Dissertations / Theses on the topic 'Neuromuscular fatigue'
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St, Clair Gibson Alan. "Fatigue, aging and the neuromuscular system." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/3205.
Full textThe aim of this thesis was to investigate the relationship between chronic exercise activity, aging, the neuromuscular system and the symptom of fatigue in a series of studies. The hypothesis of the thesis was that in contrast to the accepted dogma that exercise is beneficial to an individual, increasing longevity and improving quality of life, excessive or chronic exercise activity may accelerate the aging process, lead to neuromuscular damage, and cause the development of pathological symptoms or levels of fatigue.
Taylor, Kristie-Lee. "Monitoring neuromuscular fatigue in high performance athletes." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2012. https://ro.ecu.edu.au/theses/581.
Full textLin, Zengyuan. "Neuromuscular fatigue following a singles badminton match." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2014. https://ro.ecu.edu.au/theses/1279.
Full textAlahmari, Sami Khaloufah M. "Muscle force production and neuromuscular fatigue responses to neuromuscular electrical stimulation and tendon vibration." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/236174/1/Sami_Alahmari_Thesis.pdf.
Full textLloyd, Alex. "Neuromuscular fatigue, muscle temperature and hypoxia : an integrative approach." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/21766.
Full textYang, Qi. "BIO-SIGNAL ANALYSIS IN FATIGUE AND CANCER RELATED FATIGUE: WEAKENING of CORTICOMUSCULAR FUNCTIONAL COUPLING." Cleveland, Ohio : Cleveland State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=csu1213888265.
Full textAbstract. Title from PDF t.p. (viewed on Oct. 8, 2008). Includes bibliographical references (p. 91-99). Available online via the OhioLINK ETD Center. Also available in print.
Reed, Georgina. "The effect of neuromuscular training on fatigue resistance in female footballers." Thesis, University of Gloucestershire, 2017. http://eprints.glos.ac.uk/5285/.
Full textCormack, Stuart J. "Neuromuscular fatigue and endocrine responses in elite Australian rules football players." Connect to thesis, 2008. http://portal.ecu.edu.au/adt-public/adt-ECU2008.0010.html.
Full textBERETTA-PICCOLI, MATTEO CARLOFELICE. "EVALUATION OF NEUROMUSCULAR FATIGUE THROUGH INNOVATIVE SURFACE EMG PARAMETERS IN HUMANS." Doctoral thesis, Università degli studi di Pavia, 2020. http://hdl.handle.net/11571/1371980.
Full textCastronovo, Anna Margherita <1984>. "Techniques and Methods for a multi-scale analysis of neuromuscular fatigue." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6274/7/Castronovo_AnnaMargherita_tesi.pdf.
Full textCastronovo, Anna Margherita <1984>. "Techniques and Methods for a multi-scale analysis of neuromuscular fatigue." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6274/.
Full textOverton, Amanda Julie. "Neuromuscular Fatigue and Biomechanical Alterations during High-Intensity, Constant-Load Cycling." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2013. https://ro.ecu.edu.au/theses/612.
Full textCormack, Stuart J. "Neuromuscular fatigue and endocrine responses in elite Australian Rules football players." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2008. https://ro.ecu.edu.au/theses/19.
Full textPiponnier, Enzo. "Etude des différences de fatigue neuromusculaire entre enfants et adultes en fonction du groupe musculaire, de la longueur musculaire et du profil métabolique." Thesis, Université Clermont Auvergne (2017-2020), 2018. http://www.theses.fr/2018CLFAS013/document.
Full textThe aims of this PhD thesis were to evaluate the effects of differences of (i) force level, throughout different muscle groups and muscle lengths, and (ii) metabolic profile on the differences of development and etiology of the neuromuscular fatigue between prepubertal children and adults, as well as (iii) to improve our knowledge of the mechanisms of neuromuscular fatigue in children. The results of this PhD thesis showed that force level differences could be a factor underpinning the differences in the development and etiology of neuromuscular fatigue between children and adults. However, this factor cannot fully account for differences in fatigue between both populations. Indeed, our results also highlighted that metabolic profile differences could explain the difference of development and etiology of neuromuscular fatigue between children and adults. Additionally, the results of this thesis showed that children exhibit lower peripheral fatigue and greater central fatigue than adults after an intermittent maximal exercise. This lower peripheral fatigue was associated with a lower alteration of the contractile properties and excitation-contraction coupling, and a better adaptation of the muscle oxygenation in prepubertal children. Our results suggest that spinal fatigue could not explained the differences in central fatigue between children and adults, and that the greater central fatigue in children could be attributed to a greater supra-spinal fatigue
Kennedy, Ashley C. "Impact of Neuromuscular Fatigue on the Postural Response to Externally Initiated, Predictable Postural Perturbations." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24369.
Full textVaughan, Jeremiah A. "Neuromuscular Function and Fatigue and Metabolic Responses while Cycling in the Heat." Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1542212848069694.
Full textCardwell, Kathryn. "The assessment of movement demands and neuromuscular fatigue in female softball players." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2022. https://ro.ecu.edu.au/theses/2501.
