Dissertations / Theses on the topic 'Stretch (Physiology) Stretching exercises'

This study examined the short-term training effects of two volumes of a dynamic warm up performed 4 days per week over a 3 1/2-week period. A total of 25 Division III wrestlers volunteered for the study. Three participants either dropped out or were unable to attend post-testing, resulting in 22 total participants completing the study. Groups were divided into control, low volume, and high volume groups. All participants completed pre and poststudy performance tests including the standing long jump, proagility, start-stop-cut, and 30- meter sprint. The low and high volume training groups each performed the same dynamic warm up prior to each pre-season captain's practice. The control group did not participate in an organized warm up. The low volume group performed one set of each warm up exercise, and the high volume group performing two sets of each warm up exercise. Data analysis indicated significant increases in performance for the standing long jump (p = .011) and start-stop-cut (p = .000) measures among the entire sample population. However, there was no significant difference between the groups in these measures. No significant results were found either for the sample as a whole or between groups for the proagility and 30-meter measures. The increased performance of all groups, including the control group, fails to provide evidence for the effectiveness of training with either warm up volume. Further research is needed to address limitations of this study to determine effectiveness of various warm up volumes.

Les étirements sont aujourd'hui une pratique courante dans les milieux sportifs et de réadaptation. Ils sont habituellement recommandés dans le but de contribuer à la prévention des blessures (Willson et al. 1991 ;Pope et al. 2000), à l’amélioration de la performance sportive lorsque celle-ci nécessite une amplitude articulaire importante (Heyters, 1985 ;Hortobagyi et al. 1985) et à la récupération de la mobilité articulaire dans le cadre d’un programme de réadaptation (Magnusson et al. 1996b). Ces méthodes, qui se sont développées ces dernières années, font classiquement appel à l’étirement passif et aux étirements neurofacilités (PNF), présentés initialement par Kabat (1958). Plus récemment, un intérêt particulier a été porté au travail musculaire excentrique. Des études ont montré que celui-ci permettait également d’augmenter l’amplitude articulaire (Willson et al. 1991 ;Nelson et Bandy, 2004).

Dans une première partie de ce travail, il nous a semblé intéressant de comparer les effets de l’étirement passif à ceux des étirements PNF par "contracté-relâché" et "contracté de l’antagoniste". Si les modalités d'application de chaque étirement sont différentes, elles présentent un intérêt majeur. De fait, elles permettent de faire varier les conditions d'allongement des différentes structures du système myotendineux, en modulant l'activité volontaire des musculatures agoniste ou antagoniste. En effet, si l’étirement passif s'effectue sans activation volontaire, l’étirement par "contracté-relâché" consiste à faire précéder l'étirement passif, d'une contraction volontaire maximale isométrique de la musculature agoniste. L’étirement par "contracté de l’antagoniste" associe à l'allongement de la musculature agoniste, une contraction volontaire maximale de la musculature antagoniste. Si de nombreuses études s'intéressent encore actuellement à caractériser leurs effets respectifs, elles ont déjà permis de montrer que ceux-ci avaient au moins deux origines distinctes, l'une neurophysiologique et l'autre mécanique (Taylor et al. 1990 ;Hutton, 1993). Au plan neurophysiologique, il est bien accepté que ces méthodes induisent une modulation de l'activité réflexe tonique facilitant le relâchement musculaire et par conséquent l’amplitude articulaire (Guissard et al. 1988 ;2001). Il est également bien admis que l’importance de ces effets sur la musculature est variable selon la méthode employée (Guissard et Duchateau, 2006). Au plan mécanique, des études menées chez l’animal ont montré que l’étirement passif modifie les caractéristiques viscoélastiques des tissus (Taylor et al. 1990), et de fait favorise l’allongement des tissus myotendineux (McHugh et al. 1992). Chez le sujet humain, plusieurs expérimentations ont montré que l’étirement par "contracté-relâché" permet d’obtenir un allongement myotendineux et un gain d’amplitude articulaire plus important que par étirement passif (Moore et Hutton, 1980). D’autres études ont montré que l’étirement par "contracté de l’antagoniste" permet de majorer encore les gains obtenus par l’étirement "contracté-relâché" (Osternig et al. 1990). Une première question posée dans ce travail est de savoir si la contribution des processus neurophysiologiques et mécaniques se traduit d’une manière spécifique sur le rapport de compliance des tissus de l’unité myotendineuse. Le développement de techniques d’investigation, telles que l’échographie, permet désormais d’observer le comportement de l’unité myotendineuse, d’une manière non invasive (Fukunaga et al. 1992 ;Herbert et Gandevia, 1995 ;Kuno et Fukunaga, 1995 ;Maganaris et al. 1998). Elle permet ainsi d’étudier les effets d’un étirement ou d’une contraction (Fukunaga et al. 1996) sur le rapport de compliance des structures musculaires et des tissus tendineux.

