The influence of height, body mass, daily physical activity (DPA), and dietary calcium intake (DCI) on bone mineral density (BMD) and content (BMC) was evaluated in 33 four-year-old girls. Results indicated that body mass was significantly correlated with and predictive of BMD and BMC at all sites except the femoral neck BMD. DPA and height also explained a significant proportion of the variance in femoral neck BMD and BMC of the lumbar spine and total body. DCI was not related to or predictive of BMD or BMC at any bone site. These findings highlight the importance of engaging in daily weight-bearing physical activity to promote bone health in young girls.
Ondrak is with The University of North Carolina, 25 Fetzer Gym, CB#8700, Chapel Hill, NC 27599-8700; Morgan is with Middle Tennessee State University, Department of Health and Human Performance, Box 96, AMG 154, Murfreesboro, TN 37132.