Relationship between neuromuscular fatigue, muscle activation and the work done above the critical power during severe intensity exercise
Résumé
Ducrocq GP and Blain GM. Relationship between neuromuscular fatigue, muscle activation and the work done above the critical power during severe intensity exercise. What is the central question of this study? Does the work done above critical power (W') or muscle activation determine the degree of peripheral fatigue induced by cycling time-trials performed in the severe intensity domain? What is the main finding and its importance? We found that peripheral fatigue increased when power output and muscle activation increased whereas W' did not change between the time-trials. Therefore, no relationship was found between W' and exercise-induced peripheral fatigue such as previously postulated in the literature. In contrast, we found a significant association between EMG amplitude during exercise and exercise-induced reduction in the potentiated quadriceps twitch, suggesting that muscle activation plays a key role in determining peripheral fatigue during severe intensity exercise.
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