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The Journal of Sports Medicine and Physical Fitness 2020 Nov 04

DOI: 10.23736/S0022-4707.20.11514-7

Copyright © 2020 EDIZIONI MINERVA MEDICA

language: English

Effects of whole-body vibration training with the same amplitude and different frequencies on the proximal femoral bone density in elderly women

Liang CHENG 1, 2, Li QIAN 2, Shuwan CHANG 2, Benxiang HE 1

1 Chengdu Sport University, Chengdu, China; 2 Sichuan Sports College, Chengdu, China


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BACKGROUND: This study investigated the Whole-body vibration training with the same amplitude and different vibration frequencies was used to compare the difference in bone mineral density (BMD) of the proximal femurs in elderly women.
METHODS: This study included three age-, height-, and weight-matched groups; the medium-frequency group (n=19) received 24 weeks of whole-body vibration training with a vibration frequency of 20 Hz; the high-frequency group (n=18) received 24 weeks of whole-body vibration training with a vibration frequency of 40 Hz; and the control group (n=19) received no intervention. Changes in the BMD of the proximal femur on the dominant side in the three groups were measured using dual-energy X-ray absorptiometry.
RESULTS: According to the between-group comparison, the BMD of the greater trochanter and Ward’s triangle in the middle-frequency group increased by 7.6% and 13.3%, respectively (P<0.05), while the BMD of the greater trochanter and Ward's triangle in the high-frequency group increased by 10.6% and 16.9%, respectively (P<0.05). There was no significant difference in BMD between the medium-frequency group and the high-frequency group at 24 weeks (P>0.05).
CONCLUSIONS: Whole-body vibration training with a frequency of 20 Hz and 40 Hz improved the BMD of the proximal femurs in elderly women to varying degrees, but had no significant effect on femoral neck BMD. Under the same amplitude conditions, an increase in vibration frequency did not cause further changes in BMD.


KEY WORDS: Whole-body vibration training; Elderly women; Bone mineral density

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