(.)VO(2) and EMG activity kinetics during moderate and severe constant work rate exercise in trained cyclists.

Details

Serval ID
serval:BIB_37622
Type
Article: article from journal or magazin.
Collection
Publications
Title
(.)VO(2) and EMG activity kinetics during moderate and severe constant work rate exercise in trained cyclists.
Journal
Canadian Journal of Applied Physiology
Author(s)
Cleuziou C., Perrey S., Borrani F., Lecoq A.M., Courteix D., Germain P., Obert P.
ISSN
1066-7814 (Print)
ISSN-L
1066-7814
Publication state
Published
Issued date
2004
Peer-reviewed
Oui
Volume
29
Number
6
Pages
758-772
Language
english
Abstract
The purpose of this study was to compare O(2) uptake ((.)VO(2)) and muscle electromyography activity kinetics during moderate and severe exercise to test the hypothesis of progressive recruitment of fast-twitch fibers in the explanation of the VO(2) slow component. After an incremental test to exhaustion, 7 trained cyclists (mean +/- SD, 61.4 +/- 4.2 ml x min(-1) x kg(- 1)) performed several square-wave transitions for 6 min at moderate and severe intensities on a bicycle ergometer. The (.)VO(2) response and the electrical activity (i.e., median power frequency, MDF) of the quadriceps vastus lateralis and vastus medialis of both lower limbs were measured continuously during exercise. After 2 to 3 min of exercise onset, MDF values increased similarly during moderate and severe exercise for almost all muscles whereas a (.)VO(2) slow component occurred during severe exercise. There was no relationship between the increase of MDF values and the magnitude of the (.)VO(2) slow component during the severe exercise. These results suggest that the origin of the slow component may not be due to the progressive recruitment of fast-twitch fibers.
Keywords
Adolescent, Adult, Bicycling/physiology, Electromyography, Humans, Male, Muscle Fibers, Fast-Twitch/physiology, Muscle, Skeletal/physiology, Oxygen Consumption/physiology, Physical Endurance/physiology, Physical Exertion/physiology, Quadriceps Muscle/physiology, Task Performance and Analysis, Time Factors
Pubmed
Web of science
Create date
19/11/2007 11:12
Last modification date
03/03/2018 16:05
Usage data