Exercise before puberty may confer residual benefits in bone density in adulthood: studies in active prepubertal and retired female gymnasts

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
S BassE Seeman

Abstract

Exercise during growth may contribute to the prevention of osteoporosis by increasing peak bone mineral density (BMD). However, exercise during puberty may be associated with primary amenorrhea and low peak BMD, while exercise after puberty may be associated with secondary amenorrhea and bone loss. As growth before puberty is relatively sex hormone independent, are the prepubertal years the time during which exercise results in higher BMD? Are any benefits retained in adulthood? We measured areal BMD (g/cm2) by dual-energy X-ray absorptiometry in 45 active prepubertal female gymnasts aged 10.4 +/- 0.3 years (mean +/- SEM), 36 retired female gymnasts aged 25.0 +/- 0.9 years, and 50 controls. The results were expressed as a standardized deviation (SD) or Z score adjusted for bone age in prepubertal gymnasts and chronological age in retired gymnasts. In the cross-sectional analyses, areal BMD in the active prepubertal gymnasts was 0.7-1.9 SD higher at the weight-bearing sites than the predicted mean in controls (p < 0.01). The Z scores increased as the duration of training increased (r = 0.32-0.48, p ranging between <0.04 and <0.002). During 12 months, the increase in areal BMD (g/cm2/year) of the total body, spine, and legs in th...Continue Reading

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