Full textFontes, Eduardo Bodnariuc 1979. "Limiar de fadiga neuromuscular determinado por diferentes periodos de analise do sinal eletromiografico." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/275157.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Educação Fisica
Made available in DSpace on 2018-08-10T17:31:59Z (GMT). No. of bitstreams: 1 Fontes_EduardoBodnariuc_M.pdf: 546789 bytes, checksum: e5cf58e2e5bc2c9f182d7e783137819d (MD5) Previous issue date: 2008
Resumo: LFNM estabelecido por diferentes períodos de análise do sinal eletromiográfico e comparar os mesmos com a Potência Crítica - PC em indivíduos saudáveis. A amostra foi composta por 17 voluntários saudáveis do sexo masculino (23,4 ± 5,2 anos, 73,6 ± 5,08 kg, 177,8 ± 7,0 cm). Para determinar o LFNM, cada sujeito realizou entre três e quatro cargas constantes no cicloergometro (modelo Corival 400, Quinton Inc, USA) até a exaustão voluntária, com cadência de 60 rpm. Utilizando um eletromiógrafo de 16 canais (MP150, Biopac Systems, Inc., USA), foram coletados sinais EMG do músculo Vasto Lateral. O LFNM foi calculado pelo modelo matemático proposto por (DEVRIES et al., 1982), no qual a taxa de aumento do sinal eletromiográfico atingido durante as cargas constantes é plotado em função das respectivas cargas, sendo o intercepto ¿y¿ do prolongamento desta reta considerado o LFNM. Tal procedimento foi reproduzido para cada um dos tempos de duração de análise, 30 segundos (T30s), um minuto (T1min), dois minutos (T2min) e tempo total (TTotal). PC foi determinada através do modelo hiperbólico. Utilizando a potência de LFNM encontrada por TTotal, foi verificado ainda a capacidade dos voluntários de permanecer em teste retangular de 30 min, sem evidência de fadiga neuromuscular. Foram encontradas diferenças significativas entre os períodos de análise para determinação de LFNM (ANOVA). Utilizando T30s a média alcançada foi 266,7 ± 23,1 W, com T1min ficou em 243,4 ± 16,2 W, para T2min obteve 232,6 ± 18,3 W, e utilizando TTotal a média foi de 217,2 ± 23,1 W, já para PC, foi encontrado valores médios de 177,9 ± 27,3 W. Foram encontradas diferenças estatisticamente significantes entre T30s e todos os outros períodos de análise, T1min, T2min e TTotal (p<0,01). O LFNM determinado com T1min, foi diferente estatisticamente também de TTotal (p<0,01). Todos os períodos de análise utilizados para determinar LFNM superestimaram estatisticamente PC (p<0,01). Foi encontrada correlação significativa apenas para TTotal e PC (R2 = 0,72). Durante o protocolo de carga retangular de 30 minutos, a média da exaustão ocorreu em 661,6 ± 303,9 segundos, apenas um dos voluntários completou os teste de 30 minutos. O nível de significância adotado para todas as análises foi de 5%. A partir dos resultados do presente estudo, é possível concluir que o tempo de análise influencia na determinação de LFNM, superestimando PC e a capacidade de adultos jovens em realizar exercícios de carga constante de 30 minutos em cicloergômetro
Abstract: The purpose of this study was to establish the Neuromuscular Fatigue Threshold - LFNM determinied by different analysis periods of electromyography sign and compare to the Critical Power - CP in healthy young men. 17 healthy men volunteers (23,4 ± 5,2 years, 73,6 ± 5,08 kg, 177,8 ± 7,0 cm) completed three or four constant loads tests on a cycling ergometer to establish LFNM (model Corival 400, Quinton Inc, USA) until exhaustion, and the pedal cadence was 60 rpm. Using an amplifier with 16 channels (MP150, Biopac Systems, Inc., USA), were collected EMG signs from Vastus Lateralis muscle from the dominant side. The LFNM were calculated by the mathematical model proposed by DeVries et al., (1982) where the LFNM was considered the y intercept of the regression line the EMG slopes from contant load tests plotted against its respective load. CP was calculated using the hyperbolic equation model. The LFNM procedure was done by each period of EMG analysis 30 seconds (T30s), one minute (T1min), two minutes (T2min) and total period (TTotal). Using LFNM established by TTotal, were verified the capacity of the volunteers to complete a 30 minutes constant load test, without neuromuscular fatigue. ANOVA found statistical differences between analysis periods. Using T30s, the mean found were 266,7 ± 23,1 W, with T1mn were 243,4 ± 16,2 W, for T2min were 232,6 ± 18,3 W, and with TTotal, the mean were 217,2 ± 23,1 W, however, for CP were found 177,9 ± 27,3 W. Were found statistical differences between T30s and all the others analysis periods, T1min, T2min and Total (p<0,01). The LFNM established by T1min were also different from TTotal (p<0,01). All the analysis periods overestimated PC (p<0,01). Were found significant correlation between only PC and TTotal (R2 = 0,72). During the 30 minutes constant load test completed, the exhaustion mean time were 661,6 ± 303,9 seconds, and only one volunteer completed all the 30 minutes. The significance level adopted for all analysis was 5%. According to the results of this study, it is possible to conclude that the analysis periods influences the determination of LFNM, and it overestimates CP and the capacity of the healthy adults to complete a 30 minutes constant load test in cycling ergometer
Mestrado
Ciencia do Desporto
Mestre em Educação Física
Santos, Denise Veck dos. "Análise das variáveis biomecânicas em mulheres ativas após aplicação de um protocolo de fadiga /." Rio Claro, 2019. http://hdl.handle.net/11449/191096.
