Unipedal standing exercise and hip bone mineral density in postmenopausal women: a randomized controlled trial |
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Authors: | Akinori Sakai Toshihisa Oshige Yukichi Zenke Yoshiaki Yamanaka Hitoshi Nagaishi Toshitaka Nakamura |
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Institution: | (1) Department of Orthopaedic Surgery, School of Medicine, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu 807-8555, Japan;(2) Department of Radiology, Arita-Kyouritsu Hospital, 2485-3 Tachibe, Arita Saga, 849-4193, Japan |
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Abstract: | The aim of this study was to test the effect of unipedal standing exercise on bone mineral density (BMD) of the hip in postmenopausal
women. Japanese postmenopausal women (n = 94) were assigned at random to an exercise or control group (no exercise). The 6-month exercise program consisted of standing
on a single foot for 1 min per leg 3 times per day. BMD of the hip was measured by dual-energy X-ray absorptiometry. There
was no significant difference in age and baseline hip BMD between the exercise group (n = 49) and control group (n = 45). Exercise did not improve hip BMD compared with the control group. Stepwise regression analysis identified old age
as a significant determinant (p = 0.034) of increased hip total BMD at 6 months after exercise. In 31 participants aged ≥70 years, the exercise group (n = 20) showed significant increase in the values of hip BMD at the areas of total (p = 0.008), intertrochanteric (p = 0.023), and Ward’s triangle (p = 0.032). The same parameters were decreased in the control group (n = 11). The percent changes in hip BMD of the exercise group were not significantly different from those of the control group
either in the participants with low baseline hip total BMD (<80% of the young adult mean) or high baseline hip total BMD (≥80%
of the young adult mean). In conclusion, unipedal standing exercise for 6 months did not improve hip BMD in Japanese postmenopausal
women. Effect of exercise on hip total BMD was age dependent. In participants aged ≥70 years, the exercise significantly increased
hip total BMD. |
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