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Buunk, A. M., F. F. Siebenga, M. C. A. Kramer, F. Gelens, F. Gelmers, S. E. Rakers, I. Bosma, et al. "P01.08.B MENTAL FATIGUE IN PATIENTS WITH LOW-GRADE GLIOMA: ASSOCIATIONS WITH NEUROCOGNITIVE FUNCTIONING AND TUMOR CHARACTERISTICS." Neuro-Oncology 25, Supplement_2 (September 1, 2023): ii27—ii28. http://dx.doi.org/10.1093/neuonc/noad137.082.
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Abstract BACKGROUND Fatigue is a frequent consequence of low-grade glioma (LGG), but the causes are still barely understood. Specifically mental fatigue might be related to cognitive impairment such as mental slowness and decreased attention. Also, patients with greater tumor volumes or tumors in certain locations (such as the frontal cortex) might have more cognitive impairments and experience more fatigue. The aim of the present study was twofold: (1) to examine the relationship between mental fatigue and information processing speed and complex attention and (2) to investigate the associations between mental fatigue and tumor volume and location in patients with LGG. MATERIAL AND METHODS 124 patients with LGG (IDH mutated astrocytoma and oligodendroglioma grade 2 and 3) were included before the start of proton therapy. Different facets of fatigue, including mental fatigue, were measured after surgery, with a multidimensional fatigue scale, the Dutch Multifactor Fatigue Scale (DMFS). The Vienna Test System was used to examine simple information processing speed, response inhibition, and divided attention. Tumor location and tumor volume (radiation target volume) were scored on the pre-radiotherapy MRI scan. Descriptive statistics, Spearman’s correlations, and between group comparisons were performed. RESULTS 41% of patients with LGG reported severe mental fatigue. No significant differences were found in mean performance on simple information processing speed, response inhibition and divided attention between severely mental fatigued patients and non-severely mental fatigued patients. However, the percentage of patients with impaired divided attention was significantly higher in the severely mental fatigued group (39%) compared to the non-severely mental fatigued group (16.2%), χ2 = 7.6, p < 0.05. No significant relationships were found between mental fatigue and tumor volume and location. Also, tumor location was not related to neurocognitive functioning, but larger tumor volume was significantly associated with poorer performance on divided attention (r = -0.19, p < 0.05). CONCLUSION A high rate of mental fatigue was found in patients with LGG. Furthermore, a relationship between impaired divided attention and severe mental fatigue was found. This implies that patients may develop mental fatigue due to increased cognitive efforts to compensate for attentional deficits. This might be especially important in patients with larger tumors, considering the relationship between tumor volume and divided attention. The results stress the importance of neuropsychological assessment in this patient group before the start of adjuvant treatment, to timely offer individual rehabilitation.
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Vargovics, Marina, and Árpád Csathó. "The multidimensional nature of fatigue." Mentálhigiéné és Pszichoszomatika 10, no. 3 (September 2009): 181–207. http://dx.doi.org/10.1556/mental.10.2009.3.1.
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Marcora, Samuele M., Walter Staiano, and Victoria Manning. "Mental fatigue impairs physical performance in humans." Journal of Applied Physiology 106, no. 3 (March 2009): 857–64. http://dx.doi.org/10.1152/japplphysiol.91324.2008.
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Mental fatigue is a psychobiological state caused by prolonged periods of demanding cognitive activity. Although the impact of mental fatigue on cognitive and skilled performance is well known, its effect on physical performance has not been thoroughly investigated. In this randomized crossover study, 16 subjects cycled to exhaustion at 80% of their peak power output after 90 min of a demanding cognitive task (mental fatigue) or 90 min of watching emotionally neutral documentaries (control). After experimental treatment, a mood questionnaire revealed a state of mental fatigue ( P = 0.005) that significantly reduced time to exhaustion (640 ± 316 s) compared with the control condition (754 ± 339 s) ( P = 0.003). This negative effect was not mediated by cardiorespiratory and musculoenergetic factors as physiological responses to intense exercise remained largely unaffected. Self-reported success and intrinsic motivation related to the physical task were also unaffected by prior cognitive activity. However, mentally fatigued subjects rated perception of effort during exercise to be significantly higher compared with the control condition ( P = 0.007). As ratings of perceived exertion increased similarly over time in both conditions ( P < 0.001), mentally fatigued subjects reached their maximal level of perceived exertion and disengaged from the physical task earlier than in the control condition. In conclusion, our study provides experimental evidence that mental fatigue limits exercise tolerance in humans through higher perception of effort rather than cardiorespiratory and musculoenergetic mechanisms. Future research in this area should investigate the common neurocognitive resources shared by physical and mental activity.
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Brietzke, Cayque, Paulo Estevão Franco-Alvarenga, Raul Canestri, Márcio Fagundes Goethel, Ítalo Vínicius, Vitor de Salles Painelli, Tony Meireles Santos, Florentina Johanna Hettinga, and Flávio Oliveira Pires. "Carbohydrate Mouth Rinse Mitigates Mental Fatigue Effects on Maximal Incremental Test Performance, but Not in Cortical Alterations." Brain Sciences 10, no. 8 (July 29, 2020): 493. http://dx.doi.org/10.3390/brainsci10080493.
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Detrimental mental fatigue effects on exercise performance have been documented in constant workload and time trial exercises, but effects on a maximal incremental test (MIT) remain poorly investigated. Mental fatigue-reduced exercise performance is related to an increased effort sensation, likely due to a reduced prefrontal cortex (PFC) activation and inhibited spontaneous behavior. Interestingly, only a few studies verified if centrally active compounds may mitigate such effects. For example, carbohydrate (CHO) mouth rinse potentiates exercise performance and reduces effort sensation, likely through its effects on PFC activation. However, it is unknown if this centrally mediated effect of CHO mouth rinse may mitigate mental fatigue-reduced exercise performance. After a proof-of-principle study, showing a mental fatigue-reduced MIT performance, we observed that CHO mouth rinse mitigated MIT performance reductions in mentally fatigued cyclists, regardless of PFC alterations. When compared to placebo, mentally fatigued cyclists improved MIT performance by 2.24–2.33% when rinsing their mouth with CHO during MIT. However, PFC and motor cortex activation during MIT in both CHO and placebo mouth rinses were greater than in mental fatigue. Results showed that CHO mouth rinse mitigated the mental fatigue-reduced MIT performance, but challenged the role of CHO mouth rinse on PFC and motor cortex activation.
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Torres, Carlos Cesar Cortes, Kota Sampei, and Norihisa Miki. "2A1-H08 Unobtrusive eye-tracker optical sensor to assess mental fatigue : Assess mental fatigue by using NASA TLX protocol." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2015 (2015): _2A1—H08_1—_2A1—H08_2. http://dx.doi.org/10.1299/jsmermd.2015._2a1-h08_1.
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Tsai, Ming-Kuan. "Enhancing nuclear power plant safety via on-site mental fatigue management." Nuclear Technology and Radiation Protection 32, no. 1 (2017): 109–14. http://dx.doi.org/10.2298/ntrp1701109t.
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Nuclear incidents and accidents have occurred at various nuclear power plants. Since some of these incidents and accidents caused by human errors might be preventable, numerous researchers argue that fatigue management for on-site workers is the key, especially for mental fatigue. Thus, this study proposes an approach consisting of two mechanisms. A fatigue monitor could identify the mentally fatigued workers by detecting their brain wave rhythms through a brain-computer interface. For such workers, a fatigue alert would awaken them. If the status of the mentally fatigued workers becomes worse, based on a positioning technique (i.e., wireless networks), this mechanism would alert the nearby workers and managers to deal with this condition. The test results indicate that the proposed approach enhanced the capacity to examine the mentally fatigued workers, ensured the accuracy in locating these workers, and avoided possible nuclear incidents. This study is a useful reference for similar applications in the nuclear industry.
