Abstract:
The purpose of this research was to study and compare the acute effect of Whole-body vibration when using different positions and durations on muscular power. Twelve female athletes and softball players 18-22 years old, from Chulalongkorn University performed 6 Whole-body vibration treatments in a counter-balance order. Treatment 1-3: Performing static half squat, Treatment 1 the vibrations duration was 15 seconds, Treatment 2: the vibrations duration was 30 seconds, Treatment 3: the vibrations duration was 45 seconds, Treatment 4-6: Performing static quarter squat, Treatment 4 the vibrations duration was 15 seconds, Treatment 5: the vibrations duration was 30 seconds, Treatment 6: the vibrations duration was 45 seconds, and all treatments performed for six weeks. The frequency of vibrations was set at 45 Hz with, the amplitude at 4 mm. The muscular power was assessed during pretest and posttest vibration treatment. The data were analyzed using Two-Way ANOVA folowed by LSD method and compare between before and after each vibration treatment with Paired-Sample t-test The result showed that the muscular power were unaffected either by body positions or vibration durations. Nevertheless, there was a trend for an increase in muscular power during static quarter squat when vibration duration was increased.