Fig. 4.

Root mean square value of electromyogram (RMS-EMG) during parallel squat before the intervention (mean of the lengthening and shortening phases) relative to those recorded at maximal voluntary isometric contraction (MVC). Number sign indicates a significant difference between muscles. VL vastus lateralis, VM vastus medialis, RF rectus femoris, BF biceps femoris long head, SM semimembranosus. VL condition, tonic vibration to the vastus lateralis during quiet sitting for 30 min; BF condition, tonic vibration to the biceps femoris long head during quiet sitting for 30 min; CON condition, quiet sitting for 30 min without muscle vibration. Data are presented as mean ± standard deviation