The Efficacy of the Whole Body Vibration (WBV) Training on Electromyography Indexes of Knee Extensor Muscles in Non-Athletic Girls

Backgrounds and The Whole Body Vibration (WBV) training has been considered as a training tool for the athletes، non-athletes، elderly individuals. The aim of this study was to determine the effect of WBV training on electromyography indexes of knee extensor muscles in non-athletic girls. Twelve non-athletic student girls randomized into experimental (n=10) and control (n=10) groups. Amplitude and frequency of electrical waves related to right feet knee extensor muscles was measured in a Maximal Voluntary Isometric Contraction (MVC)، one day before and after WBV training. The vibration group was treated for 4 weeks (3 times/ week) with 30 HZ frequency، 2. 5 mm amplitude and in 5 situations of squat (knee 900، 1200، 1800، right feet and left feet). The time of each training set was 30 seconds followed by a 20 seconds as rest time between each set. There was no significant differences in amplitude and frequency of electrical waves of rectus femoris، vastus lateralis، vastus medialis muscles between both groups in pre- and post-tests (p>0. 05). The significant differences was found in amplitude and frequency of electrical waves of rectus femoris، vastus lateralis، vastus medialis muscles in experimental group in pre- and post-tests (p<0. 05). WBV training may affect the electromyography indexes of knee extensor muscles in non-athletic girls.