Full textResumo: No cenário esportivo a avaliação de padrões de movimentos é indispensável para melhoria do desempenho, prevenção e recuperação de lesões. Dentre as variáveis que podem ser estudadas, a Eficiência Neuromuscular (ENM) vem ganhando espaço no meio acadêmico devido à sua importância para compreender como os fatores neurais interferem na eficácia da ativação das unidades motoras durante a contração muscular. A eficiência neuromuscular está relacionada à ativação de fibras musculares e à produção de força, gerada por um determinado músculo. Um dos fatores que podem interferir na ENM comprometendo as ações durante as diferentes práticas desportivas é a fadiga. A fadiga pode ser considerada como uma falha para manter um nível desejado de desempenho ou trabalho durante uma atividade repetitiva ou sustentada. O objetivo do presente estudo é analisar variáveis neuromusculares em mulheres ativas após a aplicação de um protocolo de fadiga e verificar a diferença na dominância entre membros inferiores. Participaram do estudo 20 mulheres ativas, com idade entre 18 e 35 anos. O estudo foi divido em 2 experimentos. No primeiro experimento foram realizados testes de contração isométrica voluntária máxima e manutenção de cargas (20%, 40%, 60% e 80% da CIVM) no membro dominante. Após a avaliação as voluntárias foram submetidas a um protocolo de fadiga. Os testes foram refeitos imediatamente após para analisar o efeito da fadiga nas variáveis da eficiência neuromuscular, no desvio padrão e coefici... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: In the sports scenario, the evaluation of movement patterns is indispensable for performance improvement, injury prevention and recovery. Among the variables that can be studied, the Neuromuscular Efficiency (ENM) has been gaining ground in the academic environment due to its importance to understand how the neural factors interfere in the effectiveness of motor unit activation during muscle contraction. Neuromuscular efficiency is related to the activation of muscle fibers and the production of force generated by a given muscle. One of the factors that can interfere with ENM compromising actions during different sports is fatigue. Fatigue can be considered a failure to maintain a desired level of performance or work during a repetitive or sustained activity. The aim of the present study is to analyze neuromuscular variables in active women after the application of a fatigue protocol and to verify the difference in lower limb dominance. The study included 20 active women, aged between 18 and 35 years. The study was divided into 2 experiments. In the first experiment, maximum voluntary isometric contraction tests and load maintenance (20%, 40%, 60% and 80% of MVIC) were performed on the dominant limb. After the evaluation, the volunteers were submitted to a fatigue protocol. The tests were redone immediately afterwards to analyze the effect of fatigue on neuromuscular efficiency variables, standard deviation and coefficient of variation. In the second experiment, voluntary max... (Complete abstract click electronic access below)
Mestre
Hoeven, Johannes Harmen van der. "Conduction velocity in human muscle an EMG study in fatigue and neuromuscular disorders /." [S.l. : [Groningen] : s.n.] ; [University Library Groningen] [Host], 1995. http://irs.ub.rug.nl/ppn/142995223.
Full textForsberg, Josefin. "Muscle fatigue and neuromuscular knee valgus in strong versus weak young female athletes." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-33981.
Full textBakgrund. Knäskador såsom främre korsbandsskada (ACL) är vanliga hos unga idrottande kvinnor och bidrar till höga medicinska kostnader och personligt lidande. Knävalgus och muskelutmattning har var för sig visat sig öka risken för knäskador hos kvinnor, medan styrketräning har rapporterats kunna minska förekomsten av knävalgus och risken för skada. Emellertid finns få studier som undersöker effekterna av muskelstyrka och utmattning på knävalgus. Syfte. Studien syftar till att undersöka huruvida styrka påverkar förekomsten av knävalgus och om muskulär trötthet påverkar knävalgus olika beroende på nivå av muskelstyrka hos unga idrottande kvinnor. Metod. Tjugo unga kvinnliga idrottare deltog i studien, ålder 18,15 (±0,79). Ett enbenshopp, vilket filmades med videokamera, användes för att utvärdera knävalgus och en repetition maximum (1RM) i knäböj för att bestämma maximal muskelstyrka. Ett utmattningsprotokoll användes för att åstadkomma muskeltrötthet. Genom att dela styrkevariabeln, 1 RM testet, vid medianen delades försökspersonerna in i två grupper; starka och svaga. Samtliga försökspersoner testade både höger och vänster ben innan och efter utmattning. Resultat. Resultaten visade ingen signifikant skillnad mellan stark och svag grupp gällande graden av knävalgus, i varken höger (p= 0,6) eller vänster (p= 0,97) ben före utmattning. Inte heller var det någon skillnad mellan stark och svag grupp efter utmattning (höger ben, p= 0,11, vänster ben, p= 0,36). Inte heller kunde någon signifikant skillnad konstateras angående utmattningens effekt på knävalgus beroende på styrka, stark/svag (höger ben, p= 0,5, vänster ben, p= 0,38). Slutsats. Sammanfattningsvis verkar det inte föreligga någon skillnad i förekomst av knävalgus mellan starka och svaga individer. Således verkar det som att muskelstyrka saknar betydelse för knävalgus hos unga kvinnliga idrottare. Vidare verkar inte heller utmattning påverka knävalgus hos varken starka eller svaga unga kvinnliga idrottare. Studien har begränsat antal deltagare och fler studier krävs.
