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J Appl Physiol 95: 1032-1037, 2003. First published May 16, 2003; doi:10.1152/japplphysiol.00781.2002
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High-impact exercise strengthens bone in osteopenic ovariectomized rats with the same outcome as Sham rats

Akiko Honda,1 Naota Sogo,1 Seigo Nagasawa,1 Takuya Shimizu,2 and Yoshihisa Umemura1

1Laboratory for Exercise Physiology and Biomechanics, School of Health and Sport Sciences, and 2Health Service Center, Chukyo University, Toyota 470-0393, Japan

Submitted 26 August 2002 ; accepted in final form 6 May 2003

The effect of jump exercise on middle-aged osteopenic rats was investigated. Forty-two 9-mo-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, Sham exercised, OVX sedentary, and OVX exercised. Rats in the exercise groups jumped 10 times/day, 5 days/wk, for 8 wk, with a jumping height of 40 cm. Less than 1 min was required for the jump training. After the experiment, the right tibia and femur were dissected, and blood was obtained from each rat. OVX rats were observed to have increased body weights and decreased bone mass in their tibiae 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 OVX exercised rats increased to approximately the same extent as Sham exercised rats, despite estrogen deficiency or osteopenia. Our data suggest that jump exercise has beneficial effects on lower limb bone mass, strength, bone mineral density, and morphometry in middle-aged osteopenic rats, as well as in Sham rats.

high-impact jump exercise; ovariectomy; osteopenic rats; bone mass; bone strength


Address for reprint requests and other correspondence: A. Honda, School of Health and Sport Sciences, Chukyo Univ., 101 Tokodachi, Kaizu-cho, Toyota, Aichi 470-0393, Japan (E-mail: akiko@seiken. sass.chukyo-u.ac.jp).




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