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Kunasegaran, Kaveena, Ahamed Miflah Hussain Ismail, Shamala Ramasamy, Justin Vijay Gnanou, Brinnell Annette Caszo, and Po Ling Chen. "Understanding mental fatigue and its detection: a comparative analysis of assessments and tools." PeerJ 11 (August 23, 2023): e15744. http://dx.doi.org/10.7717/peerj.15744.
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Mental fatigue has shown to be one of the root causes of decreased productivity and overall cognitive performance, by decreasing an individual’s ability to inhibit responses, process information and concentrate. The effects of mental fatigue have led to occupational errors and motorway accidents. Early detection of mental fatigue can prevent the escalation of symptoms that may lead to chronic fatigue syndrome and other disorders. To date, in clinical settings, the assessment of mental fatigue and stress is done through self-reported questionnaires. The validity of these questionnaires is questionable, as they are highly subjective measurement tools and are not immune to response biases. This review examines the wider presence of mental fatigue in the general population and critically compares its various detection techniques (i.e., self-reporting questionnaires, heart rate variability, salivary cortisol levels, electroencephalogram, and saccadic eye movements). The ability of these detection tools to assess inhibition responses (which are sensitive enough to be manifested in a fatigue state) is specifically evaluated for a reliable marker in identifying mentally fatigued individuals. In laboratory settings, antisaccade tasks have been long used to assess inhibitory control and this technique can potentially serve as the most promising assessment tool to objectively detect mental fatigue. However, more studies need to be conducted in the future to validate and correlate this assessment with other existing measures of mental fatigue detection. This review is intended for, but not limited to, mental health professionals, digital health scientists, vision researchers, and behavioral scientists.
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Khojasteh Moghani, Milad, Rasool Zeidabadi, Mohammad Reza Shahabi Kaseb, and Iman Bahreini Borujeni. "Mental Fatigue Reduces the Benefits of Self-Controlled Feedback on Learning a Force Production Task." Perceptual and Motor Skills 128, no. 5 (August 2, 2021): 2398–414. http://dx.doi.org/10.1177/00315125211037306.
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This study investigated the impact of mental fatigue and self-controlled versus yoked feedback on learning a force production task. We randomly assigned 44 non-athlete male students (Mage = 21.4, SD = 1.4 years) to four groups; (a) MF&SCF = mental fatigue & self-controlled feedback, (b) MF&Y = mental fatigue & yoked, (c) NMF&SCF = no mental fatigue & self-controlled feedback, and (d) NMF&Y = no mental fatigue & yoked). SCF group participants were provided feedback whenever they requested it, while YK group participants received feedback according to a schedule created by their SCF counterparts. To induce mental fatigue, participants performed a Stroop color-word task for one hour. During the acquisition (practice) phase, participants were asked to produce a given percentage of their maximum force (20%) in 12 blocks of six trials. We recorded the participants’ absolute error at the end of the acquisition phase, the immediate retention test, the first transfer test, and the second transfer test (after 24 hours and without any further mental fatigue). The acquisition phase data were analyzed in a 2 (feedback) × 2 (mental fatigue) × 12 (block) ANOVA with repeated measures on the last factor, while the retention and transfer data were analyzed in 2 (feedback) × 2 (mental fatigue) ANOVAs. We found that all four groups made significant progress during practice ( p < .001), but there were no significant group differences during this phase ( p>.05). There was a significant interaction effect of self-controlled feedback and mental fatigue at retention ( p = .018) and transfer testing ( p < .001). In the mental fatigue condition, participants in the self-controlled group had poorer learning compared to participants in the yoked group; but when not mentally fatigued, participants in the self-controlled group had better learning than those in the yoked group. These findings suggest that mental fatigue reduces typical advantages of self-controlled feedback in motor learning.
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Paolillo, Emily W., Bin Tang, Colin A. Depp, Alexandra S. Rooney, Florin Vaida, Christopher N. Kaufmann, Brent T. Mausbach, David J. Moore, and Raeanne C. Moore. "Temporal Associations Between Social Activity and Mood, Fatigue, and Pain in Older Adults With HIV: An Ecological Momentary Assessment Study." JMIR Mental Health 5, no. 2 (May 14, 2018): e38. http://dx.doi.org/10.2196/mental.9802.
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Background Social isolation is associated with an increased risk for mental and physical health problems, especially among older persons living with HIV (PLWH). Thus, there is a need to better understand real-time temporal associations between social activity and mood- and health-related factors in this population to inform possible future interventions. Objective This study aims to examine real-time relationships between social activity and mood, fatigue, and pain in a sample of older PLWH. Methods A total of 20 older PLWH, recruited from the University of California, San Diego HIV Neurobehavioral Research Program in 2016, completed smartphone-based ecological momentary assessment (EMA) surveys 5 times per day for 1 week. Participants reported their current social activity (alone vs not alone and number of social interactions) and levels of mood (sadness, happiness, and stress), fatigue, and pain. Mixed-effects regression models were used to analyze concurrent and lagged associations among social activity, mood, fatigue, and pain. Results Participants (mean age 58.8, SD 4.3 years) reported being alone 63% of the time, on average, (SD 31.5%) during waking hours. Being alone was related to lower concurrent happiness (beta=−.300; 95% CI −.525 to −.079; P=.008). In lagged analyses, social activity predicted higher levels of fatigue later in the day (beta=−1.089; 95% CI −1.780 to −0.396; P=.002), and higher pain levels predicted being alone in the morning with a reduced likelihood of being alone as the day progressed (odds ratio 0.945, 95% CI 0.901-0.992; P=.02). Conclusions The use of EMA elucidated a high rate of time spent alone among older PLWH. Promoting social activity despite the presence of pain or fatigue may improve happiness and psychological well-being in this population.
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Ding, Cong, Soh Kim Geok, He Sun, Samsilah Roslan, Shudian Cao, and Yue Zhao. "Does music counteract mental fatigue? A systematic review." PLOS ONE 20, no. 1 (January 3, 2025): e0316252. https://doi.org/10.1371/journal.pone.0316252.
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Introduction Mental fatigue, a psychobiological state induced by prolonged and sustained cognitive tasks, impairs both cognitive and physical performance. Several studies have investigated strategies to counteract mental fatigue. However, potential health risks and contextual restrictions often limit these strategies, which hinder their practical application. Due to its noninvasive and portable nature, music has been proposed as a promising strategy to counteract mental fatigue. However, the effects of music on performance decrements vary with different music styles. Synthesizing studies that systematically report music style and its impact on counteracting performance decrements is crucial for theoretical and practical applications. Objectives This review aims to provide a comprehensive systematic analysis of different music styles in counteracting mental fatigue and their effects on performance decrements induced by mental fatigue. Additionally, the mechanisms by which music counteracts mental fatigue will be discussed. Methods A comprehensive search was conducted across five databases—Web of Science, PubMed, SCOPUS, SPORTDiscus via EBSCOhost, and the Psychological and Behavioral Sciences Collection via EBSCOhost—up to November 18, 2023. The selected studies focused solely on music interventions, with outcomes including subjective feelings of mental fatigue, physiological markers, and both cognitive and behavioral performance. Results Nine studies met the predetermined criteria for inclusion in this review. The types of music interventions that counteract mental fatigue include relaxing, exciting, and personal preference music, all of which were associated with decreased subjective feelings of mental fatigue and changes in objective physiological markers. Cognitive performance, particularly in inhibition and working memory tasks impaired by mental fatigue, was countered by both relaxing and exciting music. Exciting music was found to decrease reaction time more effectively than relaxing music in working memory tasks. The physiological marker of steady-state visually evoked potential-based brain-computer interface (SSVEP-BCI) amplitude increased, confirming that exciting music counteracts mental fatigue more effectively than relaxing music. Behavioral performance in tasks such as arm-pointing, the Yo-Yo intermittent test, and the 5 km time-trial, which were impaired by mental fatigue, were counteracted by personal preference music. Conclusion Relaxing music, exciting music, and personal preference music effectively counteract mental fatigue by reducing feelings of fatigue and mitigating performance decrements. Individuals engaged in mentally demanding tasks can effectively counteract concurrent or subsequent cognitive performance decrements by simultaneously listening to relaxing or exciting music without lyrics or by using music during recovery from mental fatigue. Exciting music is more effective than relaxing music in counteracting mental fatigue. Personal preference music is effective in counteracting behavioral performance decrements in motor control and endurance tasks. Mentally fatigued individuals could apply personal preference music to counteract subsequent motor control performance decrements or simultaneously listen to it to counteract endurance performance decrements. Future studies should specify and examine the effects of different music genres, tempos, and intensities in counteracting mental fatigue. Additionally, the role of music in counteracting mental fatigue in contexts such as work productivity, traffic accident risk, and sports requires further investigation, along with the underlying mechanisms.
