Neuromuscular Fatigue After Long-Duration Adventure Racing in Adolescent Athletes

Author:

Birat Anthony12,Garnier Yoann M.1,Bourdier Pierre13,Dupuy Alexis1,Dodu Alexandre2,Grossoeuvre Claire2,Dupont Anne-Charlotte24,Blazevich Anthony J.5,Rance Mélanie6,Morel Claire6,Nottin Stéphane7,Ratel Sébastien1

Affiliation:

1. 1Université Clermont Auvergne

2. 2Fédération Française Triathlon

3. 3Université de Strasbourg

4. 4Université de Lorraine

5. 5Edith Cowan University

6. 6Centre de Ressources et d’Expertise de la Performance Sportive (CREPS)

7. 7Université Avignon

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.

Publisher

Human Kinetics

Subject

Physical Therapy, Sports Therapy and Rehabilitation,Orthopedics and Sports Medicine,Pediatrics, Perinatology and Child Health

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