Journal of Applied Physiology AJP: Endocrinology and Metabolism
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J Appl Physiol 93: 1345-1348, 2002. First published July 5, 2002; doi:10.1152/japplphysiol.00358.2002
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Vol. 93, Issue 4, 1345-1348, October 2002

Effects of intervals between jumps or bouts on osteogenic response to loading

Yoshihisa Umemura, Naota Sogo, and Akiko Honda

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

Prolonged loading repetitions can diminish the mechanosensitivity of bones, and increased intervals between loading 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 wk were divided into a control group and three exercise groups: 20 jumps in a single bout with a 3-s (S3) or 30-s (S30) jump interval, or 20 jumps in 2 bouts (10 × 2) separated by a 6-h interval with a 3-s jump interval (D3). After 8 wk 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 these values were also greater in S30 than in S3, although they were at the same level in D3 and S3. These data suggest that a longer interval (30 s) between individual loading had more effective anabolic effects on bone than a shorter interval (3 s).

high-impact exercise; mechanical stress; maximum breaking force


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