Whole Body Vibration in Neuromuscular and Withstand Gravity Responses for Middle-Aged and Elderly People
Journal
Medicine and Science in Sports and Exercise
Journal Volume
43
Journal Issue
5
Pages
935-935
Date Issued
2011
Author(s)
Lai, Chung-Liang
Tseng, Shiuan-Yu
Tseng, Chin-Yen
Shr, Shiou-Shin
Liao, Wan-Chun
Wang, Chun-Hou
Lu, Tung-Wu
Chen, Jin-Jong
Lee, Meng-Chih
Abstract
PURPOSE: The aim of this study was to analyze the correlation with electromyography (EMG) responses of vastus lateralis muscle and human body to withstand the acceleration of gravity in different whole-body vibration frequencies for Middle-Aged and Elderly People. METHODS: 15 people (age, 56.9±3.6 years; height, 162.5±11.1 cm; weight, 68.4±5.6 kg) participated in the study. Vibration treatment was administered while standing on a vibrating platform with knees bent at 1000 (LV-1000, X-train). EMG root mean square (rms) and acceleration of gravity (G) (force plate, AMTI) on human loading was recorded for 60 seconds while standing on the vibrating plate in the following conditions: no vibration and 20Hz, 30Hz and 40Hz vibration frequencies. The position was kept for 60 seconds in each treatment condition. EMGrms was collected from the vastus lateralis muscle of the dominant leg. Acceleration of gravity (G) was record all body weight. RESULTS: Vibration frequency comparisons showed statistically significant differences between 20- and 40-Hz frequencies (17%, p<0.05) and 30Hz and 40Hz frequencies (13%, p< 0.05) in EMGrms with the exception between 20 Hz and 30 Hz vibration frequencies.Vibration frequency comparisons showed statistically significant differences between 20Hz and 40Hz frequencies (25%, p< 0.05) and 30Hz and 40Hz frequencies (20%, p <0.05) in acceleration of gravity activity with the exception between 20 Hz and 30-Hz vibration frequencies. CONCLUSIONS: The EMGrms and Gravity was found be better at 20 Hz and 30 Hz, suggesting these frequencies as eliciting the highest reflex response in vastus lateralis muscle and highest acceleration of gravity during whole-body vibrations in half-squat position.
SDGs
Type
journal article