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1 Laboratory for Exercise Physiology and Biomechanics, School of Health and Sport Sciences, Chukyo University, Toyota, Japan
2 Health Service Center, Chukyo University, Toyota, Japan
* To whom correspondence should be addressed. E-mail: akiko{at}seiken.sass.chukyo-u.ac.jp.
The effect of jump exercise on middle-aged osteopenic rats was investigated. Forty-two 9 month-old female rats were either Sham-operated (Sham) or ovariectomized (OVX). Three months after surgery, the rats were divided into the following groups: Sham-Sedentary (SS), Sham-Exercised (SE), OVX-Sedentary (OS), and OVX-Exercised (OE). Rats in the exercise groups were jumped 10 times/day, 5 days/week, for 8 weeks, with a jumping-height of 40 cm. Less than a minute was required to jump-training. After the experiment, the right tibia and femur were dissected and blood was obtained from each rat. Ovariectomized rats were observed to have increased body weights and decreased bone mass in their tibias and femurs. Jump-exercised rats, on the other hand, had significantly increased tibial bone mass, strength, and cortical areas. The bone mass and strength of OE rats increased to approximately the same extent as SE rats, despite estrogen-deficiency or osteopenia. Our data suggest that jump exercise has beneficial effects on lower limb bone mass, strength, BMD, and morphometry in middle-aged osteopenic rats, as well as sham rats.
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