Riding, Teri J. "Contributions of muscle fatigue to a neuromuscular neck injury in female standard ballroom dancers /." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1529.pdf.
Full textTheilen, Nicholas Todd. "Comparisons of acute neuromuscular fatigue and recovery after maximal effort strength training using powerlifts." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4593.
Full textPethick, Jamie. "The effects of neuromuscular fatigue on the complexity of isometric torque output in humans." Thesis, University of Kent, 2016. https://kar.kent.ac.uk/60067/.
Full textRiding, Teri. "Contributions of Muscle Fatigue to a Neuromuscular Neck Injury in Female Standard Ballroom Dancers." BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/755.
Full textGarnier, Yoann. "Influence des modalités de contraction musculaire sur les effets neuroplastiques de l'exercice." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCK034/document.
Full textAlong with cardiovascular and neuromuscular changes, mono-articular and locomotor exercises may induced neuroplastic changes from muscles involved, or non-involved, in the exercise. If the effect of exercise intensity or duration on neuroplastic changes has been previously investigated, the effect of the mode of muscle contraction remains unclear. The aim of this thesis was to investigate the effects of the mode of muscle contraction on neuroplastic changes induced a locomotor or a single-joint exercise. The first study showed that the increase in the corticospinal excitability of a non-exercised hand muscle, observed after a walking/ running exercise, was not modulated by the knee extensors mode of muscle contraction. However, a specific modulation of the intracortical networks by the mode of muscle contraction was evidenced using a paired-associative stimulation protocol. Similar findings were made in a second study that investigated corticospinal changes in the knee extensors following a fatiguing single-joint exercise, performed in either a concentric or an eccentric mode of muscle contraction. A third study showed that for a walking/ running exercise performed at the same heart rate in either a inline, a level or a decline condition, the latter condition induced a greater magnitude of neuromuscular fatigue of the knee extensors, with greater contractile impairments. The fourth study reported that only a decline exercise induced an increase in the corticospinal excitability, and a reduction of the cortical inhibition of the knee extensors. Altogether, findings from this thesis suggest that the mode of muscle contraction during an exercise is not, per se, a main factor responsible for neuroplastic changes observed in exercised muscles. Rather, these changes may depend upon the magnitude of neuromuscular fatigue induced, which could depend upon the mode of muscle contraction involved during exercise
Dwyer, Daniel, and na. "Serotonin as a Mediator of Fatigue During Exercise and Training." Griffith University. School of Health Science, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040521.130535.
Full textDwyer, Dan. "Serotonin as a Mediator of Fatigue During Exercise and Training." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/366705.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Health Sciences
Full Text
Followay, Brittany. "EFFECTS OF CYCLING EXERCISE AND COLD EXPOSURE ON NEUROMUSCULAR ACTIVATION AND FATIGUE,AND METABOLIC RESPONSES." Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1531736690094866.
Full textCometti, Carole. "Effets de différents paramètres de récupération lors d'exercices de renforcement musculaire." Thesis, Dijon, 2012. http://www.theses.fr/2012DIJOS014/document.
Full textThe high frequency of resistance training sessions induces heavy strain and fatigue phenomenon, which could be prejudicial for subsequent performance. In this context, it appears necessary to apply proper recovery strategies in order to improve the athlete’s ability to regain an adequate working state for subsequent training.Active recovery is widely described in the literature as the most efficient method for this purpose. It consists in low-intensity exercises, which could improve metabolites washout by increasing peripheral blood flow. To our knowledge, active recovery is usually applied globally, with exercises involving the whole body (light pedalling or running) but little is known regarding a local application after analytical exercises such as strengthening exercise. The aim of our research was therefore to determine the most effective method to recover from resistance training session in terms of maximal strength performance. Among the active recovery modes, electromyostimulation (EMS) is of particular interest since it can be applied on specific muscles groups. Our results showed that active recovery using EMS applied during a session (between the sets) or after a session, did not demonstrate any difference as compared with passive recovery. Also, we demonstrated that EMS was not more efficient when applied distally. However, we highlighted that the investigation of neuromuscular parameters is necessary to better understand the origin of the fatigue induced by a specific exercise in order to apply the most appropriated recovery mode
Bray, James William. "Quantification of training load, neuromuscular fatigue, biochemical and endocrine responses to fast bowling in cricket." Thesis, University of Hull, 2017. http://hydra.hull.ac.uk/resources/hull:16447.
Full textFell, Neil. "Neuromuscular and metabolic characteristics of fatigue in response to heavy resistance and dynamic strength training." Thesis, Liverpool John Moores University, 2004. http://researchonline.ljmu.ac.uk/5601/.
