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Bone mass in pre- and peri-pubertal Canadian children : subtitle effects of a high impact exercise intervention, maturity, and ethnicity MacKelvie, Kerry Jane


INTRODUCTION: Osteoporosis has, in part, been attributed to physical inactivity. The direct health care costs of osteoporosis in Canada exceed 650 million dollars annually. Targeted physical activity may be an effective and feasible primary prevention strategy to lessen the burden of this debilitating disease. AIM: The primary aim was to determine the effects of a randomized, controlled, school-based, bone-loading exercise intervention on bone mineral accrual. METHODS AND RESULTS: Subjects: Children were a mixed ethnic group of 383 initially 9-11 year old boys and girls. Ethnic comparisons at baseline: For prepubertal girls (n=56), general physical activity, calcium intake, and total body (TB) and femoral neck (FN) bone mineral content (BMC) (adjusted for body size) were significantly (p

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