpose of this study was to determine if fitness levels of individuals affect cognitive function. This study seeks to show how response inhibition and accuracy are affected following a mentally fatiguing task. Response inhibition refers to the suppression of actions that are inappropriate and that interfere with goal driven behavior. Response inhibition in reference to the continuous performance task (CPT) is measured in false clicks. The tasks for the CPT were completed after either a controlled period of rest or moderate-intensity exercise. Subjects were either Georgia Tech Division I track athletes or students leading a sedentary lifestyle. All subjects participated in two test protocols. Athletic subjects completed the resting protocol first, while sedentary subjects completed the exercise protocol first.
Subjects reported to the lab following an overnight fast. They completed an initial set of paper work and signed a consent form, filled out a 24 hour history form and completed a Profile of Moods States (POMS) and Visual Analog Scale (VAS) form. Subjects then took a 20-minute (CPT). The CPT is a neuropsychological test that measures an individual’s sustained and selective attention. The length of the test is 20 minutes in order to induce mental fatigue. The goal of the test is to click in a white box when the letter T is seen. Immediately after subjects filled out a secondary set of paperwork. Once paper work was complete subjects either rested or exercised for 35 minutes. If subject was classified as an athlete, trial 1 was rest, while trial 2 was exercise. If subject was classified as a sedentary student, trial 1 was exercise, and trial 2 was rest. After the subject completed either the cycling or resting portion they repeated the CPT for five minutes.
It was hypothesized that that the effects of moderate exercise positively affect the subject’s performance on the CPT. I expect false clicks following the 5 minute CPT to be lower after exercising. I hypothesize that for both groups their accuracy should be higher after moderate cycling and that higher fitness level should decrease the level of mental fatigue experienced throughout the CPT.
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Johnson, Nykia S. „Secondary Traumatic Stress, Compassion Fatigue, and Burnout: How Working In Correctional Settings Affects Mental Health Providers“. Antioch University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=antioch1477328356041575.
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Hughes, Steven. „The use of performance assessments and force-time curve analysis to measure mental and physical fatigue“. Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2023. https://ro.ecu.edu.au/theses/2643.
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As management of fatigue and recovery is a key objective of modern sport, athlete monitoring is now commonplace. With assessments such as perceptual questionnaires, countermovement jumps (CMJ), squat jumps (SJ), isometric mid-thigh pulls (IMTP), and postural sway having been used with varied success, the use of emerging analysis techniques may improve sensitivity. For example, while vertical jump assessment traditionally employs analysis of discrete individual metrics calculated from a location on the force-time curve, complete force-time curve analysis may provide greater sensitivity by retaining information commonly discarded in discrete analysis. Furthermore, with mental fatigue reportedly impairing cognitive and physical performance, identifying an objective, practical assessment of mental fatigue would provide practitioners with a more comprehensive assessment of athlete fatigue.
Study 1 investigated whether several performance assessments (perceptual questionnaire, cognitive assessment, postural sway, CMJ, SJ, IMTP) could model fatigue, improving assessment over stand-alone analysis at multiple time points. These findings supported the use of perceptual questionnaires, CMJ, SJ and maximal cycling sprints, with perceptual questionnaires and cycling sprints demonstrating impairment at 24 and 48 hr. However, when attempting to model 24 and 48 hr power outputs from metrics at earlier time points, only CMJ height explained power output.
Study 2 sought to determine whether a complete time-series analysis of biomechanical data through Statistical Parametric Mapping (SPM) could better detect fatigue than traditional discrete methods. Two-way repeated measures ANOVA was performed on relative force-time curves (SPM analysis) and peak relative force (discrete analysis) taken from the same data set with SPM analysis alone detecting fatigue.