S’il était intéressant d’étudier la spécificité de ces trois méthodes d’étirement classiques par rapport à leurs effets sur les tissus myotendineux, il nous paraissait pertinent d’observer celle d’un travail musculaire excentrique. En effet, la particularité de celui-ci est de soumettre l’unité myotendineuse préalablement activée, à un allongement. En réadaptation, le travail excentrique est généralement proposé dans le but d’améliorer plus rapidement la symptomatologie d’une tendinopathie (Stanish et al. 1986 ;Alfredson et al. 1998). Des études récentes ont indiqué qu’il peut également être proposé pour augmenter l'amplitude articulaire (Nelson et Bandy, 2004). Toutefois, ses effets sur les tissus myotendineux ne sont pas clairement définis dans la littérature. Chez l’animal, Heinemeier et al. (2007) ont comparé les effets d’un entraînement en contractions concentriques et excentriques sur les tissus de l’unité myotendineuse. Leurs résultats indiquent que si les tissus tendineux sont sensibles aux deux modes de contraction pour leurs effets favorisant la synthèse de collagène, les structures musculaires sont spécifiquement sensibles au mode excentrique. Chez le sujet humain, Crameri et al. (2004) ont observé une série de contractions excentriques d’intensité maximale augmente la synthèse de collagène au sein de l’ensemble des tissus de l’unité myotendineuse. Ces résultats montrent que les effets de ce travail ne se limitent pas aux tissus tendineux, tels que certains protocoles thérapeutiques le suggéraient, et que le tissu musculaire doit désormais être associé à la discussion des effets de ce travail musculaire. Dans ce contexte, la deuxième question que nous avons posée est de savoir si l’étirement de l’unité myotendineuse préalablement activée, telle que se caractérise une contraction excentrique, modifie le rapport de compliance des tissus myotendineux par rapport aux méthodes classiques. Autrement dit, si l’étirement de l’unité myotendineuse activée favorise spécifiquement l’allongement de l’un des tissus de l’unité myotendineuse.

Dans une troisième partie, il nous a paru intéressant d'étudier le comportement à l’étirement de l’unité myotendineuse, dont la compliance était modifiée suite à une désadaptation à long terme. L’hypertonie spastique, qui caractérise une majorité de sujets parétiques spastiques, est généralement caractérisée par une augmentation anormale des résistances opposées à l'étirement passif (Carey et Burghart, 1993). L’origine de ces résistances peut être attribuée à des adaptations tant neurophysiologiques (Pierrot-Deseilligny et Mazières, 1985) que mécaniques et structurelles des tissus de l'unité myotendineuse (Berger et al. 1984 ;Tardieu et al. 1989). Il n’existe pourtant pas encore dans la littérature de consensus les définissant clairement (Fridén et Lieber, 2003). En outre, l’étude récente de Lieber et Fridén (2002) a mis en évidence des modifications de l’architecture des muscles fléchisseurs du carpe. Contrairement à ce qui est généralement proposé au sujet de la longueur des fascicules spastiques (Tardieu et al. 1982), Lieber et Fridén (2002) n’ont pas mis en évidence de raccourcissement de ces derniers. Ainsi, l’hypothèse de Tardieu et al. (1982), selon laquelle le raccourcissement des fascicules est à l’origine de l’augmentation des résistances à l’allongement, ne peut plus être soutenue. Il nous paraissait ainsi intéressant d’associer, à l’observation du comportement des fascicules, celui des tissus tendineux, dans le but de déterminer si l’une de ces deux structures présente des caractéristiques particulières, susceptibles d’expliquer le développement plus important de ces résistances à l’allongement. La troisième question que nous avons posée dans ce travail est de savoir comment se caractérise, à l’étirement, le rapport de compliance des tissus musculaire et tendineux dans un contexte de spasticité.

Outre le fait que la réponse à ces différentes questions soit fondamentale pour mieux comprendre et spécifier la pratique des méthodes d’étirement, l’objectif de notre travail est non seulement de mettre en évidence le tissu dont l’allongement est spécifiquement favorisé par l’une ou l’autre méthode, mais également de contribuer à différencier celui qui limite l’étirement global du système myotendineux. Dans ce contexte, il sera intéressant de pouvoir recommander la pratique d’une méthode particulière, en fonction des besoins spécifiques de chacun.

