Neuromuscular fatigue after long-duration adventure racing in adolescent athletes
Authors/Creators
Anthony Birat
Yoann M. Garnier
Pierre Bourdier
Alexis Dupuy
Alexandre Dodu
Claire Grossoeuvre
Anne-Charlotte Dupont
Anthony J. Blazevich, Edith Cowan UniversityFollow
Mélanie Rance
Claire Morel
Stéphane Nottin
Sébastien Ratel
Abstract
Purpose: To characterize the acute effects of a long-duration adventure race on knee extensor (KE) fatigue and the knee functional ratio in adolescent athletes. Methods: Twenty trained male adolescents (aged 14-17 y) performed an adventure race of 68.5 km. Maximal voluntary isometric contraction (MVIC) KE and knee flexor torques were measured before and immediately after the race. Central and peripheral components of neuromuscular fatigue were quantified from the maximal voluntary activation level and the doublet peak torque (Tw100), respectively. The peak eccentric knee flexor torque to concentric KE torque ratio was also measured to determine functional ratio. Results: The race completion time was 05:38 (00:20) hours. Significant reductions in MVICKE (-14.7%, P < .001) and MVICKF (-17.0%, P < .01) were observed after the race. Voluntary activation level decreased by 8.3% (P < .001) while Tw100 remained unchanged. Peak eccentric knee flexor torque decreased 16.0% (P < .001) while peak concentric KE torque did not change. This resulted in a significant reduction in functional ratio (-12.0%, P < .01). Conclusion: The adventure race induced a moderate fatigue, which was mainly explained by central factors without significant peripheral fatigue. However, particular attention should be paid to the knee muscular imbalance incurred by the race, which could increase the risk of ligament injury in adolescent athletes.
Document Type
Journal Article
Date of Publication
2021
Volume
33
Issue
3
Publication Title
Pediatric Exercise Science
Publisher
Human Kinetics
School
School of Medical and Health Sciences / Centre for Exercise and Sports Science Research
RAS ID
36572
Copyright
subscription content
First Page
103
Last Page
111
Comments
Birat, A., Garnier, Y. M., Bourdier, P., Dupuy, A., Dodu, A., Grossoeuvre, C., . . . Ratel, S. (2021). Neuromuscular fatigue after long-duration adventure racing in adolescent athletes. Pediatric Exercise Science, 33(3), 103-111. https://doi.org/10.1123/pes.2020-0201