Study 3 assessed the ability of four cognitive performance assessments and a time-series analysis of CMJ force through functional principal components analysis (fPCA), to objectively measure mental fatigue after 60 min of a mentally fatiguing task. Despite post hoc testing not reaching significance, a significant interaction effect in reaction task linear mixed model analysis (LMM) and medium effect sizes, suggested that the reaction task alone was likely impaired by 60 min of cognitive tasks. Furthermore, time-series analysis explained 95.8% of the total variation in force-time curves, with LMM analysis reporting a significant difference after mental fatigue.
Utilising performance assessment tasks, Study 4 explored mental and physical fatigue responses across four conditions consisting of varying distributions of physical and cognitive loads: futsal (physical+cognitive), workload-matched treadmill session (physical), timematched soccer video gameplay (cognitive) and a control. The findings indicate that perceptual questionnaires and SJ were impaired by physical workloads of match play and treadmill sessions, while CMJ was impaired by match play but not treadmill fatigue. No significant differences were observed in IMTP or reaction tasks in any condition. This research suggests that reaction tasks were ineffective at measuring mental fatigue after sporting competition and video gameplay.
This thesis supports perceptual feedback and jump testing for subjective and objective assessment of both physical and mental fatigue. Furthermore, discrete and time-series jump analysis can be used to assess specific performance outcomes or execution of movements. Finally, the cognitive reaction task likely provides an objective measure of severe mental fatigue with the brevity of the aforementioned assessments promoting practicality in sports.
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Nguyen, Chau. „Spirituality, Mindfulness, and Art-Making in Mitigating Compassion Fatigue“. Digital Commons at Loyola Marymount University and Loyola Law School, 2019. https://digitalcommons.lmu.edu/etd/774.
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This study is an art exploration of the combined use of mindfulness practice, cultivated through a body-scan meditation, and art-making in mitigating compassion fatigue for a beginning clinician. The researcher used an arts-based inquiry with a quantitative component in her data collection and analysis. A reliable, evidenced-based test was self-administered at the beginning and end of the data collection to measure compassion fatigue and compassion satisfaction. The arts-based inquiry included the researcher engaging in a body-scan meditation, journaling, and art-making over a period of four weeks as methods to process the relationship between mindfulness practice, art-making practice, and compassion fatigue in her clinical work at a community based mental health agency. The body-scan meditation provided insight into the clinician’s experiences and conceptual understandings. Journaling provided a tool for reflection and analysis of the researcher’s engagement in mindfulness and art-making. The art-making process offered a more in-depth understanding of the researcher’s application of mindfulness, as a tool, in clinical practice with her clients. The One-Canvas Process Painting can be utilized as a tool to reflect the researcher’s transformative learning process about her countertransference with clients. The data analysis in this study indicates that engaging in mindfulness practice and art-making practice can increase a beginning clinician’s compassion satisfaction within her clinical work.
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Guess, Gloria Michelle. „Relationship Between Cancer-Related Fatigue and Depression: A Pilot Study“. Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3132.
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Abstract
Fatigue is one of the most bothersome symptoms reported by patients diagnosed with cancer, and research indicates that the majority of patients receiving chemotherapy report symptoms of fatigue. Fatigue can have an effect on quality of life; therefore, it is essential that healthcare providers gain a better understanding and recognition of fatigue.
Fatigue can also be a symptom of depression. Depression is another prominent symptom reported by patients diagnosed with cancer. Unfortunately, there are similarities between the symptoms of depression and fatigue making it difficult for health care providers to distinguish between the two. This study utilizes the subscale of the Hospital Anxiety and Depression Scale and the Multidimensional Fatigue Scale-Short Form to further investigate the relationship between cancer-related fatigue and depression.
The convenience sample consisted of 30 chemotherapy patients being treated at an outpatient infusion center in a comprehensive cancer center in southwest Florida. All participants were between the ages of 26 and 74, and had been receiving chemotherapy for a minimum of three weeks; none had been diagnosed with chronic fatigue syndrome, or were currently being treated with radiation.