Doctorat en Sciences de la motricité
info:eu-repo/semantics/nonPublished

Thesis (M. Phil.)--University of Sydney, 2009.
Title from title screen (viewed September 25, 2009) Submitted in fulfilment of the requirements for the degree of Master of Philosophy to the Faculty of Medicine. Includes bibliographical references. Also available in print form.

Thesis (Ph.D.)--University of Toledo, 2004.
Typescript. "A dissertation [submitted] as partial fulfillment of the requirements of the Doctor of Philosophy degree in Exercise Science." Bibliography: leaves 72-77.

[Truncated abstract] First metatarsophalangeal joint (MTPJ1) motion is an important factor in normal weight transference during walking. Disruptions to normal range can influence joints both proximal and distal to the MTPJ1, potentially leading to pain and dysfunction. Whilst the MTPJ1 has been investigated significantly, the numerous methodologies described to quantify range of motion can be questioned and makes comparisons difficult. Range of MTPJ1 motion is commonly assessed in a clinical setting to determine pathology as well as to make decisions on appropriate intervention. The anatomical and biomechanical influence of tendo Achilles load and MTPJ1 motion has been well described; however few studies measuring MTPJ1 range control for Achilles load or describe ankle joint positioning. Further to this the effects of reducing tendo Achilles stiffness on MTPJ1 extensions has yet to be investigated. The purpose of this study was to describe a technique to quantify passive MTPJ1 extension and to determine the influence of ankle joint position on joint range. Secondly the effect of calf muscle stretching on MTPJ1 range was also investigated. The information gathered will assist both research and clinical protocols for quantifying MTPJ1 range, and provide a greater understanding of the anatomic and biomechanical relationship between tendo Achilles load and MTPJ1 extension. In order to fulfil the purposes of the study it was necessary to establish a reliable methodology to quantify non weight bearing MTPJ1 extension. Reliability testing was undertaken in three parts. '...' The results demonstrated a statistically significant increase in joint range immediately following a one minute stretch for variables ankle joint range of motion as well as MTPJ1 extension for ankle joint plantar flexed at 10 Newton's and ankle joint neutral and plantar flexed at 30 Newtons. No significant differences were noted in ankle or MTPJ1 range of motion in either the control group on immediate re-testing, or in both groups after a one week stretch program. The findings of this study support those documented in the literature pertaining to the ankle joint position, tendo Achilles load and plantar fascial stiffness to MTPJ1 range of motion. Increased stiffness at the MTPJ1 was noted dependant on ankle joint position from ankle joint plantar flexion through to ankle joint dorsiflexion. This appears most likely due to increases in tendo Achilles load and subsequent forces transmitted to the plantar aponeurosis. The present study also demonstrated a trend towards increased joint extensibility and limb dominance. The study also supports previous literature into gender differences and joint extensibility, with a positive trend towards increased MTPJ1 range evident in the female subjects tested. The study also demonstrated the immediate effect of calf muscle stretching on ankle and MTPJ1 range of motion. It remains however unclear as to the exact mechanisms involved in producing increased joint range be it reflex inhibition or actual changes to the viscoelastic properties of the soft tissues. Despite this, no changes were evident following a one week stretching program, which supports previous literature describing a short lag time before soft tissues revert to baseline length properties following a single stretch session.

The purpose of this research was to evaluate the effects of a long-term static stretching program on flexibility and spinal reflexes in the human soleus muscle. Day-to-day reliability over two days of H-reflex gain (Hslp/Mslp) and pre-synaptic inhibition of spinal reflexes in the human soleus was measured in an initial study. Thirty subjects (age=23.4 ± 3.9 yr, height=175.64 ± 10.87 cm, weight=84.5 ± 24.18 kg) with no history of lower leg pathology and/or injury within the previous 12 months volunteered. The slopes of the ascending portions of the H-reflex and M-wave recruitment curves were used to evaluate H-reflex gain (Hslp/Mslp). The mean soleus H-reflex from 10 conditioning stimulations and 10 unconditioned stimulations was used to calculate the amount of pre-synaptic inhibition. Measurements of H-reflex gain and pre-synaptic inhibition yielded test-retest reliability of R=.95 and R=.91, respectively. The contribution of pre-synaptic and post-synaptic reciprocal mechanisms in flexibility adaptations has not been measured during the same study. A long-term static stretching program (5 times per week for 6 weeks) of the soleus implemented within an experimental group of 20 subjects was used as an intervention to measure both spinal control flexibility changes. Additionally, 20 control subjects were measured that did not participate in the stretching program. Passive ankle dorsiflexion, Hmax/Mmax, H-reflex gain (Hslp/Mslp), pre-synaptic and post-synaptic reciprocal mechanisms were measured at baseline, 3 weeks, and 6 weeks for all 40 subjects. A 2 (Group) X 2 (Sex) X 3 (Time) mixed MANOVA with Tukey HSD with (a<0.05) was used. Only ROM had a significant interaction between Group and Time, whereas, a significant difference was not detected in the other dependent variables. The experimental group demonstrated significantly improved dorsiflexion ROM from baseline to 3 weeks (mean=6.2 ± .88, P<0.001), 3 weeks to 6 weeks (mean=4.9 ± .84, P<0.001), and baseline to 6 weeks (mean=11.2 ± .91, P<0.001). Consequently, the increase in flexibility by 42% after 30 stretching sessions was not the result of spinal reflex changes.
Graduation date: 2006

