Changes of Pedaling Technique and Muscle Coordination during an Exhaustive Exercise

Dorel, Sylvan, Drouet, Jean-Marc, Couturier, Antoine, Champoux, Yvan and Hug, Francois (2009) Changes of Pedaling Technique and Muscle Coordination during an Exhaustive Exercise. Medicine and Science in Sports and Exercise, 41 6: 1277-1286. doi:10.1249/MSS.0b013e31819825f8

Author Dorel, Sylvan
Drouet, Jean-Marc
Couturier, Antoine
Champoux, Yvan
Hug, Francois
Title Changes of Pedaling Technique and Muscle Coordination during an Exhaustive Exercise
Journal name Medicine and Science in Sports and Exercise   Check publisher's open access policy
ISSN 0195-9131
Publication date 2009-06-01
Year available 2009
Sub-type Article (original research)
DOI 10.1249/MSS.0b013e31819825f8
Open Access Status Not Open Access
Volume 41
Issue 6
Start page 1277
End page 1286
Total pages 10
Place of publication Philadelphia, PA United States
Publisher Lippincott Williams and Wilkins
Language eng
Formatted abstract
PURPOSE:: Alterations of the mechanical patterns during an exhaustive pedaling exercise have been previously shown. We designed the present study to test the hypothesis that these alterations in the biomechanics of pedaling, which occur during exhaustive exercise, are linked to changes in the activity patterns of lower limb muscles.

METHODS:: Ten well-trained cyclists were tested during a limited time to exhaustion, performing 80% of maximal power tolerated. Pedal force components were measured continuously using instrumented pedals and were synchronized with surface EMG signals measured in 10 lower limb muscles.

RESULTS:: The results confirmed most of the alterations of the mechanical patterns previously described in the literature. The magnitude of the root mean squared of the EMG during the complete cycle (RMScycle) for tibialis anterior and gastrocnemius medialis decreased significantly (P < 0.05) from 85% and 75% of Tlim, respectively. A higher RMScycle was obtained for gluteus maximus (P < 0.01) and biceps femoris (P < 0.05) from 75% of Tlim. The k values that resulted from the cross-correlation technique indicated that the activities of six muscles (gastrocnemius medialis, gastrocnemius lateralis, tibialis anterior, vastus lateralis, vastus medialis, and rectus femoris) were shifted forward in the cycle at the end of the exercise.

CONCLUSIONS:: The large increases in activity for gluteus maximus and biceps femoris, which are in accordance with the increase in force production during the propulsive phase, could be considered as instinctive coordination strategies that compensate for potential fatigue and loss of force of the knee extensors (i.e., vastus lateralis and vastus medialis) by a higher moment of the hip extensors.
Keyword Effectiveness
Electromyographic Responses
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Health and Rehabilitation Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 41 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 45 times in Scopus Article | Citations
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Created: Thu, 29 Aug 2013, 02:44:19 EST by Francois Hug on behalf of School of Health & Rehabilitation Sciences