The participants in the study self-rated their fatigue on a Likert-type scale of 0-10. The mean score on the self-rated fatigue scale was 4.03 (SD= 2.76). This study supports prior studies in which chemotherapy patients report mild to severe levels of fatigue.
The mean score on the depression subscale of the Hospital Anxiety and Depression subscale was 4.53 (SD=4.2). A statistically significant correlation was noted between cancer-related fatigue and depression, utilizing the Hospital Anxiety and Depression subscale score and Multidimensional Fatigue Inventory-Short Form total scores (r=.676, p=.000).
This study provides evidence that tools such as the Hospital Anxiety and Depression Scale and the Multidimensional Fatigue Inventory-Short Form can aid researchers and providers in distinguishing between fatigue and depression. Using these instruments in future research and practice may help avoid the overlap in symptoms of fatigue and depression.
These study results support findings from previous studies indicating a moderate correlation between cancer-related fatigue and depression. This study addresses the correlation between cancer-related fatigue and depression in chemotherapy patients which may improve nursing assessment of fatigue and depression in this population. Findings suggest the need for ongoing research focusing on cancer-related fatigue and depression as well as appropriate pharmacological and non-pharmacological interventions to improve the quality of life of this patient population.
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Llewellyn, Heidi A. „An Exploratory Study of the Relationship between Compassion Fatigue and Empathy in Professional Counselors“. Ohio University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1255965589.
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Maegli, Marta Maria. „Impact of an appreciative inquiry intervention on compassion fatigue among social service workers“. Thesis, Pepperdine University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1571609.
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This action research study examined the impact of participation in an appreciative inquiry (AI) intervention on social service workers' level of compassion fatigue. Five workers plus two of their managers took part in the study. A 6-hour AI intervention was held and participants completed pre- and post-tests of the Professional Quality of Life Scale to measure their compassion satisfaction, compassion fatigue, and burnout. A focus group also was held to gather qualitative data about the impact of the intervention. Results indicated that the intervention was highly valuable for strengthening working relationships, underscoring the positives in otherwise emotionally difficult work, and learning how to avoid or reduce compassion fatigue. Based on these findings, periodic AI interventions are advised to reduce social service workers' compassion fatigue by sharing their experiences and focusing on the positive. Future research should eliminate the limitations of the present study by expanding the sample and gathering multiple forms of data.
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Vermilyea, Elizabeth G. „Trauma-informed training and clinical supervision as moderators of compassion fatigue, when controlling for burnout and a personal history of trauma“. Thesis, Capella University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3622830.
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The purpose of this dissertation was to explore whether training and clinical supervision were predictive of compassion fatigue when controlling for burnout and personal history of trauma. The study used quantitative methodology to analyze the relationships among the predictor variables training, clinical supervision, burnout, and personal history of trauma and the criterion variable, compassion fatigue as measured by compassion satisfaction and secondary traumatic stress. The sample was 217 mental health care providers serving traumatized persons in Washington State, Wisconsin, Michigan, New York, and Maryland. Participants completed the ProQol and endorsed one of three levels of training (no trauma-specific training, some trauma-specific training or trauma certificate training), whether or not they receive clinical supervision, and whether or not they have a personal history of trauma. Sequential multiple linear regression analyses were used to assess whether the predictor variables predicted compassion fatigue. A multiple regression with interaction terms was performed to assess whether clinical supervision moderated the association between training and compassion satisfaction. The results show that, burnout was the best predictor of both secondary traumatic stress (t(215) = 13.60, p < .001) and compassion satisfaction (t(215) = -15.51, p < .001). Neither training nor clinical supervision were significant predictors of secondary traumatic stress when controlling for burnout and personal history of trauma. Training was a significant predictor of compassion satisfaction. However, clinical supervision was not a unique predictor of compassion satisfaction. None of the interaction terms were significant predictors of either secondary traumatic stress or compassion satisfaction.
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Ekstedt, Mirjam. „Burnout and sleep /“. Stockholm, 2005. http://diss.kib.ki.se/2005/91-7140-466-X/.
