Sunday, January 11, 2009

Best exercises for strong bones (5 of 5)

Swimming

Many studies found that swimmers had lower bone densities than athletes in weight-bearing sports and lower or similar bone densities as non-athletes. The results apply to males and females—prepuberty age, adolescents and adults. Swimming is not reputed to increase bone mineral density.

But most studies used dual X-ray absorptiometry (DXA), a two-dimensional measure highly influenced by body size.

Male water polo players and weightlifters assessed using quantitative computed tomography (QCT) had similar bone densities.

Rat studies found that swimming improved bone elasticity and structural strength—properties that could only be seen with quantitative ultrasound (QUS).Perhaps when more human studies use QUS, swimming will shake off its bad reputation. In the meantime, swimmers should cross-train with weights or impact exercise.

Sources: National Osteoporosis Foundation, American College of Sports Medicine, American Council on Exercise, Harvard School of Public Health

Note: The Scientific Sports & Fitness Council will hold a Functional Training seminar March 24. Topics will include core functional anatomy and core exercises. Call 6348545 local 101. - dailiyinquirer

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