Adjustment of muscle coordination during an All-Out sprint cycling task

Dorel, Sylvain, Guilhem, Gael, Couturier, Antoine and Hug, Francois (2012) Adjustment of muscle coordination during an All-Out sprint cycling task. Medicine and Science in Sports and Exercise, 44 11: 2154-2164. doi:10.1249/MSS.0b013e3182625423

Author Dorel, Sylvain
Guilhem, Gael
Couturier, Antoine
Hug, Francois
Title Adjustment of muscle coordination during an All-Out sprint cycling task
Journal name Medicine and Science in Sports and Exercise   Check publisher's open access policy
ISSN 0195-9131
Publication date 2012-11
Year available 2012
Sub-type Article (original research)
DOI 10.1249/MSS.0b013e3182625423
Volume 44
Issue 11
Start page 2154
End page 2164
Total pages 11
Place of publication Philadelphia, PA United States
Publisher Lippincott Williams and Wilkins
Collection year 2013
Language eng
Formatted abstract
PURPOSE: This study was designed to assess muscle coordination during a specific all-out sprint cycling task (Sprint). The aim was to estimate the EMG activity level of each muscle group by referring to the submaximal cycling condition (Sub150 W) and to test the hypothesis that a maximal activity is reached for all of the muscles during Sprint.

Fifteen well-trained cyclists were tested during submaximal and sprint cycling exercises and a series of maximal voluntary contractions (MVCs) in isometric and isokinetic modes (MVC at the three lower limb joints). Crank torque and surface EMG signals for 11 lower limb muscles were continuously measured.

Results: Results showed that Sprint induced a very large increase of EMG activity level for the hip flexors (multiplied by 7-9 from 150 W to Sprint) and the knee flexors and hip extensors (multiplied by 5-7), whereas plantar flexors and knee extensors demonstrated a lower increase (multiplied by 2-3). During Sprint, EMG activity level failed to reach a maximal value for hamstrings, tibialis anterior, tensor fasciae latae, and gluteus maximus (i.e., <70% to 80% of peak EMG activity during MVC, P < 0.05 to P < 0.001), and individual EMG patterns demonstrated a significant earlier onset and/or later offset for the majority of the muscles (P < 0.01 to P < 0.001).

ConclusionS: Results clearly suggest a change in the relative contribution of the different muscles to the power production between Sub150 W and Sprint, and provide evidence that EMG activity level is not systematically maximal for all muscles involved in the all-out sprint cycling task. The longer period of activity induced during Sprint is likely to represent an interesting coordination strategy to enhance the work generated by all of the muscle groups.
Keyword Maximal Power Output
Multijoint Task
Maximal Voluntary Contraction
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Health and Rehabilitation Sciences Publications
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Created: Wed, 28 Aug 2013, 16:05:47 EST by Francois Hug on behalf of School of Health & Rehabilitation Sciences