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Duan, Tianhong, Nong Zhang, Kaiway Li, Xuelin Hou, and Jun Pei. "Study on the Preferred Application-Oriented Index for Mental Fatigue Detection." International Journal of Environmental Research and Public Health 15, no. 11 (November 14, 2018): 2555. http://dx.doi.org/10.3390/ijerph15112555.
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Most of the research on mental fatigue evaluation has mainly concentrated on some indexes that require sophisticated and large instruments that make the detection of mental fatigue cumbersome, time-consuming, and difficult to apply on a large scale. A quick and sensitive mental fatigue detection index is necessary so that mentally fatigued workers can be alerted in time and take corresponding countermeasures. However, to date, no studies have compared the sensitivity of common objective evaluation indexes. To solve these problems, this study recruited 56 human subjects. These subjects were evaluated using six fatigue indexes: the Stanford sleepiness scale, digital span, digital decoding, short-term memory, critical flicker fusion frequency (CFF), and speed perception deviation. The results of the fatigue tests before and after mental fatigue were compared, and a one-way analysis of variance (ANOVA) was performed on the speed perception deviation. The results indicated the significance of this index. Considering individual differences, the relative fatigue index (RFI) was proposed to compare the sensitivity of the indexes. The results showed that when the self-rated fatigue grade changed from non-fatigue to mild fatigue, the ranges of RFI values for digital span, digital decoding, short-term memory, and CFF were 0.175–0.258, 0.194–0.316, 0.068–0.139, and 0.055–0.075, respectively. Correspondingly, when the self-rated fatigue grade changed to severe fatigue, the ranges of RFI values for the above indexes were 0.415–0.577, 0.482–0.669, 0.329–0.396, and 0.114–0.218, respectively. These results suggest that the sensitivity of the digital decoding, digital span, short-term memory, and CFF decreased sequentially when the self-evaluated fatigue grade changed from no fatigue to mild or severe fatigue. The RFI individuality of the speed perception deviation is highly variable and is not suitable as an evaluation index. In mental fatigue testing, digital decoding testing can provide faster, more convenient, and more accurate results.
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Muñoz-de-Escalona, Enrique, José J. Cañas, and Paulo Noriega. "Inconsistencies between mental fatigue measures under compensatory control theories." Psicológica Journal 41, no. 2 (July 1, 2020): 103–26. http://dx.doi.org/10.2478/psicolj-2020-0006.
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AbstractMental fatigue has traditionally been defined as a condition of reduced cognitive efficiency and performance, accompanied by a subjective feeling of fatigue. Even though we could expect to find associations between the three defining characteristic of mental fatigue (performance impairment, physiological deactivation and subjective fatigue), research has shown that the emergence of inconsistencies between measures is more frequent than one might expect: people proved capable of maintaining adequate performance levels even after having declared themselves fatigued. This could be explained under the compensatory control mechanism models, which state that humans are able to provide additional resources under demanding conditions, but only at the expense of psychophysiological cost and subjective fatigue. We tested this explanation by manipulating task complexity and time performing a simulated air-traffic control task. We collected psychophysiological, performance and subjective data. A decrease in pupil size was seen in the low-aircraft-density condition, while pupil size remained constant in the high-aircraft-density condition. Participants’ task performance was optimal in both conditions, though they showed an increase in subjective feelings of fatigue, especially in the high-complexity task condition. Thus, complexity seemed to trigger compensatory mechanisms, which reallocated extra resources that physiologically activated participants in order to deal with a higher complexity task, whereas subjective fatigue could be acting as a signal to the organism of impending resource depletion. Our findings support compensatory control theories and offer an explanation of inconsistencies between fatigue measures. Further research on compensatory mechanisms is needed to enable better management of fatigue effects to prevent work-related accidents.
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Herzog, Thomas R., Lauren J. Hayes, Rebecca C. Applin, and Anna M. Weatherly. "Incompatibility and Mental Fatigue." Environment and Behavior 43, no. 6 (September 11, 2010): 827–47. http://dx.doi.org/10.1177/0013916510383242.
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A straightforward prediction from attention restoration theory is that the level of incompatibility in a person’s life should be positively correlated with that person’s level of mental (or directed attention) fatigue. The authors tested this prediction by developing a new self-report measure of incompatibility in which they attempted to isolate all the six categories of incompatibility described by S. Kaplan: distraction, deficit of information, duty, deception, difficulty, and danger. Factor analysis revealed six factors that corresponded reasonably well to those six categories. This article found that a composite incompatibility score was positively correlated with a separate self-report measure of mental fatigue and so were all six of the subscale scores. With the exception of the score for duty, these positive correlations remained after partialing out a separate measure of the level of stress in the person’s life. The authors concluded that the proposed categories of incompatibility can be validly measured; that the constructs of incompatibility, mental fatigue, and stress are discriminable from each other; and that incompatibility is generally positively correlated with mental fatigue.
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Slimani, Maamer, Hela Znazen, Nicola Bragazzi, Mohamed Zguira, and David Tod. "The Effect of Mental Fatigue on Cognitive and Aerobic Performance in Adolescent Active Endurance Athletes: Insights from a Randomized Counterbalanced, Cross-Over Trial." Journal of Clinical Medicine 7, no. 12 (December 3, 2018): 510. http://dx.doi.org/10.3390/jcm7120510.
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The aim of this randomized counterbalanced, 2 × 2 cross-over study was to investigate the effects of mental fatigue on cognitive and aerobic performance in adolescent active endurance athletes. Ten active male endurance athletes (age = 16 ± 1.05 years, height = 1.62 ± 0.04 m, body mass = 55.5 ± 4.2 kg) were familiarized to all experimental procedures on day 1. On days 2 and 3, participants provided a rating of mental fatigue before and after completing a 30 min Stroop test that measures selective attention capacity and skills and their processing speed ability (mentally fatigued condition), or a 30 min control condition in a randomized counterbalanced order. They then performed d2 test and a 20 m multistage fitness test (MSFT), which was used to measure selective and sustained attention and visual scanning speed (i.e., concentration performance (CP) and total number of errors (E)) and aerobic fitness (i.e., maximum oxygen uptake (VO2max) and velocity at which VO2max occurs (vVO2max)), respectively. Rating of perceived exertion (RPE) was assessed after a MSFT. Subjective ratings of mental fatigue were higher after the Stroop task (p < 0.001). CP (p = 0.0.1), E (p < 0.001), vVO2max (p = 0.020), and estimated VO2max (p = 0.021) values were negatively affected by mental fatigue. RPE were significantly higher in the mentally fatigued than in the control conditions (p = 0.02) post-MSFT. Mental fatigue impairs aerobic and cognitive performance in active male endurance athletes.
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Papadakis, Zacharias, Andreas Stamatis, Matthew Manierre, and Ali Boolani. "Preventive Medicine via Lifestyle Medicine Implementation Practices Should Consider Individuals’ Complex Psychosocial Profile." Healthcare 10, no. 12 (December 17, 2022): 2560. http://dx.doi.org/10.3390/healthcare10122560.
