Document Detail


Spring-mass behavior and electromyographic activity evolution during a cycle-run test to exhaustion in triathletes.
MedLine Citation:
PMID:  22613822     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: To evaluate spring-mass (SM) behavior and associated electromyographic (EMG) activity during a run to exhaustion following a cycle exercise in trained triathletes. METHODS: Ten triathletes completed four tests: a cycling test to determine V˙O(2max); a running test to determine the lactate threshold (LT); a 5min control run at LT (C-Run) followed after a total recovery period by a cycle-to-run session to exhaustion [30min of cycling at ∼80% V˙O(2max) followed by a run until exhaustion at LT (T-Run)]. SM behavior and EMG signals in nine lower limb muscles were recorded throughout the running sessions. RESULTS: Immediately after cycling, leg stiffness was 12.1% higher than its C-Run value and a concomitant increase of EMG activity of knee extensors was observed during pre-contact. Throughout T-Run, leg stiffness decreased by 7.3%, while knee extensors and ankle flexors activities decreased during pre-contact and braking phases. No significant variations in SM parameters and no significant increase of muscle activity were reported between C-Run and the end of T-Run. CONCLUSION: SM behavior during the cycle-run test was consistent with EMG activity changes. Cessation of exercise was not associated with significant alterations of stiffness values and EMG activity.
Authors:
Y Le Meur; S Dorel; G Rabita; T Bernard; J Brisswalter; C Hausswirth
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-5-19
Journal Detail:
Title:  Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology     Volume:  -     ISSN:  1873-5711     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-5-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9109125     Medline TA:  J Electromyogr Kinesiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Affiliation:
Research Department, National Institute of Sport, Expertise and Performance, 75012 Paris, France; Laboratory of Physiological Adaptations, Motor Performance and Health (EA 3837), University of Nice-Sophia Antipolis, Faculty of Sport Sciences, BP 32 59, 06205 Nice Cedex 03, France.
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