Affiliations: Department of Physical Education, Sun Yat-Sen University, Guangzhou, Guangdong, China
Correspondence:
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Corresponding author: Yilin Yang, Department of Physical Education, Sun Yat-Sen University, No. 135, Xingang Xi Road, Guangzhou, Guangdong 510275, China. E-mail: isbs2015@163.com.
Abstract: BACKGROUND: The effects of whole-body vibration training (WBVT) with same frequency and different amplitudes on bone mineral density (BMD) in the elderly is not reported. OBJECTIVE: To compare the effect of 45-Hz WBVT with different amplitudes on the BMD in elderly women. METHODS: Age-, height-, and weight-matched patients were assigned to a low-amplitude group (n= 19, amplitude of 2 mm), medium-amplitude group (n= 18, amplitude of 3 mm), high-amplitude group (n= 19, amplitude 4 mm), and control group (n= 20). The WBVT was conducted for 24 weeks in the three amplitude groups. The BMD at lumbar vertebrae L2-4 and the proximal femur was measured at 0 and 24 weeks. RESULTS: The BMD at lumbar vertebrae L2-4 was higher in the high-amplitude group than in the low-amplitude and middle-amplitude groups, and the BMD of the greater trochanter was significantly higher than that in the low-amplitude group (p< 0.05). The BMD of the greater trochanter was significantly higher in the middle- than low-amplitude group (p< 0.05). CONCLUSION: A higher amplitude should be considered when WBVT is performed in elderly patients to increase bone density and prevent osteoporosis.
Keywords: Whole-body vibration training, amplitude, frequency, elderly women, bone mineral density
