Increased Fatigue Response to Augmented Deceptive Feedback during Cycling Time Trial
Résumé
This study aimed to investigate the effect of different magnitudes of deception on performance and exercise-induced fatigue during cycling time-trial. Methods: Following three familiarization visits, three females and eight males performed three 5 km cycling time-trials while following a simulated dynamic avatar reproducing either 100% (5K100%), 102% (5K102%) or 105% (5K105%) of the subject's previous fastest trial. Quadriceps muscle activation was quantified with surface electromyography. Fatigue was quantified by pre-to post-exercise (10 s through 15 min recovery) changes in quadriceps maximal voluntary contraction (MVC) force, potentiated twitch force evoked by electrical femoral nerve stimulation (QTSingle) and voluntary activation (VA, twitch interpolation technique). Results: Greater quadriceps muscle activation in 5K102% vs. 5K100% (12±11%) was found in parallel with a 5±2% and 2±1% improvement in power output and completion time, respectively (p < 0.01). Exercise-induced reduction in MVC force and VA were 14±19% and 28±31% greater at exercise termination (at 10 s) whereas QTSingle recovery (from 10 s to 15 min) was 5±5% less in 5K102% vs. 5K100% (p < 0.01). No difference in performance or fatigue indices measured at exercise termination was found between 5K100% and 5K105%. Conclusion: Muscle activation and performance improvements during a deceptive cycling time-trial were achieved only with a 2% magnitude of deception and were associated with a further impairment in MVC force, QTSingle recovery and VA compared to control. Performance improvement during cycling time-trial with augmented deceptive feedback therefore resulted in exacerbated exerciseinduced peripheral and central fatigue.
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Ducrocq - 2017 - Increased Fatigue Response to Augmented Deceptive Feedback during Cycling Time Trial.pdf (3.66 Mo)
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