Bone density at weight-bearing and nonweight-bearing sites in ballet dancers: the effects of exercise, hypogonadism, and body weight.

摘要: Exercise is recommended as a means of preventing osteoporosis. When intensive, weight-bearing exercise often associated with hypogonadism. As likely to be more beneficial at than nonweight-bearing sites, and hypogonadism detrimental trabecular cortical bone, we tested the hypothesis that result in differing regional effects: net benefits weight-bearing, predominantly deficits trabecular-rich sites. Bone density (grams per cm2), body fat, fat-free mass (kilograms) were measured using dual x-ray absorptiometry 44 ballet dancers, aged 17.0 +/- 0.2 yr (mean SEM), 18 sedentary amenorrheic girls anorexia nervosa, 23 comparable age regular menstrual cycles. density, expressed percentage above or below mean cycles, was normal elevated sites dancers [femoral neck...