This study was a randomized control trial. The purpose of this study was twofold: (1) to determine if stretching the hamstrings during whole-body-vibration (WBV) is more effective than static stretching alone; and (2) to monitor retention of flexibility changes. The main outcome measure was hamstring flexibility as measured in degrees using a passive knee extension test. Thirty-four recreationally active college-age subjects (23.4 +/- 1.7 yrs) completed this study (22 males, 12 females, average height 175.6 +/- 6.4 cm, average weight 74.9 +/- 11.8 kg). Subjects were assigned to a control group (C), a static stretch group (SS), or a vibration plus static stretch group (V). Subjects stretched 5 days/wk for 4-weeks and were followed for 3-weeks after cessation to monitor retention. Analysis showed a significant difference between treatment groups (p < 0.0001), time (p < 0.0001), gender (p = 0.0002) and in treatment x time (p = 0.0119), with 14% +/- 3.86% (SEM) and 22% +/- 3.86% (SEM) increases in flexibility after 4-weeks of stretching for the SS and V groups respectively. Three-week follow-up showed SS returning to baseline with V group still 6.4 degrees (11% +/- 3.88% (SEM)) more flexible than at baseline. Stretching concurrently with vibration on a WBV platform appears to be a good adjunct to static stretching with the potential to enhance retention of flexibility gains.

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