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Lindh, Caroline, und Veronica Persson. „En litteraturöversikt om arbetsterapeutiska strategier vid hjärntrötthet efter stroke samt personers erfarenheter av hjärntrötthet efter stroke“. Thesis, Luleå tekniska universitet, Institutionen för hälsa, lärande och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86090.
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Bakgrund: Hjärntrötthet är en vanlig konsekvens efter stroke. Hjärntrötthet innebär att personen är mentalt trött och hjärnan orkar inte processa flera saker samtidigt vilket påverkar personens vardag. Hjärntröttheten kan beskrivas som en dold funktionsnedsättning och det kan vara svårt för personen samt omgivningen att förstå hjärntröttheten. Med hjälp av arbetsterapeutiska strategier så kan personer med hjärntrötthet lära sig att hantera sin trötthet och skapa en meningsfull fungerande vardag. Syfte: Syftet var att beskriva erfarenheter av att leva med hjärntrötthet efter stroke samt arbetsterapeutiska strategier som underlättar vardagen för personer som lever med hjärntrötthet efter stroke. Metod: En litteraturöversikt valdes som metod. Datainsamlingen gjordes i fem databaser som innehöll vetenskapliga artiklar om medicin och hälsa. Åtta kvalitativa studier och en RCT-studie inkluderades efter inklusionskriterierna och kvalitetsgranskningen. Studierna analyserades i fyra steg och analysen resulterade i fyra kategorier. Resultat: Artiklarna kommer från olika länder, publicerade mellan 2008 och 2021 och samtliga deltagare var över 18 år. Analysen resulterade i fyra kategorier: Erfarenhet av hjärntrötthet, Vila och återhämtning, Anpassad miljö och Val av aktiviteter. Resultatet visade att deltagarna hade svårt att hantera vardagen och hjärntröttheten påverkade aktivitetsutförandet. Flera deltagare upplevde oro och rädsla för att drabbas av en ny stroke i framtiden. Slutats: Resultatet visade att personer som lever med hjärntrötthet upplevde svårigheter med att hantera vardagen och det påverkade personernas aktivitetsutförande samt deltagandet i sociala interaktioner. Flera av deltagarna i de granskade studierna uppgav att hjärntröttheten inte gick att vila bort och att det var svårt att veta när hjärntröttheten uppstod. Vidare så upplevde deltagarna att miljön påverkade hjärntröttheten både positivt och negativt beroende på vilken miljö de befann sig i. Litteraturöversikten visade att det fanns begränsad forskning om arbetsterapi och rehabilitering för personer med hjärntrötthet efter stroke. Arbetsterapeuterna hade en viktig roll i rehabiliteringen för att lära ut olika strategier för att hantera hjärntröttheten.Background: Mental fatigue is a common consequence after a stroke. Mental fatigue implies that the person is mentally tired and the brain is not able to process several things at the same time, which affects the person's everyday life. Mental fatigue can be described as a hidden dysfunction and it could be difficult for the person and the surroundings to understand the mental fatigue. Strategies from occupational therapists can support people with mental fatigue to manage their fatigue and create a meaningful and functioning everyday life. Purpose: The purpose of the literature review was to describe experiences of living with mental fatigue after a stroke and occupational therapy strategies that make everyday life easier for people living with mental fatigue after a stroke. Method: A literature review was chosen as a method. The data collection was done in five databases that contained scientific articles in medicine and health. Eight qualitative studies and one RCT study were included according to the inclusion criteria and the quality review. The studies were analyzed in four steps and the analysis resulted in four categories. Results: The articles come from different countries, published between 2008 and 2021 and all participants were over 18 years old. The analysis resulted in four categories: Experience of mental fatigue, Rest and recovery, Adapted environment and Choice of activities. The participants had difficulty coping with everyday life and the mental fatigue affected the activity performance. Several participants experienced anxiety and fear of suffering a new stroke in the future. Conclusion: The results showed that people living with mental fatigue had difficulty managing everyday life and it affected people’s activity performance as well as participation in social interactions. Several participants in the studies stated that the mental fatigue could not be rested and that it was difficult to know when the mental fatigue occurred. Furthermore, the participants experienced that the environment affected mental fatigue both positively and negatively depending on the environment they were in. The literature review showed that there was limited research on occupational therapy and rehabilitation for people with mental fatigue after stroke. Occupational therapists had an important role in rehabilitation to educate different strategies for managing mental fatigue.
