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Articles in PresS, published online ahead of print July 5, 2002
J Appl Physiol, 10.1152/jap.00358.2002
Submitted on April 23, 2002
Accepted on June 27, 2002
1 School of Health and Sport Sciences, Chukyo University, Toyota, Aichi, Japan
* To whom correspondence should be addressed. E-mail: yumemura{at}sass.chukyo-u.ac.jp.
It was reported that prolonged loading repetitions diminished the mechanosensitivity of bones, and that loading interval might restore sensitivity. This study was designed to investigate the effects of intervals between loadings or bouts on osteogenic response. Forty female Fisher 344 rats aged 5 weeks were divided into a control group and three exercise groups; 20 jumps in a single bout with a 3-second (S3) or 30-second (S30) jump interval, or 20 jumps in two bouts (10 x 2) separated by a 6 hr interval with a 3-second jump interval (D3). After 8 weeks of training, the bone masses per body weight of the femur and tibia were significantly greater in the three exercise groups than in the control group, and were also greater in S30 than in S3, although these were at the same level in D3 and S3. These data suggest that a longer interval (30s) between individual loading had more effective anabolic effects on bone than a shorter interval (3s).
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