Motor adaptations to unilateral quadriceps fatigue during a bilateral pedaling task

Brøchner Nielsen, N. P., Hug, F., Guével, A., Fohanno, V., Lardy, J. and Dorel, S. (2016) Motor adaptations to unilateral quadriceps fatigue during a bilateral pedaling task. Scandinavian Journal of Medicine and Science in Sports, 27 12: 1724-1738. doi:10.1111/sms.12811

Author Brøchner Nielsen, N. P.
Hug, F.
Guével, A.
Fohanno, V.
Lardy, J.
Dorel, S.
Title Motor adaptations to unilateral quadriceps fatigue during a bilateral pedaling task
Journal name Scandinavian Journal of Medicine and Science in Sports   Check publisher's open access policy
ISSN 1600-0838
Publication date 2016-12-20
Year available 2016
Sub-type Article (original research)
DOI 10.1111/sms.12811
Open Access Status Not yet assessed
Volume 27
Issue 12
Start page 1724
End page 1738
Total pages 15
Place of publication Chichester, West Sussex United Kingdom
Publisher Wiley-Blackwell Publishing
Language eng
Subject 2732 Orthopedics and Sports Medicine
3612 Physical Therapy, Sports Therapy and Rehabilitation
Abstract This study was designed to investigate how motor coordination adapts to unilateral fatigue of the quadriceps during a constant-load bilateral pedaling task. We first hypothesized that this local fatigue would not be compensated within the fatigued muscles leading to a decreased knee extension power. Then, we aimed to determine whether this decrease would be compensated by between-joints compensations within the ipsilateral leg and/or an increased contribution of the contralateral leg. Fifteen healthy volunteers were tested during pedaling at 350 W before and after a fatigue protocol consisting of 15 minutes of electromyostimulation on the quadriceps muscle. Motor coordination was assessed from myoelectrical activity (22 muscles) and joint powers calculated through inverse dynamics. Maximal knee extension torque decreased by 28.3%±6.8% (P<.0005) immediately after electromyostimulation. A decreased knee extension power produced by the ipsilateral leg was observed during pedaling (−22.8±12.3 W, −17.0%±9.4%; P<.0005). To maintain the task goal, participants primarily increased the power produced by the non-fatigued contralateral leg during the flexion phase. This was achieved by an increase in hip flexion power confirmed by a higher activation of the tensor fascia latae. These results suggest no adjustment of neural drive to the fatigued muscles and demonstrate no concurrent ipsilateral compensation by the non-fatigued muscles involved in the extension pedaling phase. Although interindividual variability was observed, findings provide evidence that participants predominantly adapted by compensating with the contralateral leg during its flexion phase. Both neural (between legs) and mechanical (between pedals) couplings and the minimization of cost functions might explain these results.
Keyword compensation strategy
interlimb coupling
joint-specific power
multijoint task
muscle coordination
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 14-R-23
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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Created: Sat, 16 Dec 2017, 19:42:51 EST