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Noncommunicable chronic diseases are associated with lifestyle behaviors. Psychological and social factors may influence the adoption of such behaviors. Being mentally and physically energized or fatigued may influence the intention–behavior gap of healthy lifestyle adoption accordingly. We investigated the associations of age, sex, lifestyle behaviors, mood, and mental and physical energy and fatigue at both the trait and state levels. The participants (N = 670) completed questionnaires assessing their sleep, mood, mental and physical state energy and fatigue, physical activity, mental workload, and diet. The ordinary least squares regression models revealed an overlap between the mental state and trait energy levels for males who consume polyphenols, have a high mental workload, and sleep well. Being younger, having a high stress level, bad sleep habits, and being confused and depressed were associated with high mental fatigue. Physical energy and fatigue shared the same commonalities with the previous results, with greater discrepancies observed between the state and trait indicators compared to that between mental energy and fatigue. Diet and stress management seem to be predictors of high physical energy, and females report higher physical fatigue levels. Health care professionals should consider this psychosocial complex profiling in their differential diagnosis and when one is implementing lifestyle behavioral changes to address the facets of preventive medicine, wellness, and health promotion.
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Herlambang, Mega B., Niels A. Taatgen, and Fokie Cnossen. "The Role of Motivation as a Factor in Mental Fatigue." Human Factors: The Journal of the Human Factors and Ergonomics Society 61, no. 7 (February 28, 2019): 1171–85. http://dx.doi.org/10.1177/0018720819828569.
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Objective: The aim of this study was to assess motivation as a factor in mental fatigue using subjective, performance, and physiological measures. Background: Sustained performance on a mentally demanding task can decrease over time. This decrement has two possible causes: a decline in available resources, meaning that performance cannot be sustained, and decrement in motivation, meaning a decline in willingness to sustain performance. However, so far, few experimental paradigms have effectively and continuously manipulated motivation, which is essential to understand its effect on mental fatigue. Method: Twenty participants performed a working memory task with 14 blocks, which alternated between reward and nonreward for 2.5 hr. In the reward blocks, monetary rewards could be gained for good performance. Besides reaction time and accuracy, we used physiological measures (heart rate variability, pupil diameter, eyeblink, eye movements with a video distractor) and subjective measures of fatigue and mental effort. Results: Participants reported becoming fatigued over time and invested more mental effort in the reward blocks. Even though they reported fatigue, their accuracy in the reward blocks remained constant but declined in the nonreward blocks. Furthermore, in the nonreward blocks, participants became more distractable, invested less cognitive effort, blinked more often, and made fewer saccades. These results showed an effect of motivation on mental fatigue. Conclusion: The evidence suggests that motivation is an important factor in explaining the effects of mental fatigue.
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Gonzalez, Matthew P., Denver M. Y. Brown, Isabella M. Swafford, Bryce Summerville, Morteza Seidi, Marzieh Hajiaghamemar, and Sandor Dorgo. "The Effects of Mental Fatigue on Anaerobic Power and Power Endurance Performance." Sports 12, no. 7 (July 16, 2024): 192. http://dx.doi.org/10.3390/sports12070192.
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Mental fatigue has been studied extensively in relation to its impact on aerobic-, strength-, and motor-based tasks, but anaerobic power-based tasks have received limited attention. Interdisciplinary research investigating the underlying mechanisms by which mental fatigue influences physical performance has been called for. In two studies, the effects of mental fatigue on maximal power jump and endurance jump performance as well as kinetics and kinematics during jump performance were examined. Samples of collegiate volleyball players (Study 1; N = 14) and recreationally active students (Study 2; N = 27) completed two 30 min experimental manipulations (high vs. low cognitive control exertion) before performing three maximal power squat jumps followed by 15 repeated countermovement jumps, with measurements of kinetics and kinematics. For Study 1, the maximal power performance was significantly lower under a mentally fatigued condition, but no differences were observed for repeated jump performance, which may have been attributable to alterations in jump mechanics. For Study 2, no between-condition differences were observed for the maximal power performance, although repeated jump performance was significantly lower under a mentally fatigued condition. Collectively, these findings suggest that the impacts of mental fatigue on power-based performance tasks may depend on the task demands as well as the training status of the individual.
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Butkevičiūtė, Eglė, Aleksėjus Michalkovič, and Liepa Bikulčienė. "ECG Signal Features Classification for the Mental Fatigue Recognition." Mathematics 10, no. 18 (September 19, 2022): 3395. http://dx.doi.org/10.3390/math10183395.
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Mental fatigue is a major public health issue worldwide that is common among both healthy and sick people. In the literature, various modern technologies, together with artificial intelligence techniques, have been proposed. Most techniques consider complex biosignals, such as electroencephalogram, electro-oculogram or classification of basic heart rate variability parameters. Additionally, most studies focus on a particular area, such as driving, surgery, etc. In this paper, a novel approach is presented that combines electrocardiogram (ECG) signal feature extraction, principal component analysis (PCA), and classification using machine learning algorithms. With the aim of daily mental fatigue recognition, an experiment was designed wherein ECG signals were recorded twice a day: in the morning, i.e., a state without fatigue, and in the evening, i.e., a fatigued state. PCA analysis results show that ECG signal parameters, such as Q and R wave amplitude values, as well as QT and T intervals, presented with the largest differences between states compared to other ECG signal parameters. Furthermore, the random forest classifier achieved more than 94.5% accuracy. This work demonstrates the feasibility of ECG signal feature extraction for automatic mental fatigue detection.
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van der Linden, Dimitri, Michael Frese, and Sabine Sonnentag. "The Impact of Mental Fatigue on Exploration in a Complex Computer Task: Rigidity and Loss of Systematic Strategies." Human Factors: The Journal of the Human Factors and Ergonomics Society 45, no. 3 (September 2003): 483–94. http://dx.doi.org/10.1518/hfes.45.3.483.27256.
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We investigated the impact of mental fatigue on exploration in a complex computer task. The exploration behavior of participants who underwent a fatigue manipulation (N = 36) was compared with that of a control (nonfatigued) group (N = 32). A distinction was also made between participants with high or low levels of general computer experience. Results showed that fatigued participants used significantly less systematic exploration and made more errors than did nonfatigued participants. Fatigued participants with low computer experience also showed significantly more rigid behavior than did the other participants. No differences were found on the number of subtasks solved. Compared with low-experience participants, highly experienced participants showed significantly more systematic exploration, less unsystematic trial and error, solved more subtasks, and made fewer errors (marginally significant p = .056). Findings were interpreted as the result of reduced task engagement under fatigue and reduced involvement of executive control on behavior. Actual or potential applications of this research include guidelines to prevent detrimental effects of mental fatigue on exploration behavior.
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Wang, Xinlu, Hongliang Lu, Yang He, Kewei Sun, Tingwei Feng, and Xia Zhu. "Listening to 15 Hz Binaural Beats Enhances the Connectivity of Functional Brain Networks in the Mental Fatigue State—An EEG Study." Brain Sciences 12, no. 9 (August 30, 2022): 1161. http://dx.doi.org/10.3390/brainsci12091161.
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Introduction: It is clear that mental fatigue can have many negative impacts on individuals, such as impairing cognitive function or affecting performance. The aim of this study was to investigate the role of sound interventions in combating mental fatigue. Method: The subjects were assessed on various scales, a psychomotor vigilance task (PVT) task, and a 3 min resting-state electroencephalogram (EEG), followed by a 20 min mental fatigue–inducing task (Time Load Dual Back, TloadDback), during which subjects in different condition groups listened to either 15 Hz binaural beats, 40 Hz binaural beats, relaxing music, or a 240 Hz pure tone. After the mental fatigue–inducing task, subjects were again assessed on various scales, a PVT task, and a 3 min resting-state EEG. Results: After the fatigue-inducing task, there was no significant difference between the four groups on the scales or the PVT task performance. In TloadDback, the accuracy rate of the 40 Hz binaural beats group and the relaxing music group decreased in the middle stage of the task, while the 15 Hz binaural beats group and the 240 Hz pure tone group remained unchanged in all stages of the task. The EEG results showed that after fatigue inducement, the average path length of the 15 Hz binaural beats group decreased, and local efficiency showed an increasing tendency, indicating enhanced brain network connectivity. Meanwhile, the 240 Hz pure tone group showed enhanced functional connectivity, suggesting a state of mental fatigue in the group. Conclusions: The results of this study show that listening to 15 Hz binaural beats is a proven intervention for mental fatigue that can contribute to maintaining working memory function, enhancing brain topological structure, and alleviating the decline in brain function that occurs in a mentally fatigued state. As such, these results are of great scientific and practical value.
