Spring-mass behavior and electromyographic activity evolution during a cycle-run test to exhaustion in triathletes

Yann Le Meur 1 Giuseppe Rabita 1 S. Dorel 1, 2 T. Bernard 3 J. Brisswalter 4 Christophe Hausswirth 5
1 SEP (EA7370) - French Institute of Sport (INSEP), Research Department, Laboratory Sport, Expertise and Performance (EA7370)
2 MIP - Motricité, interaction, performance
3 HANDIBIO - Laboratoire de Biomodélisation et Ingénierie des Handicaps - EA 4322
4 UNS UFR Sciences - Université Nice Sophia Antipolis - Faculté des Sciences
5 INSEP - Institut national du sport, de l'expertise et de la performance
Abstract : 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 5 min control run at LT (C-Run) followed after a total recovery period by a cycle-to-run session to exhaustion [30 min 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.
Keywords : Muscle Lactic Acid Lower Extremity Adult Athletes Bicycling Electromyography Exercise Test Heart Rate Humans Skeletal Oxygen Consumption Physical Exertion Running
Type de document :
Article dans une revue
J Electromyogr Kinesiol, 2012, 22 (6), pp.835--844. 〈10.1016/j.jelekin.2012.04.011〉
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Contributeur : Cécile Ferran <>
Soumis le : mardi 5 juillet 2016 - 11:51:10
Dernière modification le : mercredi 27 juin 2018 - 01:20:34

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Yann Le Meur, Giuseppe Rabita, S. Dorel, T. Bernard, J. Brisswalter, et al.. Spring-mass behavior and electromyographic activity evolution during a cycle-run test to exhaustion in triathletes. J Electromyogr Kinesiol, 2012, 22 (6), pp.835--844. 〈10.1016/j.jelekin.2012.04.011〉. 〈hal-01342025〉

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