european college of sport science

Friday, June 26th, 2009
TIME TO EXHAUSTION DURING SUBMAXIMAL ISOMETRIC FATIGUING EXERCISE IS INCREASED AFTER WHOLE BODY
VIBRATION TRAINING
COLSON, S.S., HÉBRÉARD, L., PETIT, P.D., TESSARO, J., PENSINI, M.
UNIVERSITY OF NICE-SOPHIA ANTIPOLIS
Introduction: The acute effects of exhaustive whole body vibration (WBV) exercise have been examined (Rittweger et al., 2000; 2003),
However, only one study reports that WBV training prevents increases in fatigability during bedrest (Mulder et al., 2007). Therefore, the
aim of this study was to examined the effect of 6 weeks of WBV training on knee extensor muscles endurance time during a submaximal
isometric fatiguing contraction and mechanisms (i.e., central and/or peripheral) contributing to task failure.
Methods: 11 active males performed a fatiguing isometric contraction with the knee extensor muscles at 50% of maximal voluntary contraction
(MVC) until exhaustion before (PRE) and after (POST) 6 weeks of WBV training. At PRE and POST, the electromyographic (EMG)
activity and muscle activation obtained under MVC were recorded before and after the fatiguing task to assess central fatigue. Torque
and EMG responses obtained under electrically evoked contractions were examined to analyze the peripheral fatigue.
Results: Knee extensor MVC torque did not increase significantly between PRE and POST (+9.4%, P>0.05), which meant that the average
target torque sustained during the fatiguing contraction did not increased either between the testing sessions. Endurance time increased
significantly in between PRE and POST (+29.6%; P