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Lou, Jau-Shin, Greg Kearns, Barry Oken, Gary Sexton, and John Nutt. "Exacerbated physical fatigue and mental fatigue in Parkinson's disease." Movement Disorders 16, no. 2 (2001): 190–96. http://dx.doi.org/10.1002/mds.1042.
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Pizova, N. V., and A. V. Pizov. "Mental fatigue and chronic fatigue syndrome in clinical practice." Meditsinskiy sovet = Medical Council, no. 3 (May 2, 2024): 185–92. http://dx.doi.org/10.21518/ms2024-150.
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Fatigue is an extremely disabling symptom both in healthy people and in various diseases. Physical fatigue is characterized by limitations in physical functioning, while mental/cognitive fatigue involves difficulties in concentrating and performing cognitive tasks. Mental and physical fatigue exist in both pathological and physiological fatigue. Fatigue is primarily an adaptive physiological process. It is a signal to have a rest and helps conserve energy to prevent injury, which can be useful after intense work, or when the body’s defenses need to be redistributed, for example, during infectious disease. It is important to distinguish between fatigue or tiredness and chronic fatigue syndrome in clinical practice. Chronic fatigue syndrome has multisystem manifestations and affects millions of people globally. Although the exact aetiology of chronic fatigue syndrome is uncertain, the studies point to neurological, immunological, autonomic and energy disorders. The main sings of chronic fatigue syndrome are debilitating fatigue that is worsened by activity, poor exercise tolerance, unrefreshing sleep and cognitive impairment. Reduced information processing speed is the most common cognitive impairment in chronic fatigue syndrome. Other manifestations include decreased reaction time, working memory, and attention. These symptoms must persist for at least 3–6 months for a diagnosis to be made. As there are no specific tests for chronic fatigue syndrome, a diagnosis can be established on the basis of a medical history and physical examination.Although there are no standards-based methods specific to chronic fatigue syndrome, clinicians can reduce the severity of symptoms using pharmacological and non-pharmacological treatment approaches that have proved their efficacy in clinical practice. In particular, nootropics are widely used in asthenic conditions and chronic fatigue syndrome. Fonturacetam is a nootropic drug that directly activates brain integration activities, promotes memory consolidation, and improves concentration and mental activity.
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Plaksin, V. N. "Materials on student mental fatigue." Neurology Bulletin XVIII, no. 1 (July 6, 2021): 92–109. http://dx.doi.org/10.17816/nb70708.
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In 1907, at the Kazan Commercial School, teachers headed by the director A. I. Nemirovsky conducted experiments. the aim is to find out the mental fatigue of students in the course of the week. At the suggestion of prof. V.P. Osipov adopted the method set forth in the instructions for the production of school psychological experience No. 1, developed by A.P. Nechaev with the participation of members of the Russian Society of Normal and Pathological Psychology.
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Velichkovsky, Boris B. "Cognitive effects of mental fatigue." Moscow University Psychology Bulletin 2019, no. 1 (March 2019): 108–22. http://dx.doi.org/10.11621/vsp.2019.01.108.
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Bentall, Richard P., Graham C. Wood, Teresa Marrinan, Carol Deans, and R. H. T. Edwards. "A brief mental fatigue questionnaire." British Journal of Clinical Psychology 32, no. 3 (September 1993): 375–77. http://dx.doi.org/10.1111/j.2044-8260.1993.tb01070.x.
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LAMBERT, M. V., and A. DAVID. "The importance of mental fatigue." Journal of Neurology, Neurosurgery & Psychiatry 64, no. 4 (April 1, 1998): 430. http://dx.doi.org/10.1136/jnnp.64.4.430.
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Grillon, Christian, David Quispe-Escudero, Ambika Mathur, and Monique Ernst. "Mental fatigue impairs emotion regulation." Emotion 15, no. 3 (June 2015): 383–89. http://dx.doi.org/10.1037/emo0000058.
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Åkerstedt, T., A. Knutsson, P. Westerholm, T. Theorell, L. Alfredsson, and Göran Kecklund. "Mental fatigue, work and sleep." Journal of Psychosomatic Research 57, no. 5 (November 2004): 427–33. http://dx.doi.org/10.1016/j.jpsychores.2003.12.001.
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Martin, Kristy. "Combating mental fatigue in soldiers." Journal of Science and Medicine in Sport 20 (November 2017): S53—S54. http://dx.doi.org/10.1016/j.jsams.2017.09.492.
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Boksem, Maarten A. S., and Mattie Tops. "Mental fatigue: Costs and benefits." Brain Research Reviews 59, no. 1 (November 2008): 125–39. http://dx.doi.org/10.1016/j.brainresrev.2008.07.001.
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Herlambang, Mega B., Fokie Cnossen, and Niels A. Taatgen. "The effects of intrinsic motivation on mental fatigue." PLOS ONE 16, no. 1 (January 4, 2021): e0243754. http://dx.doi.org/10.1371/journal.pone.0243754.
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There have been many studies attempting to disentangle the relation between motivation and mental fatigue. Mental fatigue occurs after performing a demanding task for a prolonged time, and many studies have suggested that motivation can counteract the negative effects of mental fatigue on task performance. To complicate matters, most mental fatigue studies looked exclusively at the effects of extrinsic motivation but not intrinsic motivation. Individuals are said to be extrinsically motivated when they perform a task to attain rewards and avoid punishments, while they are said to be intrinsically motivated when they do for the pleasure of doing the activity. To assess whether intrinsic motivation has similar effects as extrinsic motivation, we conducted an experiment using subjective, performance, and physiological measures (heart rate variability and pupillometry). In this experiment, 28 participants solved Sudoku puzzles on a computer for three hours, with a cat video playing in the corner of the screen. The experiment consisted of 14 blocks with two alternating conditions: low intrinsic motivation and high intrinsic motivation. The main results showed that irrespective of condition, participants reported becoming fatigued over time. They performed better, invested more mental effort physiologically, and were less distracted in high-level than in low-level motivation blocks. The results suggest that similarly to extrinsic motivation, time-on-task effects are modulated by the level of intrinsic motivation: With high intrinsic motivation, people can maintain their performance over time as they seem willing to invest more effort as time progresses than in low intrinsic motivation.
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Raza, Tahira, Muhammad Ashraf Chaudhry, Ahsan Masu, Massiha Gulzar Ahmed, Minahil Ahmed, and Bushra Amin. "Mental Health and Chronic Fatigue Syndrome: Is Mental Health the Culprit Behind Your Fatigue?" BIOMEDICA 36, no. 2 (June 30, 2020): 183–87. http://dx.doi.org/10.51441/biomedica/5-134.
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Raza, Tahira, Muhammad Ashraf Chaudhry, Ahsan Masu, Massiha Gulzar Ahmed, Minahil Ahmed, and Bushra Amin. "Mental Health and Chronic Fatigue Syndrome: Is Mental Health the Culprit Behind Your Fatigue?" BioMedica 36, no. 2 (June 30, 2020): 183–87. http://dx.doi.org/10.24911/biomedica/5-134.