A dissertation submitted in partial compliance with the requirements for the Master's Diploma in Technikon: Chiropractic, Technikon Natal, 1998.
Mechanical low back pain is a common clinical entity which needs professional treatment (Margo 1994). Due to the nature of mechanical low back pain, recurrence of pain is a common entity that can cripple a patient and the ~tate financially. It is for'this reason that the professionals need to establish a cost effective method of treatment that helps maintain the pain free state and prevent recurrences
M

Thesis (Ph. D.)--Oregon State University, 2006.
Blank pages 143 and 159 not microfilmed. Includes bibliographical references. Also available online (PDF file) by a subscription to the set or by purchasing the individual file.

by Chan Suk Ping.
Thesis (M.Phil.)--Chinese University of Hong Kong, 1998.
Includes bibliographical references (leaves 105-119).
Abstract also in Chinese.
Acknowledgments --- p.i
Abstract --- p.ii
List of Tables --- p.ix
List of Figures --- p.xii
Abbreviation --- p.xiv
Chapter CHAPTER ONE --- INTRODUCTION
Chapter 1.1 --- Background --- p.1
Chapter 1.2 --- The Research Problem --- p.7
Chapter 1.2.1 --- Purpose of The Study --- p.7
Chapter 1.2.2 --- Variables and Definition of Terms --- p.8
Chapter 1.2.3 --- Hypotheses --- p.10
Chapter 1.2.4 --- Significance of The Study --- p.11
Chapter CHAPTER TWO --- REVIEW OF LITERATURE
Chapter 2.1 --- Benefits and Potential Disadvantages of Stretching --- p.12
Chapter 2.1.1 --- Benefits of Stretching --- p.12
Chapter (a) --- Muscle Relaxation --- p.12
Chapter (b) --- Performance Enhancement --- p.14
Chapter (c) --- Prevention of Injury --- p.17
Chapter (d) --- Increase of Range of Motion --- p.19
Chapter (e) --- Prevention of Muscle Soreness --- p.20
Chapter 2.1.2 --- The Potential Disadvantages of Stretching --- p.20
Chapter 2.2 --- Limiting Factors of Flexibility --- p.22
Chapter 2.2.1 --- Muscle --- p.22
Chapter (a) --- Histologic Components of Muscle --- p.22
Chapter (b) --- Muscular Elongation --- p.23
Chapter (c) --- The Effects of Immobilization --- p.23
Chapter 2.2.2 --- Connective Tissue --- p.24
Chapter (a) --- Collagen --- p.25
Chapter (b) --- Elastic Tissue --- p.27
Chapter (c) --- Tissue Composed of Connective Tissue --- p.27
Chapter 2.2.3 --- The Mechanical Properties of Soft Tissue --- p.30
Chapter 2.2.4 --- "Age, Gender, Physical Activity and Temperature" --- p.33
Chapter 2.3 --- Neurophysiology of Stretching --- p.34
Chapter 2.3.1 --- Muscle Spindles and Golgi Tendon Organs --- p.34
Chapter (a) --- Structure and Role of Muscle Spindle --- p.35
Chapter (b) --- Structure and Role of Golgi Tendon Organs --- p.38
Chapter (c) --- Parallel and Series End Organs --- p.38
Chapter 2.3.2 --- Electromyography --- p.39
Chapter 2.4 --- Hamstrings --- p.43
Chapter 2.4.1 --- Functions of Hamstrings --- p.43
Chapter 2.4.2 --- Limited Range of Motion in Hamstrings --- p.45
Chapter 2.4.3 --- Measurement of Hamstrings Flexibility --- p.46
Chapter 2.5 --- Stretching Protocol --- p.50
Chapter 2.5.1 --- Modes of Stretching --- p.50
Chapter 2.5.2 --- Intensity of Stretching --- p.53
Chapter CHAPTER THREE --- METHOD
Chapter 3.1 --- Subjects --- p.55
Chapter 3.2 --- Instrumentation --- p.57
Chapter 3.3 --- Procedure --- p.60
Chapter 3.4 --- Reliability Study --- p.69
Chapter 3.5 --- Data Analysis --- p.70
Chapter CHAPTER FOUR --- RESULTS
Chapter 4.1 --- Reliability Study --- p.72
Chapter 4.2 --- Experimental Study --- p.73
Chapter 4.2.1 --- Range of Motion of Pre-Test and Post-Test --- p.74
Chapter 4.2.2 --- Passive Resistance of Pre-Test and Post-Test --- p.75
Chapter 4.2.3 --- Subjective Rating of Pre-Test and Post-Test --- p.76
Chapter 4.2.4 --- Myoelectric Activities of Hamstrings of Pre-Test and Post-Test --- p.76
Chapter 4.2.5 --- Hamstrings Performance of Pre-Test and Post-Test --- p.79
Chapter 4.2.6 --- Range of Motion Difference among Trained and Untrained Groups --- p.81
Chapter 4.2.7 --- Passive Resistance of Hamstrings Difference among Trained and Untrained Groups --- p.82
Chapter 4.2.8 --- Subjective Rating of Perceived Stretch Difference among Trained and Untrained Groups --- p.82
Chapter 4.2.9 --- Myoelectric Activities of Hamstrings Difference among Trained and Untrained Groups --- p.83
Chapter 4.3.0 --- Performance of Hamstrings Difference among Trained and Untrained Groups --- p.83
Chapter CHAPTER FIVE --- DISCUSSION
Chapter 5.1 --- Hamstrings Flexibility Analysis --- p.92
Chapter 5.2 --- Hamstrings Passive Resistance Analysis --- p.94
Chapter 5.3 --- Rating of Perceived Stretch Analysis --- p.97
Chapter 5.4 --- Hamstrings Myoelectric Activities Analysis --- p.98
Chapter 5.5 --- Hamstrings Performance Analysis --- p.100
Chapter 5.6 --- Limitations and Suggestions --- p.102
Chapter 5.7 --- Conclusions --- p.103
REFERENCES --- p.105
APPENDIX
Appendix A. Informed Consent
Appendix B. Personal Particulars and Past Medical History Screening Sheet
Appendix C. Perceived Stretch Rating Scale
Appendix D. Record Sheet

