<Originals>Bone Hypertrophy in Rats : Effects of Jump Number and Height

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NAGASAWA, S. and UMEMURA, Y., Bone Hypertrophy in Rats: Effects of Jump Number and Height. Abv. Exerc. Sports Physiol., Vol.8, No.4 pp.87-92, 2002. The purpose of this study was to examine the effect of jump number (number of jumps) and height of jump in jump-exercise on bone mass and bone strength in rats. After 1 week of stabilization, 120 rats on three different occasions were qually ivided into 3 jump-exercise proups (J) [10 jumps (19J), 40 jumps (40J) and 100 jumps (100J)/day], which were then further sub-divied into 4 groups of differnt jump heights (H) [30 cm (10J/30H: 40J/30H: 100J/30H), 40 cm (10J/40H, 40J/40H, 100J/40H) and 50 cm (10J/50H 40J/50H, 100J/50H)] with another group serving as a control for each jump number (each group n=10 rats). The rats were jump-exercised 5 days week for 4 weeks. Their right tibia were then dissected out and the ultimate bending load on a three points bending test, cross-sectional areas and fat-free dry weight were measured. The percent increases in fat-free dry weight from each control group for the 10J/30H, 40J/30H and 100J/30H groups were 2.1%, 9.0% and 5.2%; for 10J/40H, 40J/40H and 100J/40H, 8.4%, 13.8% and 11.9% and for 10J/50H, 40J/50H and 100J/50H, 11.3%, 14.0% and 12.5%, respectively. In the same way, the results of the ultimate bending load showed the same tendency as the fat-free dry weight. Irrespective of jump-height, a large number of jumps was not necessary to increase bone mass and bone strength. The present study indicates that jump-number and jump-height are independent factors for increasing bone strength and mass.
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<Originals>Bone Hypertrophy in Rats : Effects of Jump Number and Height

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