Full textVitry, Florian. "Effets aigus et chroniques de l’électrostimulation appliquée au niveau du nerf moteur : importance du retour afférent." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCK087.
Full textThe aim of this thesis was to investigate the effects of electrical stimulation protocols favouring an indirect motor units’ (MU) recruitment via sensory axons activation and giving rise to extra force development, on the neuromuscular system. These protocols use wide pulse duration, low stimulation intensity, low and high stimulation frequencies and are applied over the motor nerve. The aim of the first study was to examine the effects of these protocols on the extent and origin of neuromuscular fatigue during an acute application. Results showed that for a similar impact on maximal force generating capacity, low stimulation frequencies limit force decreases during the stimulation trains as compared to high stimulation frequencies. The aim of the second study was to investigate the effects of chronic application of these protocols. Results showed important torque gains after the training period despite the low stimulation intensity used, while the induced neural adaptations were frequency-dependent. Results of these two studies also highlighted the importance of the phenomenon of extra torque on induced adaptations. Thus, the aim of the third study was to determine the conditions permitting the occurrence of extra torque, by modulating the frequency and intensity of stimulation. Main results showed that when the initial MU recruitment was mostly indirect, the developed torque was higher than the one expected for the given stimulation parameters, independently of the stimulation frequency, suggesting that the indirect MU recruitment plays a preponderant role in the occurrence of extra torque. Moreover, a frequency-dependent impact on spinal excitability was observed, resulting in a decrease after the low stimulation frequency and an increase after the high frequency. Consequently, the last study investigated the mechanisms responsible for the distinct modulation of spinal excitability. Results showed that the decrease in spinal excitability observed after the low stimulation frequency could be attributed to increased homosynaptic post-activation depression, while this latter mechanism could have been compensated by an enhanced motoneuron excitability as a result of persistent inward currents after the high stimulation frequency. All these results underline the importance of the afferent volley to the induced neuromuscular adaptations after acute and chronic electrical stimulation application
Emerson, Nadia. "The Effects of 6-weeks of Resistance Training on the Neuromuscular Fatigue Threshold in Older Adults." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5631.
Full textM.S.
Masters
Child, Family, and Community Sciences
Education and Human Performance
Sport and Exercise Science; Applied Exercise Physiology
Morgan, P. "The effect of acute consumption of non-specific COX-inhibitors on neuromuscular fatigue and exercise performance." Thesis, University of Exeter, 2019. http://hdl.handle.net/10871/36529.
Full textEladly, Ahmed Fayed. "Applicability of wireless injectable microstimulators based on volume conduction for high density neuromuscular stimulation." Doctoral thesis, Universitat Pompeu Fabra, 2021. http://hdl.handle.net/10803/671529.
Full textNanjundeswaran, (Guntupalli) Chaya D., Jessie VanSwearingen, and Katherine Verdolini Abbott. "Metabolic Mechanisms of Vocal Fatigue." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etsu-works/1761.
Full textBisson, Etienne. "Influence of Neuromuscular Fatigue of the Lower Limb on Postural Control and Associated Central Processes in Young and Older Adults." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23612.
Full textDuan, Xu. "Influence of gender and obesity on motor performance, neuromuscular control and endurance in older adults." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/91479.
Full textMS
Blaisdell, Robert B. "Effects of Neuromuscular Fatigue Resulting from Repeat Sprint Exercise Among Trained Cyclists on Measures of Strength and Power Performance." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/etd/3621.
Full textBotelho, André Luís. "Avaliação da fadiga neuromuscular por meio da análise de frequência do sinal eletromiográfico de sujeitos controle e pacientes acometidos por disfunção temporomandibular tratados com placa oclusal resiliente e rígida." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/58/58133/tde-22052012-155242/.
Full textThe repeated failure to produce in time a certain level of strength or muscle power is called neuromuscular fatigue. The etiology of muscle fatigue has attracted the interest of researchers for over a century. However, their agents and local definitive remain yet to be identified. This work aimed to evaluate neuromuscular fatigue by frequency analysis of the electromyographic signal of the masseter and anterior temporal muscles of both sides in three different groups: healthy subjects asymptomatic for temporomandibular disorders (TMD), patients suffering from TMD treated with resilient occlusal splint and patients suffering from TMD treated with rigid occlusal splint. For this, 100 subjects asymptomatic for TMD participated in the survey and 30 patients with TMD subdivided into 2 groups: treated with rigid splint type FARC, and treated with resilient splint. All electromyographic examinations performed before and after treatment with occlusal splint. The results showed that statistically significant differences when comparing the rate of fatigue assessed before and after treatment with occlusal appliance, for both groups. There was a decrease in the rate of fatigue after treatment with occlusal splint to the left masseter and right anterior temporal in the group Soft Splint; and decrease in the rate of fatigue after treatment for left anterior temporal muscle to the group FARC Splint. It can be concluded that treatment with both types of occlusal splint was effective in reducing the rate of neuromuscular fatigue in patients affected by TMD.
Giandolini, Marlène. "Gestion de l'impact et de la fatigue neuromusculaire en trail running." Thesis, Saint-Etienne, 2015. http://www.theses.fr/2015STET009T/document.
