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- Ensaio Clínico NCT03049241
Neuromuscular Fatigue Aetiology Comparison Between Prepubertal Boys and Adults (LENGTH-FATIG)
Potential factors involved in neuromuscular fatigue were classified into two categories: 1) central factors involving the central nervous system and neural pathways, and 2) peripheral factors occurring within the muscle beyond the neuromuscular junction. In adults, it has been shown that peripheral factors contribute to a large part of the fatigue induced by repeated maximal contractions. However in children, central factors could account for the development of fatigue to a greater extent. Force-generating capacity and musculotendinous stiffness could be two of the discriminatory factors accounting for the differences in the neuromuscular fatigue between children and adults.
Force production capacity and musculotendinous stiffness vary as function of muscle length. Naturally, they could differ depending on the muscle groups studied. The main aim of the present protocol is to compare the effect of knee extensors and ankle plantarflexors length on the development and aetiology of neuromuscular fatigue, in children and adults. The investigators formulated the hypotheses that at short muscle length force and low musculotendinous stiffness, differences in force between children and adults would be reduced. Thus neuromuscular fatigue development and aetiology would be similar between both groups. The results of the present protocol will allow to better understanding of the aetiology of neuromuscular fatigue in children and help improving training or rehabilitation programs.
Visão geral do estudo
Status
Condições
Intervenção / Tratamento
Descrição detalhada
The study of neuromuscular fatigue in children is a recently topic in the field of sport sciences. Such knowledge could improve the efficiency and security of training and rehabilitation in healthy children and children with diseases like obesity.
The LENGTH-FATIG study will provide knowledge about the peripheral and central mechanisms of the neuromuscular fatigue in children and adults. Fatigue will test for different muscle groups (knee extensors and ankle plantar flexors) at different muscle lengths (short, optimal and long).
During high-intensity exercise, prepubertal children are more resistant to fatigue than adults. Contributions of the central and peripheral components to the development of neuromuscular fatigue are also different between both populations. The reduced children's fatigue coud be particularly related to a lower peripheral (i.e. muscular) fatigue. This might be attributed to the fact that prepubertal children rely more on oxidative than anaerobic metabolism than adults during fatiguing exercise. On the other hand, nervous factors could also explain differences in fatigue between children and adults. However, this topic is scarcely documented and still controversial. To our knowledge, no study has still compared the aetiology of central fatigue (supra-spinal vs. spinal) between children and adults. Only the voluntary activation level had been studied in children, conventionally used to assess central fatigue. But this factor doesn't differentiate spinal and supra-spinal contributions to neuromuscular fatigue development.
The LENGTH-FATIG research project is a physiological and observational study comparing two age groups (adults and children). Subjects will have to perform three randomized fatigue protocols at three muscle lengths (short, optimal and long) with the knee extensors and the ankle plantar flexors.
Data will be analyzed using LabChart 7.3 Pro software (ADInstrument, New South Wales, Australia) and Statistica 8.0 software (StatSoft, Inc.) and significance will be accepted at a two-sided alpha level of p<.05. The normality and homogeneity of the variables will be checked respectively from a Shapiro-Wilk test and a Barlett test.
If normality and homogeneity of the variables are verified, absolute values of variables (Force, EMG, NIRS, etc.) will be compared using three factors (age x muscle length x muscle group) analyses of variance (ANOVA) with repeated measures. If analyses reveal a significant effect of any factor or interaction of factors, post-hoc Newman-Keuls tests will be performed to determine differences between the different conditions.
If, on the contrary, normality and homogeneity of the variables are not verified, the effects of muscle length, muscle group and age will be evaluated using a Friedman test. If the tests show significant effects, comparisons of the different conditions will be performed using Mann-Whitney and Wilcoxon tests.
Tipo de estudo
Inscrição (Real)
Contactos e Locais
Locais de estudo
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Clermont-Ferrand, França, 63003
- CHU Clermont-Ferrand
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Critérios de participação
Critérios de elegibilidade
Idades elegíveis para estudo
Aceita Voluntários Saudáveis
Gêneros Elegíveis para o Estudo
Método de amostragem
População do estudo
Descrição
Inclusion Criteria:
- Boys aged 8 to 11 years old, Tanner stages 1 to 3
- Male aged 18 to 35 years old
- Non-smoker
- Moderate physical activity level (< 4h/week)
- Covered by a social health insurance
- Consent form signed by participants and/or legal guardians.