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<p><strong>Background and Objective:</strong> Mental health has proved to affect the physical and emotional aspects of one’s life. Appreciation of its influence on the physical functionality and efficacy of an individual may provide better treatment plans and coping strategies. This study was designed to find out the frequency of depression, anxiety, and stress among medical students at different levels of education, taking gender differences into account and its relation to chronic fatigue syndrome.<br /><strong>Methods:</strong> This cross-sectional descriptive study was carried out from October 2017 – March 2018. Standardized questionnaire was given to 270 MBBS students of Combined Military Hospital (CMH) Medical College, Lahore. The sampling method was non probability convenience sampling. The participants gave free consent. The data was analyzed using SPSS version 23.<br /><strong>Results:</strong> Out of the 270 candidates, 246 had fatigue. Females scored higher on both questionnaires and showed greater frequency of fatigue and mental health problems like stress [P = 0.004]. Over all mental health traits showed statistically significant association with chronic fatigue (P = 0.001).<br /><strong>Conclusion:</strong> Frequency of chronic fatigue among medical students suffering from anxiety, depression and stress is higher as compared to normal students. Female students suffer more from chronic fatigue syndrome, depression, anxiety and stress as compared to males. Strategies to evaluate and rigorously review medical student’s mental problems, and devising appropriate coping mechanisms is essential for their well-being and optimum health.</p>
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Jan, Mohammed M. S. "Intractable Childhood Epilepsy and Maternal Fatigue." Canadian Journal of Neurological Sciences / Journal Canadien des Sciences Neurologiques 33, no. 3 (August 2006): 306–10. http://dx.doi.org/10.1017/s0317167100005187.
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Background:Mothers of children with intractable epilepsy are generally stressed and experience more emotional problems. Fatigue may affect their productivity, social interactions, and their ability to adequately take care of their children. The objectives were to examine the relationship between intractable childhood epilepsy and maternal fatigue, and explore possible contributing factors.Methods:Sixty-four consecutive mothers of children with intractable epilepsy were identified prospectively. Exclusion criteria included degenerative/metabolic disorders or life threatening illness, such as brain tumors. Fatigue was measured using a standardized 11-item questionnaire, which has been revalidated in an Arabic speaking population.Results:Mothers' ages were 24-45 years (mean 34) and ages of their epileptic children were 1-15 years (mean 6.7). Most children (64%) had epilepsy for >2 years, were on >1 antiepileptic drug (AED) (72%), and had daily seizures (47%). Thirty-four (54%) of the children had motor deficits and 83% had mental retardation (severe in 41%). Twenty-eight (44%) mothers were fatigued. Factors associated with increased maternal fatigue included child's age <2 years (p=0.01), cryptogenic epilepsy (p=0.03), and severe motor deficits (p=0.04). Factors associated with lowered fatigue included performing regular exercise (p=0.006), lack of mental retardation (p=0.01), seizure control (p=0.05), using one AED (p=0.002), infrequent ER visits (p=0.005), and lack of recent hospitalization (p=0.005).Conclusion:Mothers of children with intractable epilepsy are increasingly fatigued. Several correlating factors were identified, mostly related to seizure control, mental and physical handicap. Strategies to manage the problem include proper education, seizure control, participation in regular exercise, social support, and psychological counseling.
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Sartain, S., M. McDonnell, M. Dingwall, C. Westoby, V. Katarachia, C. Davis, A. Heinson, S. Wootton, and F. Cummings. "P359 Persistence of severe fatigue in adults with Crohn's disease in remission." Journal of Crohn's and Colitis 18, Supplement_1 (January 1, 2024): i764. http://dx.doi.org/10.1093/ecco-jcc/jjad212.0489.
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Abstract Background Fatigue is a frequent manifestation in patients with Inflammatory Bowel Disease (IBD), including those in remission. The persistence of fatigue over time in inactive disease is not well known. We aimed to determine the prevalence and continuation of severe fatigue at baseline and at 12 months follow-up in a cohort of patients with Crohn’s disease (CD) in remission. Methods Adult patients with CD in remission, defined by age ≥18 years, HBI <5 and faecal calprotectin <250mcg/g, were recruited to the INTICO2 observational study. Baseline assessment included SF36, FACIT-F and IBD Control patient-reported outcome measures. After 12 months in routine care, participants were invited to repeat FACIT-F. Severe fatigue was defined as scoring FACIT-F <30. Baseline data was analysed for factors associated with the persistence of severe fatigue at 12 months. Results A total of 198 patients were studied at baseline, of which 141 completed both baseline and 12-month assessments. The correlation between FACIT-F scores at baseline and 12 months was r = 0.79 (p < 0.001). Twenty-five (17.7%) patients were severely fatigued at both baseline and 12-month follow-up, and 99 (72.1%) were not severely fatigued at either time. Of the 34 patients severely fatigued at baseline, 9 (26.5%) were not severely fatigued at 12 months. From the 107 patients who were not severely fatigued at baseline, 12 (7.5%) became severely fatigued at 12 months. Participants with ongoing severe fatigue at baseline and 12 months had significantly worse SF36 Mental Health scores, 64 v 80 (p <0.001), and more night waking due to IBD, 32.0% v 7.1% (p = 0.011), at baseline assessment than those not severely fatigued at either assessment, see Table 1. Eight patients had a clinical disease flare during the 12-month follow-up period. Conclusion Most patients in this cohort in remission continued to have similar fatigue severity at 12-month follow-up. A higher proportion of severely fatigued patients at baseline improved at 12 months than non-severely fatigued patients at baseline developing severe fatigue at 12 months. Factors at baseline associated with persistent severe fatigue were worse mental health and poor sleep secondary to IBD. These may represent areas where intervention could improve reported fatigue levels in remission.
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Hussein, Shagul, and Ronak Hussain. "Prevalence and Persistent Fatigue among Patients Post COVID-19 in Erbil City." Erbil Journal of Nursing and Midwifery 6, no. 2 (November 30, 2023): 116–24. http://dx.doi.org/10.15218/ejnm.2023.13.
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Background and objectives: Fatigue is one of the most common symptoms, affecting more than 75% of people. It is a subjective lack of physical or mental energy. The goal of the study was to assess persistent fatigue among patients Post-COVID-19 in Erbil city. Methods: A quantitative, descriptive cross-sectional study was conducted at a private clinic and home for patients in Erbil city. A nonprobability-purposive sample was selected for 300 Post-covid patients. Data was collected through interviews using a questionnaire, and a modified fatigue impact scale was used to assess patients’ fatigue in post-COVID-19. Results: The results show that one third (31.7%) of the study samples were older than 50 years, and more than half (52.3%) were males, less than one third (28.3%) graduated from an institute, and more than one third (32.3%) were housewives. The majority of the samples (84.7%) lived in areas, and almost all the samples (81.7%) were married. Most of the samples (73.0%) without comorbidity disease about 75.3 were overweight, and the samples (83.0%) were not hospitalized during COVID-19, about more than half (67.0%) were not received oxygen. Less than half (46.3%) of the samples have physical fatigue, and more than half (63.7%) have mild mental fatigue. There was a significant association between fatigue and gender, hospitalization, and receiving oxygen during COVID-19 at P-value ≤ 0.05. Conclusion: The study concluded that the participants have physical and mental fatigue and physical and mental fatigues are decreasing by increasing the duration of illness from the first to the sixth month. A significant difference was found between fatigue and the female gender.
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Zeng, Chao, Wenjun Wang, Chaoyang Chen, Chaofei Zhang, and Bo Cheng. "Sex Differences in Time-Domain and Frequency-Domain Heart Rate Variability Measures of Fatigued Drivers." International Journal of Environmental Research and Public Health 17, no. 22 (November 17, 2020): 8499. http://dx.doi.org/10.3390/ijerph17228499.
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The effects of fatigue on a driver’s autonomic nervous system (ANS) were investigated through heart rate variability (HRV) measures considering the difference of sex. Electrocardiogram (ECG) data from 18 drivers were recorded during a simulator-based driving experiment. Thirteen short-term HRV measures were extracted through time-domain and frequency-domain methods. First, differences in HRV measures related to mental state (alert or fatigued) were analyzed in all subjects. Then, sex-specific changes between alert and fatigued states were investigated. Finally, sex differences between alert and fatigued states were compared. For all subjects, ten measures showed significant differences (Mann-Whitney U test, p < 0.01) between different mental states. In male and female drivers, eight and four measures, respectively, showed significant differences between different mental states. Six measures showed significant differences between males and females in an alert state, while ten measures showed significant sex differences in a fatigued state. In conclusion, fatigue impacts drivers’ ANS activity, and this impact differs by sex; more differences exist between male and female drivers’ ANS activity in a fatigued state than in an alert state.