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Bojan, Steta, und Lundeberg Sofia. „Arbetsterapeuters erfarenheter av interventioner för individer med hjärntrötthet : En kvalitativ studie“. Thesis, Högskolan i Jönköping, Hälsohögskolan, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-36205.
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Introduktion: Tidigare forskning tyder på att hjärntrötthet är ett komplext tillstånd som negativt påverkar individens livssituation och kan skapa obalans i vardagliga aktiviteter. Syfte: Att beskriva arbetsterapeuters erfarenheter av interventioner för individer med hjärntrötthet. Metod: En kvalitativ design valdes för att besvara studiens syfte. Avsiktligt urval användes för att utse tio arbetsterapeuter med erfarenhet inom området. Data samlades in med hjälp av semistrukturerade intervjuer med öppna intervjufrågor. Innehållsanalys genomfördes på de transkriberade intervjuerna, vilket resulterade i ett tema, tre kategorier samt sju underkategorier. Resultat: Resultatet sammanfattades i temat ”Arbetsterapeuten som coach med individen i fokus”. Kategorierna som framkom var; Information och rådgivning: vikten av att informera patienter och anhöriga om innebörden av hjärntrötthet samt nyttan med interaktion där arbetsterapeuten agerade coach och patienten gavs möjlighet att reflektera. Strategier: genom exempelvis identifiering, planering och struktur av aktivitetsmönster erbjöds patienten hantering av hjärntröttheten och kunde därmed bättre klara sin vardag. Hjälpmedel: individanpassade hjälpmedel av olika slag kunde underlätta i patientens vardag. Slutsatser: Det fanns inte några färdiga interventioner för patienter med hjärntrötthet utan åtgärderna behövde anpassas för varje specifik individ. Genom coachning, strategier och hjälpmedel kunde patienterna lära sig att hantera sin hjärntrötthet och få vardagen att fungera.Introduction: Previous researches indicate that mental fatigue is a complex condition that adversely affects the individual's life situation and can cause imbalance in everyday activities. Aim: To describe occupational therapists' experiences of interventions for individuals with mental fatigue. Method: A qualitative design was chosen to answer the purpose of this study. Target selection was used to elect ten occupational therapists with experience in the field. Data was collected using semi-structured interviews with open interview questions. Content analysis was conducted on the transcribed interviews, resulting in one theme, three categories and seven subcategories. Result: The result was summarized in a theme: Occupational therapist as a coach with focus on the individual. The categories were; Information and counseling: the importance of informing patients and relatives about mental fatigue as well as the benefit of interaction. Strategies: further interventions were enabled through patients identifying and acquiring insight of his or her own situation. Assistive devices: individualized assistive devices could support the patient's everyday life. Conclusions: Results showed that there were no ready-made interventions for patients with mental fatigue and that the interventions had to be individualized for each specific individual. The purpose of the interventions was to teach patients to deal with their mental fatigue and
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Hogue, Cheryl. „The effects of fatigue and depression on quality of life in radiation oncology patients“. Virtual Press, 2000. http://liblink.bsu.edu/uhtbin/catkey/1179133.