Full textAlthough Humans are “born” anatomically and physiologically adapted to long distances run, they are substantially exposed to various musculoskeletal overuse injuries. Trail runners sustain a high number of foot-to-ground contacts and develop severe muscle fatigue and damages. Repetitive shocks and muscle damages would reduce the runners’ tolerance to mechanical strains leading to changes in running kinematics. Minimizing musculoskeletal damages is therefore considered paramount for performance in trail running. Numerous studies highlighted that the foot strike pattern alters the localization and magnitude of the mechanical strains applied on the musculoskeletal system. The main purpose of this thesis was to study the influence of the foot strike pattern on impact and neuromuscular fatigue in trail running. Downhill sections were mainly investigated since they are the most mechanically stressful. Indeed, it was observed from this thesis’ work that, in real trail running practice, the impact intensity increases as the slope decreases, and that the neuromuscular fatigue induced by a single downhill run is as severe as the one induced by an ultratrail race that lasts several hours. Investigating the effect of the foot strike pattern adopted during a downhill trail run on fatigue, it was observed that forefoot striking increases the neuromuscular fatigue at knee extensors. However, a high variability in foot strike patterns adopted was associated to a lower neuromuscular fatigue at both knee extensors and plantar flexors. The effect of the foot strike pattern on axial and transversal shock and vibration content was also demonstrated: heel striking was correlated to a lower impact severity along the axial axis of the skeleton but a greater one along its transversal axis. The main conclusion of this thesis is that no single foot strike pattern should be universally advised due to “changing of foot strike” means “changing the localization and magnitude of the mechanical stress applied on the musculoskeletal system”. Switching between different running patterns might be an efficient strategy in trail running
Brandon, Raphael. "Investigations of the neuromuscular response during and following elite maximum strength and power type resistance exercise." Thesis, University of Stirling, 2011. http://hdl.handle.net/1893/3655.
Full textTorrado, Pineda Priscila. "Valoración de la fatiga neuromuscular en el antebrazo del motorista de velocidad." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/311797.
Full textDuring a motorcycle race fatigue levels are high as riders are required to endure high levels of muscle tension for long periods of time, especially in their arms and forearms. For this reason the present thesis focuses on fatigue in the right forearm muscles. In the first study we compared an intermittent fatigue protocol (IFP) especially designed for motorcycle riders with a continuous protocol. The IFP was not only able to discriminate between the riders and the control group, but also proved to have a strong relationship with the level of motorcyclist forearm discomfort. Despite the results obtained with continuous protocol were similar to those reported in the literature, our IFP confirmed the discrepancies between studies suggesting that the combination of different, contraction-relaxation periods, submaximal contraction intensities (% maximal voluntary contraction, MVC), muscle groups and other non-controlled or non-reported factors, are critical to understand muscle fatigue in IFPs. The above mentioned results invited us to investigate the effects of two different recovery periods and two intensities on the EMG signal in the study II, using a unique IFP. The results suggested that using short recovery periods and low intensities is the best approach to evoke fatigue. In study Ill, time course parameters of contraction and relaxation were examined to better characterize the reduction in the maximal force generating capacity of a muscle (MVC) during an IFP specifically designed for road racing motorcycle riders. Also, a mathematical nonlinear force fatigue model was proposed and confirmed a satisfactory adjustment to all participants. The same mathematical expression derived three patterns of force fatigue : three-phase , exponential and linear. Finally, in the fourth study which purpose was to investigate the contribution of central and peripheral mechanisms of fatigue on the exerted and contralateral extensor digitorum communis following an IFP, we examined the time-course of recovery of maximal voluntary contraction (MVC), compound muscle action potential (CMAP), motor evoked potential (MEP) to transcranial magnetic stimuli and the cortical silent period (CSP) throughout 20 min of recovery. The results suggested that local factors were those mainly responsible for the incomplete MVC recovery after the IFP.
Souissi, Hiba. "Altération des stratégies musculaires chez des patients post-AVC : conséquences sur la marche et en condition de fatigue." Thesis, Côte d'Azur, 2018. http://www.theses.fr/2018AZUR4213/document.