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Giorgi, Andrea, Gianluca Borghini, Francesca Colaiuda, Stefano Menicocci, Vincenzo Ronca, Alessia Vozzi, Dario Rossi, et al. "Driving Fatigue Onset and Visual Attention: An Electroencephalography-Driven Analysis of Ocular Behavior in a Driving Simulation Task." Behavioral Sciences 14, no. 11 (November 13, 2024): 1090. http://dx.doi.org/10.3390/bs14111090.
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Attentional deficits have tragic consequences on road safety. These deficits are not solely caused by distraction, since they can also arise from other mental impairments such as, most frequently, mental fatigue. Fatigue is among the most prevalent impairing conditions while driving, degrading drivers’ cognitive and physical abilities. This issue is particularly relevant for professional drivers, who spend most of their time behind the wheel. While scientific literature already documented the behavioral effects of driving fatigue, most studies have focused on drivers under sleep deprivation or anyhow at severe fatigue degrees, since it is difficult to recognize the onset of fatigue. The present study employed an EEG-driven approach to detect early signs of fatigue in professional drivers during a simulated task, with the aim of studying visual attention as fatigue begins to set in. Short-range and long-range professional drivers were recruited to take part in a 45-min-long simulated driving experiment. Questionnaires were used to validate the experimental protocol. A previously validated EEG index, the MDrow, was adopted as the benchmark measure for identifying the “fatigued” spans. Results of the eye-tracking analysis showed that, when fatigued, professional drivers tended to focus on non-informative portions of the driving environment. This paper presents evidence that an EEG-driven approach can be used to detect the onset of fatigue while driving and to study the related visual attention patterns. It was found that the onset of fatigue did not differentially impact drivers depending on their professional activity (short- vs. long-range delivery).
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Tardy, Anne-Laure, Beatrice Bois De Fer, Salvador Cañigueral, David Kennedy, Andrew Scholey, Simon Hitier, Alexia Aran, and Etienne Pouteau. "Reduced Self-Perception of Fatigue after Intake of Panax ginseng Root Extract (G115®) Formulated with Vitamins and Minerals—An Open-Label Study." International Journal of Environmental Research and Public Health 18, no. 12 (June 9, 2021): 6257. http://dx.doi.org/10.3390/ijerph18126257.
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Background: Unexplained fatigue is a common complaint. When underlying disease causes have been eliminated, lifestyle measures and supplementation can be indicated. Elaborating on clinical findings that G115®, a dry extract from the root of Panax ginseng, combined with vitamins and minerals could alleviate fatigue, this open label study aimed at assessing its effect on perceived fatigue and energy. Methods: Healthy adults self-reporting fatigue (n = 103) completed the Multidimensional Fatigue Inventory questionnaire. They rated their perceptions of mental and physical fatigue, energy, performance, and stress at baseline and 15, 30, 60 and 90 days after a daily intake of 40 mg G115® formulated with vitamins and minerals. Results: Compared with baseline values, mean self-perception of general fatigue was reduced by −7.55 units [95% CI: −8.44; −6.66] (−41.8%, p < 0.0001) at 90 days. All assessed perception ratings (mental and physical fatigue, reduced activity and motivation, performance, and stress) were significantly and steadily improved from two weeks after supplementation up to study’s end. Overall satisfaction with the ability of the product to reduce fatigue reached 85% at Day 90. Conclusion: Daily intake with G115® extract formulated with vitamins and minerals suggests an improvement of self-perception of fatigue and energy in a fatigued adult population.
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Bafna, Tanya, Per Bækgaard, and John Paulin Hansen. "Mental fatigue prediction during eye-typing." PLOS ONE 16, no. 2 (February 22, 2021): e0246739. http://dx.doi.org/10.1371/journal.pone.0246739.
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Mental fatigue is a common problem associated with neurological disorders. Until now, there has not been a method to assess mental fatigue on a continuous scale. Camera-based eye-typing is commonly used for communication by people with severe neurological disorders. We designed a working memory-based eye-typing experiment with 18 healthy participants, and obtained eye-tracking and typing performance data in addition to their subjective scores on perceived effort for every sentence typed and mental fatigue, to create a model of mental fatigue for eye-typing. The features of the model were the eye-based blink frequency, eye height and baseline-related pupil diameter. We predicted subjective ratings of mental fatigue on a six-point Likert scale, using random forest regression, with 22% lower mean absolute error than using simulations. When additionally including task difficulty (i.e. the difficulty of the sentences typed) as a feature, the variance explained by the model increased by 9%. This indicates that task difficulty plays an important role in modelling mental fatigue. The results demonstrate the feasibility of objective and non-intrusive measurement of fatigue on a continuous scale.
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Valenza, Alessandro, Harry Charlier, Antonino Bianco, and Davide Filingeri. "Independent and interactive effects of thermal stress and mental fatigue on manual dexterity." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 319, no. 6 (December 1, 2020): R703—R711. http://dx.doi.org/10.1152/ajpregu.00226.2020.
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Many occupations and sports require high levels of manual dexterity under thermal stress and mental fatigue. Yet, multistressor studies remain scarce. We quantified the interactive effects of thermal stress and mental fatigue on manual dexterity. Seven males (21.1 ± 1.3 yr) underwent six separate 60-min trials characterized by a combination of three air temperatures (hot, 37°C; neutral, 21°C; cold, 7°C) and two mental fatigue states (MF, mental fatigue induced by a 35-min cognitive battery; no-MF, no mental fatigue). Participants performed complex (O’Connor test) and simple (hand-tool test) manual tasks pre- and posttrial to determine stressor-induced performance changes. We monitored participants’ rectal temperature and hand skin temperature (Thand) continuously and assessed the reaction time (hand-click test) and subjective mental fatigue (5-point scale). Thermal stress ( P < 0.0001), but not mental fatigue ( P = 0.290), modulated Thand (heat, +3.3°C [95% CI: +0.2, +6.5]; cold, −7.5°C [−10.7, −4.4]). Mental fatigue ( P = 0.021), but not thermal stress ( P = 0.646), slowed the reaction time (∼10%) and increased subjective fatigue. Thermal stress and mental fatigue had an interactive effect on the complex manual task ( P = 0.040), with cold-no-MF decreasing the performance by −22% [−39, −5], whereas neutral-MF, cold-MF, and heat-MF by −36% [−53, −19], −34% [−52, −17], and −36% [−53, −19], respectively. Only mental fatigue decreased the performance in the simple manual task (−30% [−43, −16] across all thermal conditions; P = 0.002). Cold stress-induced impairments in complex manipulation increase with mental fatigue; yet combined stressors’ effects are no greater than those of mental fatigue alone, which also impairs simple manipulation. Mental fatigue poses a greater challenge to manual dexterity than thermal stress.
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Mehta, Ranjana K., and Raja Parasuraman. "Effects of Mental Fatigue on the Development of Physical Fatigue." Human Factors: The Journal of the Human Factors and Ergonomics Society 56, no. 4 (October 23, 2013): 645–56. http://dx.doi.org/10.1177/0018720813507279.
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Vandenbergen, Jan, Stijn Vanheule, Mattias Desmet, and Paul Verhaeghe. "Unexplained Chronic Fatigue and Interpersonal Problems: A Study in a Primary Care Population." International Journal of Psychiatry in Medicine 39, no. 3 (September 2009): 325–40. http://dx.doi.org/10.2190/pm.39.3.h.
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Objective: Unexplained fatigue syndromes are multidimensional phenomena that involve a constellation of symptoms. This article explores whether typical interpersonal problems are associated with self-reported and clinically-rated fatigue symptoms in chronically fatigued patients. We hypothesize that the severity of fatigue symptoms will be associated with a pattern of withdrawal from social interaction. Method: Interpersonal problems were assessed by means of a self-report questionnaire. Chronic fatigue was assessed with a self-report questionnaire (both self-rated and clinically-rated) in a primary care Chronic Fatigue Syndrome (CFS) group ( N = 52) and compared with two other clinical populations (minor medical condition: N = 51; chronic organic disease: N = 52). Results: Compared to patients with a minor medical condition, CFS patients are substantially more fatigued and more socially withdrawn. Compared to patients with a chronic organic disease, somewhat more fatigue-related disability was observed in CFS patients, but no distinct interpersonal problems came to the fore. CFS patients and physicians proved to differ in their opinion on the patient's motivation. In line with the hypothesis, self-rated and clinically-scored fatigue problems proved to be related to a pattern of withdrawal from social interaction. Conclusion: Differences between physicians' and patients in how symptoms are interpreted might be related to patients feeling misunderstood and result in social withdrawal.