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The use of quality of life instruments to evaluate the effects of cancer and its treatments on patients has increased, but understanding the roles that fatigue and depression play on quality of life is still complicated. Earlier studies have examined the individual effects on the quality of life of cancer patients. The purpose of this study was to investigate whether gender is related to the effects of fatigue and depression on quality of life. This study also examined the interactional effects of fatigue and depression on quality of life. The current study found no significant differences on reports of quality of life between genders. Additionally, this study found that depression and fatigue were moderately correlated. Depression and fatigue were also found to account for a proportion of the variance in the quality of life domains of physical, functional, and emotional wellbeing. However, the interaction effects were minimal, but were significant predictors of total quality of life in females, but not male, cancer patients.Department of Counseling Psychology and Guidance Services
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Flensner, Gullvi. „Fatigue in individuals with multiple sclerosis : lived experiences and perceived impact in daily life /“. Linköping : Linköpings universitet, 2005. http://www.bibl.liu.se/liupubl/disp/disp2005/med917s.pdf.
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Sunshine, Megan. „An empirical investigation into task aversion“. Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1006085.
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Aversion is a complex phenomenon that arises over time through performance of cognitively demanding tasks and has been associated with the mechanisms of mental fatigue and compensatory control. However, little is known about this sensation to dissociate from the task at hand and the causation thereof. It is apparent that aversion is a negative state for the operator and could result in decreased performance and productivity. Through identification of factors that contribute to aversion when performing cognitively demanding tasks, recommendations to reduce design deficits may be employed to promote worker wellbeing and further advance performance and productivity. The current study examined possible factors that may influence aversion experienced through execution of cognitive tasks. A subsequent aim of this study was to assess a possible cause of aversion. The cause of aversion was hypothesized to be related to efficiency, namely the perception of efficiency when performing tasks and actual efficiency calculated through performance of tasks in relation to the expenditure of effort. Four investigations were undertaken with a non-repeated design between investigations and a repeated design within investigations. The first investigation was an analysis of the effect that stimulus cycling had on the aversion experienced. This consisted of a proof reading task with two conditions varying in the repetitiveness of the text, therefore, allowing an analysis as to how aversion is altered by the provision of a new stimulus to the participants. Investigation two investigated the effect that task difficulty imposed on aversion experienced. This comprised of two conditions with varied difficulty that were implemented through a driving simulator tracking task with difficulty altered by the width of the driving lane. The effect of performance feedback on the aversion experienced towards a task was the focus of the third investigation. The effect on aversion experienced was assessed through a driving simulator tracking task with a condition providing feedback of performance to participants and a condition with no knowledge of performance. The final experiment evaluated the effect of task alternations on aversion. This experiment was conducted through alternations between a driving simulator tracking task and a choice reaction task. The choice reaction tasks required participants to identify critical and non-critical stimulus. Four conditions were required for this experiment and were made up of two conditions where there was provision of alternation that varied in frequencies between the two tasks (medium alternation condition and fast alternation condition) and two conditions where no alternations were instated (driving simulator task condition and choice reaction task condition). Separations between all testing conditions were three or more days apart with sixty participants distributed between the investigations. Test duration of each condition was 30 minutes. Subjective data was recorded throughout investigations for all conditions in the form of aversion, subjectively perceived efficiency and rate of perceived exertion. Objective data was collected in the form of physiological responses and performance of tasks for the analysis of objective efficiency. For factors influencing aversion analysis, no differences in aversion experienced were found for the task difficulty and performance feedback investigations. Aversion was found to be less for the changes imposed through the task cycles and task alternation investigations. This concludes that aversion is aggravated through monotonous tasks and by a change of the stimulus or the structure of the cognitive tasks provided to operators; aversion can be alleviated. The results for the cause of aversion analysis found no difference in objective efficiency over time, with a subsequent decrease in perceived efficiency associated with the increasing aversion. Inference from these findings suggest that aversion cannot be attributed to objective inefficiency of task performance, however it can further be assumed that perception of actual efficiency is inaccurate. Perception of efficiency however had a large influence on the sensation of aversion. Aversion is seen to be more of a product of time on task, however whether this is mechanism of fatigue or compensatory control is still to be determined.
