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Recovery from Fatigue following Cycling Time-Trials in Elite Endurance Athletes

Abstract : Introduction: We determined the recovery from neuromuscular fatigue in six professional (PRO) and seven moderately trained cyclists (MOD) following repeated cycling time-trials of various intensity/duration. Method: Participants performed two 1-min (1minTT) or two 10-min (10minTT) self-paced cycling time-trials with 5-min of recovery in-between. Central and peripheral fatigue were quantified via pre- to post-exercise (15-s through 15-min recovery) changes in voluntary activation (VA) and potentiated twitch force. VA was measured using the interpolated twitch technique and potentiated twitch force was evoked by single (QTsingle) and paired [10-Hz (QT10) and 100-Hz (QT100)] electrical stimulations of the femoral nerve. Results: Mean power output was 32-72% higher during all the time-trials and decreased less (-10% vs -13%) from the first to second time-trial in PRO compared with MOD (P<0.05). Conversely, exercise-induced reduction in QTsingle and QT10/QT100 was significantly lower in PRO following every time-trial (P<0.05). Recovery from fatigue from 15-s to 2-min for QTsingle and QT10/QT100 was slower in PRO following every time-trial (P<0.05). In both groups, the reduction in QTsingle was lower following the 10minTTs compared with 1minTTs (P<0.05). Conversely, VA decreased more after the 10minTTs compared with 1minTTs (P<0.05). Conclusion: Our findings showed that excitation-contraction coupling was preserved following exercise in PRO compared with MOD. This likely contributed to the improved performance during repeated cycling time-trials of various intensity/duration in PRO, despite a slower rate of recovery in its early phase. Finally, the time-course of recovery from neuromuscular fatigue in PRO was dependent on the effects of prolonged low-frequency force depression.
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https://hal.archives-ouvertes.fr/hal-02994788
Contributor : Guillaume Ducrocq Connect in order to contact the contributor
Submitted on : Wednesday, December 2, 2020 - 7:43:43 PM
Last modification on : Monday, October 18, 2021 - 3:26:10 PM
Long-term archiving on: : Wednesday, March 3, 2021 - 8:16:17 PM

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Guillaume Ducrocq, Thomas Hureau, Tina Bøgseth, Olivier Meste, Gregory Blain. Recovery from Fatigue following Cycling Time-Trials in Elite Endurance Athletes. Medicine and Science in Sports and Exercise, American College of Sports Medicine (ACSM), 2020, ⟨10.1249/MSS.0000000000002557⟩. ⟨hal-02994788⟩

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