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Johansson, Birgitta, and Lars Rönnbäck. "Mental Fatigue and Cognitive Impairment after an Almost Neurological Recovered Stroke." ISRN Psychiatry 2012 (June 25, 2012): 1–7. http://dx.doi.org/10.5402/2012/686425.
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Mental fatigue is for many a distressing and long-term problem after stroke. This mental fatigue will make it more difficult for the person to return to work and previous activities. The intention with this study is to investigate mental fatigue in relation to depression and cognitive functions. We examined 24 well-rehabilitated stroke subjects, who suffered from mental fatigue one year or more after a stroke, and 24 healthy controls. Subjects were examined using self-assessment scales for mental fatigue, depression and anxiety, and cognitive tests. The results showed a highly increased rating for mental fatigue for the stroke group (P<0.001). These participants also had a significantly higher rating on the depression (P<0.001) and anxiety (P<0.001) scales. Furthermore, they had a slower information processing speed (P<0.001) and made more errors in a demanding attention and speed test (P<0.05). Among the cognitive tests, processing speed and errors made in an attention and speed test were significant predictors for mental fatigue. We suggest mental fatigue following a stroke to be related to cognitive impairments, primarily information processing speed. Mental fatigue should also be treated as a separate phenomenon and should be differentiated from, and not confused with, depression, even if overlapping symptoms exist.
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Goudini, Reza, Ali Zahiri, Shahab Alizadeh, Benjamin Drury, Saman Hadjizadeh Anvar, Abdolhamid Daneshjoo, and David G. Behm. "The Effects of Physical and Mental Fatigue on Time Perception." Sports 12, no. 2 (February 15, 2024): 59. http://dx.doi.org/10.3390/sports12020059.
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The perception of time holds a foundational significance regarding how we elucidate the chronological progression of events. While some studies have examined exercise effects on time perception during exercise periods, there are no studies investigating the effects of exercise fatigue on time perception after an exercise intervention. This study investigated the effects of physical and mental fatigue on time estimates over 30 s immediately post-exercise and 6 min post-test. Seventeen volunteers were subjected to three conditions: physical fatigue, mental fatigue, and control. All participants completed a familiarization session and were subjected to three 30 min experimental conditions (control, physical fatigue (cycling at 65% peak power output), and mental fatigue (Stroop task)) on separate days. Time perception, heart rate, and body temperature were recorded pre-test; at the start of the test; 5, 10, 20, 30 seconds into the interventions; post-test; and at the 6 min follow-up. Rating of perceived exertion (RPE) was recorded four times during the intervention. Physical fatigue resulted in a significant (p = 0.001) underestimation of time compared to mental fatigue and control conditions at the post-test and follow-up, with no significant differences between mental fatigue and control conditions. Heart rate, body temperature, and RPE were significantly (all p = 0.001) higher with physical fatigue compared to mental fatigue and control conditions during the intervention and post-test. This study demonstrated that cycling-induced fatigue led to time underestimation compared to mental fatigue and control conditions. It is crucial to consider that physical fatigue has the potential to lengthen an individual’s perception of time estimates in sports or work environments.
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Zheng, Mufan, Hongyi Li, and Bicheng Gao. "Mental Fatigue Increases Utilitarian Moral Judgments During COVID-19." Social Behavior and Personality: an international journal 51, no. 3 (March 1, 2023): 1–13. http://dx.doi.org/10.2224/sbp.12004.
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This research investigated how mental fatigue is associated with moral judgments during the COVID-19 pandemic and studied the moderating effect of social support. We used self-report questionnaires to collect data from 4,042 people. We assessed people's mental fatigue and social support during the pandemic, and designed nine moral dilemmas based on the background of COVID-19 to measure people's moral judgments. The results showed that during the COVID-19 pandemic mental fatigue had a significant impact on moral judgments. Individuals with higher mental fatigue were more likely to make more utilitarian choices, while social support moderated the relationship between mental fatigue and moral judgments. When experiencing mental fatigue, individuals with low, compared to high, social support are more likely to rely on utilitarianism to make moral judgments.
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Monteiro, Thiago Gabriel, Guoyuan Li, Charlotte Skourup, and Houxiang Zhang. "Investigating an Integrated Sensor Fusion System for Mental Fatigue Assessment for Demanding Maritime Operations." Sensors 20, no. 9 (May 2, 2020): 2588. http://dx.doi.org/10.3390/s20092588.
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Human-related issues are currently the most significant factor in maritime causalities, especially in demanding operations that require coordination between two or more vessels and/or other maritime structures. Some of these human-related issues include incorrect, incomplete, or nonexistent following of procedures; lack of situational awareness; and physical or mental fatigue. Among these, mental fatigue is especially dangerous, due to its capacity to reduce reaction time, interfere in the decision-making process, and affect situational awareness. Mental fatigue is also especially hard to identify and quantify. Self-assessment of mental fatigue may not be reliable and few studies have assessed mental fatigue in maritime operations, especially in real time. In this work we propose an integrated sensor fusion system for mental fatigue assessment using physiological sensors and convolutional neural networks. We show, by using a simulated navigation experiment, how data from different sensors can be fused into a robust mental fatigue assessment tool, capable of achieving up to 100 % detection accuracy for single-subject classification. Additionally, the use of different sensors seems to favor the representation of the transition between mental fatigue states.
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Kunrath, Caito André, Felippe da Silva Leite Cardoso, Tomás García Calvo, and Israel Teoldo da Costa. "MENTAL FATIGUE IN SOCCER: A SYSTEMATIC REVIEW." Revista Brasileira de Medicina do Esporte 26, no. 2 (April 2020): 172–78. http://dx.doi.org/10.1590/1517-869220202602208206.
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ABSTRACT Fatigue in soccer players is traditionally investigated based on neuromuscular and metabolic factors. However, given that soccer is one of the sports that has the highest cognitive demand, it is believed that players' performance might also be influenced by the high levels of attention, and frequent decision-making required in soccer. This systematic review aimed to verify the effects of mental fatigue on physical, technical, tactical and cognitive performance of soccer players. We searched in the electronic databases Pubmed, Web of Science and Scopus, for articles published up to 30 April 2018. We included articles that used a protocol of mental fatigue through cognitive tasks performed prior to a physical or cognitive task related to soccer. Only studies that presented an experimental design with the control condition (without mental fatigue) and the experimental condition (with mental fatigue) were selected. A total of six articles met the inclusion criteria, one study by backward reference search and other through the authors' indication. The results showed smaller distances covered in physical tests, while the effects of mental fatigue on physical performance in small-sided games were not clear. In technical tests, there were more penalties in passes and less accuracy and speed when kicking the ball when players were in conditions of mental fatigue. Regarding the tactical variables, it was found that mental fatigue had a detrimental effect on the synchronization between team players and on individual tactical performance in defensive actions. In cognitive tests, based on video recordings of game play, negative effects on the players' speed and accuracy of decision-making were observed. According to the results of the literature search, it can be inferred that mental fatigue is a factor that has a negative influence on soccer performance. Level of evidence II; Systematic review.
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Maffiuletti, NA, and R. Lepers. "Muscular and mental fatigue in surgeons." Annals of The Royal College of Surgeons of England 94, no. 1 (March 2012): 67. http://dx.doi.org/10.1308/003588412x13171221499946.
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Faber, Léon G., Natasha M. Maurits, and Monicque M. Lorist. "Mental Fatigue Affects Visual Selective Attention." PLoS ONE 7, no. 10 (October 31, 2012): e48073. http://dx.doi.org/10.1371/journal.pone.0048073.
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