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Wahab, Mejda. „Modélisation des interactions bidirectionnelles entre les processus cognitifs et l'addiction chez le rat“. Thesis, Poitiers, 2018. http://www.theses.fr/2018POIT2259.
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L’addiction aux drogues est une pathologie psychiatrique chronique qui se caractérise par une prise et une recherche compulsive de drogue malgré des conséquences négatives. Ces dernières années il a été établi que les processus cognitifs (impulsivité, flexibilité comportementale, mémoire de travail, …) jouent un rôle majeur dans cette pathologie. En effet, d’un côté la présence de déficits cognitifs semble être un facteur favorisant le développement et la mise en place de l’addiction, et de l’autre la consommation répétée de drogue induirait des déficits cognitifs. L’objectif de ce travail de thèse a consisté en l’étude des interactions bidirectionnelles existantes entre l’addiction et les processus cognitifs. Dans la première partie de ce travail, nous nous sommes intéressés à la mise en place d’une nouvelle procédure d’étude de l’impulsivité de choix chez le rat permettant d’améliorer les procédures de Delay Discounting déjà existantes. Notre procédure peut représenter un nouvel outil permettant de faciliter la compréhension des processus neurobiologiques sous-jacents à la prise de décision et les conséquences de la prise de drogue sur celle-ci. La seconde partie de ce travail a consisté en l’étude des effets d’un exercice cognitif sur le comportement d’auto-administration de cocaïne chez le rat. De façon surprenante, nous avons mis en évidence que la pratique d’un effort cognitif avant une session d’auto-administration de cocaïne augmente la consommation de drogue. Ainsi, il semblerait que chez le rat comme chez l’Homme, l’effort cognitif peut induire l’apparition d’une « fatigue mentale » ayant des effets néfastes sur l’addictionDrug addiction is a chronic psychiatric disorder characterized by compulsive drug seeking and drug taking in spite of negative consequences. In the last years, it has been clearly shown that cognitive processes (impulsivity, behavioral flexibility, working memory, etc.) play a major role in this disorder. In fact, on the one hand, cognitive deficits appear to be risk factors for the development and maintenance of addiction and, on the other hand, repeated drug taking induces cognitive deficits. The objective of this thesis has been to investigate the bidirectional interactions between addiction and cognitive processes. In the first part of this work, we have been worked at developing a new procedure to study choice impulsivity in rats allowing improving existing Delay Discounting procedures. Our procedure could represent a new tool to gain insights into neurobiological processes underlying decision-making and the consequences of drugs on it. The second part of my thesis has consisted in investigating the effects of cognitive exercise on cocaine self-administration in rats. Surprisingly, we found that making a cognitive effort before a cocaine self-administration session increases drug consumption. Therefore, it appears that similarly to what described in humans, in rats, cognitive effort could induce a sort of “mental fatigue” that has negative effects on addiction
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Arnau, Stefan [Verfasser], Edmund [Gutachter] Wascher und Onur [Gutachter] Güntürkün. „Electrophysiological correlates of mental fatigue and the nature of cognitive resources / Stefan Arnau ; Gutachter: Edmund Wascher, Onur Güntürkün ; Fakultät für Psychologie“. Bochum : Ruhr-Universität Bochum, 2019. http://d-nb.info/1182682537/34.
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Alberts, Terri Lynn. „Chronic fatigue and immune dysfunction syndrome: its relationship to underlying emotional and psychological issues“. CSUSB ScholarWorks, 1997. https://scholarworks.lib.csusb.edu/etd-project/1181.
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This post-positivist research study explored the possible relationship between Chronic Fatigue and Immune Dysfunction Syndrome (CFIDS) and the presence of underlying psychological and emotional issues. An exploratory design with naturalistic methods of inquiry was utilized to investigate whether the presence, or absence, of these issues had any impact on the overall disease process.