TY - JOUR
T1 - Physical activity augments bone mineral accrual in young children
T2 - The Iowa Bone Development Study
AU - Janz, Kathleen F.
AU - Gilmore, Julie M.
AU - Burns, Trudy L.
AU - Levy, Steven M.
AU - Torner, James C.
AU - Willing, Marcia C.
AU - Marshall, Teresa A.
N1 - Funding Information:
Supported by grants from the National Institutes of Health RO1-DE12101, R01-DE09551 and MO1-RR00059.
PY - 2006/6
Y1 - 2006/6
N2 - Objectives: This 3-year follow-up study examined associations between physical activity and bone mineral content (BMC) and whether physical activity augments BMC accrual. Study design: Participants were 370 children (mean age baseline 5.3 years, follow-up 8.6 years). Physical activity was measured using 4-day accelerometry. BMC was measured using dual energy x-ray absorptiometry. Results: After adjustment for baseline BMC, age, and body size, mean physical activity predicted follow-up BMC at the hip, trochanter, spine, and whole body in boys and at the trochanter and whole body in girls. The variability in BMC explained by physical activity was modest (1% to 2%). However, based on a general linear model with adjustment for baseline BMC and body size, children who maintained high levels of physical activity accrued, on average, 14% more trochanteric BMC and 5% more whole-body BMC relative to peers maintaining low levels of physical activity. Conclusions: This study suggests that maintaining high levels of everyday physical activity contributes to increases in BMC in young children, particularly at the trochanter.
AB - Objectives: This 3-year follow-up study examined associations between physical activity and bone mineral content (BMC) and whether physical activity augments BMC accrual. Study design: Participants were 370 children (mean age baseline 5.3 years, follow-up 8.6 years). Physical activity was measured using 4-day accelerometry. BMC was measured using dual energy x-ray absorptiometry. Results: After adjustment for baseline BMC, age, and body size, mean physical activity predicted follow-up BMC at the hip, trochanter, spine, and whole body in boys and at the trochanter and whole body in girls. The variability in BMC explained by physical activity was modest (1% to 2%). However, based on a general linear model with adjustment for baseline BMC and body size, children who maintained high levels of physical activity accrued, on average, 14% more trochanteric BMC and 5% more whole-body BMC relative to peers maintaining low levels of physical activity. Conclusions: This study suggests that maintaining high levels of everyday physical activity contributes to increases in BMC in young children, particularly at the trochanter.
UR - http://www.scopus.com/inward/record.url?scp=33745045933&partnerID=8YFLogxK
U2 - 10.1016/j.jpeds.2006.01.045
DO - 10.1016/j.jpeds.2006.01.045
M3 - Article
C2 - 16769389
AN - SCOPUS:33745045933
VL - 148
SP - 793
EP - 799
JO - Journal of Pediatrics
JF - Journal of Pediatrics
SN - 0022-3476
IS - 6
ER -