Full textHemiparesis is one of the most frequent deficits after stroke. It is accompanied by an abnormal muscle co-contraction pattern and an altered force production that significantly contribute to reduced gait performance. These alterations lead to a reorganization of muscle coordination patterns to ensure stability and adjust the propulsion of the center of mass during walking. However, less is known about muscle actions in the paretic and non-paretic lower limbs during walking. In addition, co-contraction patterns were evaluated from only EMG data in post-stroke patients. Furthermore, post-stroke patients manifest higher levels of fatigability than healthy individuals. While several factors are involved in fatigue, the role of co-contraction remains poorly understood. The main objective of this thesis was to characterize the alterations of the muscle strategies of the lower limbs in post-stroke hemiparetic patients during walking and during fatigue induced by isokinetic concentric maximal contractions. This thesis introduces the novel use of an EMG-driven modelling approach to measure muscle forces generated around the knee and ankle joints of the paretic and non-paretic lower limbs during gait in post-stroke patients. In addition, we have shown that quantification of co-contraction from muscle moments is preferable compared to EMG measurements. The results showed that the reduced forces exerted by the plantar-flexors and the knee-extensors on the paretic side, gives a possible explanation for hemiparetic gait abnormalities. Increased forces generated by the knee-flexor and knee-extensor muscles on the non-paretic side, as well as increased force generated by the knee flexors on the paretic side, compared to healthy subjects, during the stance phase would be a behavioral reorganization to better support body weight and properly adjust the forward center of mass. This reorganization of muscle coordination patterns is also reflected by the increased levels of co-contraction (based on muscle moments) observed on the paretic and non-paretic side during walking. This seems to be an adaptive, compensatory strategy to ensure postural stability. However, increased co-contraction during walking can contribute to an increased energy cost in patients and lead to a more rapid fatigue development. The study of neuromuscular fatigue in post-stroke patients showed less fatigability compared to healthy subjects, in the presence of a higher level of co-contraction (based on EMG data). Decreasing agonist EMG during repeated concetric contractions, occurred in parallel with decreasing antagonist EMG, reducing the relative opposing force and resulting in a less decline in net torque. This seems to be a potential mechanism by which net torque output is preserved in post-stroke patients who are inherently weaker. The results of these studies underline the importance of developing rehabilitation programs focused on the strengthening of plantar flexors and knee extensors and on the selectivity of movement control, such as power training
CERQUEIRA, Mikhail Santos. "Exercício de preensão manual isométrico intermitente associado a diferentes níveis de compreensão vascular externa: efeitos agudos na reposta neuromuscular." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/18734.
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Introdução: Exercícios de baixa intensidade executados até a falha podem gerar hipertrofia e aumento de força muscular, porém o tempo até a falha (TF) pode ser muito prolongado e consequentemente gerar sobrecarga articular, sendo a restrição do fluxo sanguíneo (RFS) uma alternativa para reduzir o TF durante o exercício. A fadiga neuromuscular após o exercício pode ser indicada por uma redução na capacidade de produzir força e por alterações no sinal de eletromiografia (EMG), entretanto poucos estudos têm analisado essas variáveis após o exercício com RFS realizado até a falha. Objetivo: Verificar os efeitos de diferentes níveis de RFS aplicados durante um exercício de preensão manual isométrico intermitente (EPMII) no TF, na recuperação da força isométrica voluntária máxima (FIVM), da frequência mediana (EMGFmed) e do pico do sinal de EMG bruto (EMGpico) após a falha. Métodos: Treze homens (21 ± 1,71 anos) realizaram o EPMII com 45% da FIVM até a falha com diferentes níveis de fluxo sanguíneo: oclusão total (OT), oclusão parcial (OP) e fluxo livre (FL). A pressão de oclusão foi determinada em repouso de forma individualizada. O TF foi avaliado durante o exercício. A FIVM, a EMGFmed e o EMGpico foram mensurados antes e nos minutos 1, 3, 5, 7, 9 e 11 depois do exercício. Resultados: O TF foi diferente (p<0,01) entre todas as situações investigadas: OT (150 ± 68 segundos), OP (390 ± 210 segundos) e FL (510 ± 240 segundos). A FIVM permaneceu reduzida onze minutos após a falha em todas as situações (p=0,001). Houve uma maior redução de força um minuto após a falha nas situações OP (-45,8%; p=0,001) e FL (-39,9%; p=0,005) em comparação à OT (28,1%). Após onze minutos de recuperação apenas na situação OP (-30,2%; p=0,004) a força foi menor que na situação OT (-21,7%). A situação OP gerou uma maior redução da EMGFmed nos minutos pós 5 (p=0,012) e pós 9 (p=0,034) em comparação à OT e maior elevação do EMGpico em relação a OT (p=0,008) e FL (p=0,034) após 7 e 9 minutos. Conclusões: Maiores níveis de oclusão vascular resultam em menor TF, exercícios com maior duração induzem maior redução de força após a falha e a aplicação de OP durante EPMII parece gerar maior fadiga neuromuscular.
Introduction: Low intensity exercises performed to failure can increased muscle strength and hypertrophy, but the time to failure (TF) can be very long and consequently generate joint overload. The blood flow restriction (BFR) can be an alternative to reduce the TF during exercise. Neuromuscular fatigue after exercise may be indicated by a reduction in the ability to produce force and changes in the electromyographic (EMG) signal, but few studies have examined these variables after exercise with BFR performed to failure. Objective: To investigate the effects of different vascular occlusion levels applied during intermittent isometric handgrip exercise (IIHE) in time to task failure (TF), recovery of maximum voluntary isometric force (MVIF), median frequency (EMGFmed) and peak raw EMG signal (EMGpeak) after failure. Methods: Thirteen men (21 ± 1,71 years) underwent IIHE with 45% of MVIF to failure with different levels of blood flow: total occlusion (TO), partial occlusion (PO) and free flow (FF). Occlusion pressure was determined individually at rest. The TF was evaluated during exercise. The MVIF, EMGFmed and EMGpeak were measured before and 1, 3, 5, 7, 9 and 11 minutes after exercise. Results: The TF was significantly different (p<0,01) among all investigated conditions: OT (150 ± 68 seconds), OP (390 ± 210 seconds) and FL (510 ± 240 seconds). The MVIF remained low eleven minutes after failure in all conditions (p=0,01). There was a greater reduction in force one minute after the failure in the situations PO (-45,8%; p=0,001) and FF (-39,9%; p=0,005) compared to TO (-28,1%). After eleven minutes of recovery only in the situation PO (-30,2%; p=0,004), the strength was lower than in the TO situation (-21,7%). The PO situation led to a greater reduction in EMGFmed after 5 (p=0,012) and 9 (p=0,034) minutes compared to TO and highest elevation of EMGpeak in relation to TO (p=0,008) and FF (p=0,034) after 7 and 9 minutes. Conclusions: Largest vascular occlusion levels result in lower TF, exercises lasting longer induce greater reduction of strength after the failure and the use of PO during IIHE seems to generate greater neuromuscular fatigue.
