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Master Thesis

La fatigue neuromusculaire secondaire à l’ultra-trail : comparaison de deux formats de course de même distance

Abstract : Purpose: Ultra-Trail running includes 2 main types of events: single and multi-stage races. No study has yet been performed to compare fatigue and neuromuscular recovery of these 2 running formats over similar distances and elevation difference. The aim of this study was to assess neuromuscular fatigue and recovery kinetics following two Ultra-Trail of equal distance run either in a single stage or in 4 successive days. The secondary objectives were to quantify the anthropometric data by studying the variations in weight and fat mass, as well as pain sensations. Methods: Thirty-two runners participated in the study: 17 ran 160 km in a single-stage and 15 ran 40 km/day over 4 days. The two races were performed on the same course. Neuromuscular function was tested before (PRE), immediately after (POST), and 2 days (D2), 5 days (D5) and 10 days (D10) after the races. Neuromuscular function was evaluated on both knee extensors and plantar flexors, either by voluntary contractions or by evoking (respectively on the femoral nerve and the tibial nerve) using electrical nerve stimulation. Results: The main results show a loss of voluntary activation (central fatigue) on knee extension greater for subjects in the single-stage race than those in the multi-stage race directly after the race. At the recovery time, responses after simple stimulation on relaxed muscles (peripheral fatigue) took longer to recover for the subjects in the multi-stage race, for both knee extensor and plantar flexors. Conclusion: Running an Ultra-Trail in several stages over consecutive days, each separated by rest, induces more prolonged damages of neuromuscular function, while running an Ultra-Trail in single-stage on the same course is associated with greater central fatigue.
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Master Thesis
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Submitted on : Wednesday, May 13, 2020 - 4:34:24 PM
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Matthieu Maréchal, Franck Bouquet. La fatigue neuromusculaire secondaire à l’ultra-trail : comparaison de deux formats de course de même distance. Médecine humaine et pathologie. 2020. ⟨dumas-02572425⟩



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