| Keywords |
Whole-body vibration exercise; H-reflex; Electromyography; Soleus muscle; Neuro-muscular activity |
| Abstract |
The purpose of this study was to investigate the effects of vibration frequency during whole-body vibration exercise on the soleus H-reflex in healthy adults. Fourteen Healthy adults was participated in this study. They performed whole-body vibration exercises in 4 vibration intensity conditions (No vibration, 10Hz 4 mm, 20Hz 4 mm and 27Hz 4 mm). The soleus H-reflex of right side was measured during the whole-body vibration exercise. The amplitude of H-reflex and M-wave, H/Mmax ratio were compared with one-way repeated measures of ANOVA (p<0.05) among four different vibration frequency. There were the significant differences in the amplitude of H-reflex according to vibration frequency (F=15.802, p<0.001). H-reflex was significantly reduced at 10Hz (p<0.01), 20Hz (p<0.001) and the 27Hz (p<0.01) than at No vibration. There were the significant differences in H/Mmax ratio according to vibration frequency (F=14.910, p<0.001). H/Mmax ratio was significantly reduced at 10Hz (p<0.05), 20Hz (p<0.01) and the 27Hz (p<0.01) than at No vibration. This study suggest that it might be not effective to apply an the vibration frequency of 10Hz or more during whole-body vibration exercise for proceeding of neuro-muscular activity in healthy adults. |