Abstract:
The purpose of this study was to investigate the acute effect of Wholebody vibration on leg muscular power during static and dynamic contractions. Sixteen female undergraduate students, 18-22 years old, relative strength 1.5-2.0 from Faculty of Sport Science, Chulalongkorn University performed four Wholebody vibration treatment in a counter-balance order. Treatment 1: Performing static half squat during 45 sec of vibration session, the frequency was 40 Hz, the amplitude was 2-4 mm, Treatment 2: Performing static half squat during 45 sec of vibration session, the frequency was 50 Hz ,the amplitude was 4-6 mm, Treatment 3: Performing dynamic half squat during 45 sec of vibration session, the frequency was 40 Hz, the amplitude was 2-4 mm and Treatment 4: Performing dynamic half squat during 45 sec of vibration session, the frequency was 50 Hz ,the amplitude was 4-6 mm within four weeks. The data of leg muscular power were assessed pre and post vibration. The obtained of data were analyzed in term of One-Way analysis of Variance with repeated measure between 4 vibration treatment (multiple comparison by LSD) and compare between before and after vibration with Paired-Sample t-test to also employed for statistical significant (p<0.05) The research result indicated that the acute effect of treatment 1 significantly increase peak power comparing to before and after vibration data at the 0.05 level. Moreover, the acute effect of treatment 3 significantly increase in peak vertical ground reaction force and the acute effect of treatment 1 and 4 significantly increase in peak bar velocity. However, there were no significant differences between four Whole-body vibration treatment.