M.Tech. (Chiropractic)
Purpose: The aim of this comparative study was to compare the effects of spinal adjustment with static passive stretch to the cervical spine, and spinal adjustment with proprioceptive neuromuscular facilitation to the cervical spine in the treatment of chronic posterior neck pain with regards to pain, disability and cervical spine range of motion. These effects were based on a questionnaire consisting of a Numerical Pain Rating Scale, a Vernon-Mior Neck Pain and Disability Index Questionnaire, and on cervical spine ROM readings taken using an analogous cervical spine ROM inclinometer. The questionnaire was completed and the ROM readings taken prior to treatment at the first, fourth and seventh consultation. Method: Thirty participants who met the inclusion criteria were randomly diversified in number and gender between two groups of equal size (15 participants each). Group one received spinal adjustment/s to restricted cervical spine joints followed by static passive stretching. The second group received spinal adjustment/s to restricted cervical spine joints followed by proprioceptive neuromuscular facilitation. Participants were treated six times out of a total of seven sessions, over a maximum three week period. Procedure: Subjective data was collected at the beginning of the first and fourth consultations, as well as on the seventh consultation by means of a Numerical Pain Rating Scale (NPRS) and a Vernon-Mior Neck Pain and Disability Questionnaire in order to assess pain and disability levels. Objective data was collected at the beginning of the first and fourth session, as well as on the seventh consultation by means of a cervical spine range of motion inclinometer in order to assess cervical spine range of motion. Analysis of collected data was performed by a statistician. Results: Clinically significant improvements in group 1 and group 2 were noted over the duration of the study with reference to pain, disability, and cervical spine range of motion. Statistically significant changes were noted in group 1 and group 2 with reference to pain, disability, and cervical spine range of motion over time except for cervical spine extension range of motion.