Exclusion Criteria:
- Competitive training
- Cardiac or pulmonary diseases
- Epileptic seizures past history
- Magnetic field contraindication (including cardiac valve, pacemaker, prosthesis material, ferro-magnetic foreign body, cochlear implant and ocular prosthesis material.
Plano de estudo
Como o estudo é projetado?
Detalhes do projeto
Coortes e Intervenções
Grupo / Coorte |
Intervenção / Tratamento |
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knee extensors
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The main aim of the present protocol is to compare the effect of knee extensors and ankle plantarflexors length on the development and aetiology of neuromuscular fatigue, in children and adults
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ankle plantar
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The main aim of the present protocol is to compare the effect of knee extensors and ankle plantarflexors length on the development and aetiology of neuromuscular fatigue, in children and adults
|
O que o estudo está medindo?
Medidas de resultados primários
Medida de resultado |
Prazo |
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Maximal torque of knee extensors
Prazo: once a week during six weeks.
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once a week during six weeks.
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ankle plantar flexors joint (in N.m) measured with a dynamometer.
Prazo: once a week during six weeks.
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once a week during six weeks.
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Medidas de resultados secundários
Medida de resultado |
Prazo |
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Doublet torque amplitude (100Hz, in N.m) evoked using magnetic nerve stimulation at rest
Prazo: once a week during six weeks.
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once a week during six weeks.
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Muscular tissue oxygenation (in μmol.L-1) measured at skin surface by Near-infrared spectroscopy.
Prazo: once a week during six weeks
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once a week during six weeks
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Compound muscle action potential amplitude (i.e. M-wave ; in mV) evoked by supramaximal magnetic nerve stimulation and measured by surface Electromyography (EMG).
Prazo: once a week during six weeks
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once a week during six weeks
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High frequency doublet (100Hz)/low frequency doublet (10Hz) ratio
Prazo: once a week during six weeks
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once a week during six weeks
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fascicule length (mm) measured by B-mode real time ultrasound scanner.
Prazo: once a week during six weeks
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once a week during six weeks
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pennation angle (degree) measured by B-mode real time ultrasound scanner.
Prazo: once a week during six weeks
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once a week during six weeks
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Voluntary activation level (in %) assessed by using the twitch interpolation technique.
Prazo: once a week during six weeks
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once a week during six weeks
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EMG signal Root mean square of EMG signal during isometric maximal voluntary contractions.
Prazo: once a week during six weeks
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once a week during six weeks
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Hoffman reflex amplitude (i.e. H-reflex ; in mV) evoked by submaximal magnetic nerve stimulation measured by surface Electromyography (EMG).
Prazo: once a week during six weeks
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once a week during six weeks
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Cerebral tissue oxygenation (in μmol.L-1) measured at skin surface by Near-infrared spectroscopy
Prazo: once a week during six weeks
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once a week during six weeks
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Colaboradores e Investigadores
Datas de registro do estudo
Datas Principais do Estudo
Início do estudo (Real)
Conclusão Primária (Real)
Conclusão do estudo (Real)
Datas de inscrição no estudo
Enviado pela primeira vez
Enviado pela primeira vez que atendeu aos critérios de CQ
Primeira postagem (Real)
Atualizações de registro de estudo
Última Atualização Postada (Real)
Última atualização enviada que atendeu aos critérios de controle de qualidade
Última verificação
Mais Informações
Termos relacionados a este estudo
Palavras-chave
Termos MeSH relevantes adicionais
Outros números de identificação do estudo
- CHU-304
- 2016-A00827-44 (Outro identificador: 2016-A00827-44)
Essas informações foram obtidas diretamente do site clinicaltrials.gov sem nenhuma alteração. Se você tiver alguma solicitação para alterar, remover ou atualizar os detalhes do seu estudo, entre em contato com register@clinicaltrials.gov. Assim que uma alteração for implementada em clinicaltrials.gov, ela também será atualizada automaticamente em nosso site .
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