Etude des différences de fatigue neuromusculaire entre enfants et adultes en fonction du groupe musculaire, de la longueur musculaire et du profil métabolique

Abstract : The 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.
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Enzo Piponnier. Etude des différences de fatigue neuromusculaire entre enfants et adultes en fonction du groupe musculaire, de la longueur musculaire et du profil métabolique. Education. Université Clermont Auvergne, 2018. Français. ⟨NNT : 2018CLFAS013⟩. ⟨tel-02296688⟩

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