بزرگترین مرجع دانلود تحقیق و مقاله

 تعدادصفحه 15

Received Aug 14, 2000; accepted Nov 20, 2000.

1. Physical activity has a beneficial effect on bone development in circumpubertal children, although its effect on younger childrenis uncertain. In this cross-sectional study, we examined associationsbetween physical activity and bone measures in 368 preschool children(mean age: 5.2 years, range: 4-6 years).

Design. Physical activity was measured using 4-day accelerometry readings, parental report of childrens usual physical activity,and parental report of childrens hours of daily television viewing.Total body and site-specific bone mineral content and area bonemineral density (BMD) were measured by dual energy radiographabsorptiometry