Journal of Applied Physiology
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J Appl Physiol 91: 1663-1668, 2001;
8750-7587/01 $5.00
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Vol. 91, Issue 4, 1663-1668, October 2001

Swim-trained rats have greater bone mass, density, strength, and dynamics

K. J. Hart1, J. M. Shaw1, E. Vajda2, M. Hegsted3,4, and S. C. Miller1,2,3

1 Department of Exercise and Sport Science, 2 Division of Radiobiology, and 3 Department of Nutrition, University of Utah, Salt Lake City, Utah 84112; and 4 School of Human Ecology, Louisiana State University, Baton Rouge, Louisiana 70803

Weight-bearing exercise is traditionally recommended for improving bone health in postmenopausal women. Effects of swim exercise were studied as an alternative to weight-bearing exercise in ovariectomized rats. Rats in a swim group (Sw, n = 8) swam for 12 wk, 5 days/wk for 60 min per session. A control group (Con, n = 9) engaged in no structured exercise. Femurs were analyzed for bone mineral density and for bone mineral content by dual energy X-ray absorptiometry, biomechanical properties by three-point bending (Instron), and bone structure and formation by histomorphometry. Food intake did not differ among groups. Final body weights were significantly lower in Sw compared with Con (P < 0.05). Swimmers had significantly greater femoral shaft bone mineral density and content (P < 0.05) compared with Con. Femurs of the Sw group had greater mechanical properties (P < 0.05) compared with Con. Histomorphometric data were significantly better in the Sw group compared with Con after the 12-wk intervention (P < 0.05). In conclusion, data from this study demonstrate some beneficial effects of swim exercise on bone structure, turnover, and strength.

swimming; bone; rats; aging; ovariectomy


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