Cavalcante, Marcos David da Silva. "Efeitos da execução prévia do exercício físico e cognitivo sobre a estratégia de prova no ciclismo: um estudo acerca dos componentes centrais e periféricos da fadiga neuromuscular." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/39/39132/tde-15072016-095944/.
Full textThe aim of this study was to analyze the effects of previous execution of physical exercise and cognitive on the central and peripheral components of the neuromuscular fatigue during a 4 km cycling time trial. Eight trained cyclists (n = 8) participated of three different studies. In study 1, the athletes performed the 4 km cycling time trial test after watching a documentary (CON) or after a cognitive task (CT). In study 2, the 4-km cycling test was performed after 100 drop jumps (DJ), 48 hours after 100 drop jumps (48h-DJ) and without previous exercise (CON). In study 3, the time trial was performed after pre-fatigue of the upper (FU) and lower (FL) body and without prefatigue (CON). In all studies, central and peripheral fatigue parameters were evaluated via electrical stimulation in femoral nerve at rest, before and after 4km cycling. Study 1: Performance was similar (P> 0.05) between CON (376 ± 26.9 s) and TC (376.3 ± 26 s). Likewise, we found no significant differences (P> 0.05) for parameters of central and peripheral fatigue between CON and CT. Study 2: Performance was significantly (P< 0.05) impaired in DJ (-2.3%) and there was a trend in 48h-DJ (-1.8%). This reduction in performance in 48h-DJ was due to a lower power at first part of the time trial (P< 0.05). In DJ condition, loss in performance was due to lower power (P< 0.05) at the start and end phases of the test. There was exacerbated (P <0.05) peripheral fatigue after the time trial in DJ (1Hzpot = -44.7%) compared to CON (1Hzpot = 20.1%). Furthermore, a significant low frequency fatigue was observed in DJ compared to CON. On the other hand, central and peripheral fatigue parameters showed similar values between CON and 48h-DJ (P> 0.05). However, a significant increase in delayed onset muscle soreness was found in 48h-DJ than CON and DJ. Study 3: Performance was reduced in FU (-2.3%) and FL (-1.5%) compared to CON. The lowest performance was accompanied by a reduction in power (P< 0.05) in the initial (FL) and final (FL and FU phases of the time trial. After 4 km cycling, participants had a lower (P< 0.05) peripheral fatigue in FU (1Hzpot = -11.9%) compared with CON (1Hzpot = -20.1%). In FL, there was a greater peripheral fatigue compared to CON and FB condition. In conclusion, the results of these studies suggest that only the previous execution of exercise involving the muscles used in cycling causes changes in the peripheral components of the neuromuscular fatigue after 4 km of cycling
Doix, Aude-Clémence. "Stratégies d’activation neuromusculaires de la fatigue musculaire volontairement et électriquement induite : mécanismes sous-jacents et implications cliniques." Thesis, Nice, 2013. http://www.theses.fr/2013NICE4098/document.
Full textThe clinical care of muscle fatigue with exercise therapies aim at quality of life improvement and usually involve unilateral exercises or neuromuscular electrical stimulation to compensate impaired muscle function in both healthy and health-compromised people. Muscle fatigue is a decline in maximal force production, induced with exercising, whether or not the task can be maintained (Bigland-Ritchie et al. 1983a; Gandevia 2001a; Enoka and Duchateau 2008). The overall objective of this thesis was to study the effect of neuromuscular activation strategies during muscle fatigue, endurance and muscle performance after voluntary and electrically evoked contractions in healthy and health-compromised populations such as children with cerebral palsy (CP) and patients with facioscapulohumeral muscular dystrophy (FSHD)
Macht, Jordon W. "THE EFFECT OF β-HYDROXY-β-METHYLBUTYRATE (HMB) SUPPLEMENTATION ON NEUROMUSCULAR PERFORMANCE FOLLOWING FATIGUING EXERCISE IN HEALTHY SUBJECTS." UKnowledge, 2015. http://uknowledge.uky.edu/khp_etds/23.
Full textKilfoil, Monica Rosemonde. "Reliable isokinetic evaluation of strength and neuromuscular fatigue to determine the effects of pyridostigmine in subjects with post-poliomyelitis syndrome." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56980.
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