Figure 4. The effects of WBV on lower extremity muscle strength. (a) The results of maximal isometric knee extension strength tests. (b) The results of maximal isokinetic concentric knee extension strength tests. (c) The results of the maximal isokinetic eccentric knee extension strength tests. RT-WBV, resistance training with whole body vibration; RT, resistance training. *significant group-by-time interaction (p < 0.05,Welch's t-test ). ○ outlier.