A seven-year physical activity intervention for children increased gains in bone mass and muscle strength

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T1 - A seven-year physical activity intervention for children increased gains in bone mass and muscle strength

AU - FRITZ, JESPER

AU - Rosengren, Björn

AU - Dencker, Magnus

AU - Karlsson, Caroline

AU - Karlsson, Magnus

PY - 2016/10

Y1 - 2016/10

N2 - Aim: This study evaluated the musculoskeletal effects of increased physical activity on children, starting at six to nine years of age. Methods: In one school we increased the physical education of 72 girls and 100 boys to 200 minutes per week over seven years. In three other schools, 45 girls and 47 boys continued to receive 60 minutes per week. We measured areal bone mineral density (aBMD) with dual energy X-ray absorptiometry and muscle strength with computerised dynamometer at baseline and after seven years and tibial cortical thickness with peripheral quantitative computed tomography after seven years. Results: Girls in the intervention group gained 0.04 g/cm2 (0.01-0.08) more total spine aBMD (p <0.05) and 6.2Nm (1.6, 10.7) more knee flexion strength (p <0.01) than control group girls and had a 0.1 mm (0.0, 0.3) higher tibial cortical thickness at follow-up (p <0.05). Boys in the intervention group gained 7.3Nm (0.4, 14.2) more knee extension strength (p <0.05) and 7.4Nm (2.3, 12.4) more knee flexion strength (p <0.01) than the control group boys, but their aBMD was no higher than the control group. Conclusion: A seven-year, population-based moderately intense exercise intervention enhanced gains in spine bone mass in girls and knee muscle strength in both genders.

AB - Aim: This study evaluated the musculoskeletal effects of increased physical activity on children, starting at six to nine years of age. Methods: In one school we increased the physical education of 72 girls and 100 boys to 200 minutes per week over seven years. In three other schools, 45 girls and 47 boys continued to receive 60 minutes per week. We measured areal bone mineral density (aBMD) with dual energy X-ray absorptiometry and muscle strength with computerised dynamometer at baseline and after seven years and tibial cortical thickness with peripheral quantitative computed tomography after seven years. Results: Girls in the intervention group gained 0.04 g/cm2 (0.01-0.08) more total spine aBMD (p <0.05) and 6.2Nm (1.6, 10.7) more knee flexion strength (p <0.01) than control group girls and had a 0.1 mm (0.0, 0.3) higher tibial cortical thickness at follow-up (p <0.05). Boys in the intervention group gained 7.3Nm (0.4, 14.2) more knee extension strength (p <0.05) and 7.4Nm (2.3, 12.4) more knee flexion strength (p <0.01) than the control group boys, but their aBMD was no higher than the control group. Conclusion: A seven-year, population-based moderately intense exercise intervention enhanced gains in spine bone mass in girls and knee muscle strength in both genders.

KW - Bone mineral content

KW - Bone mineral density

KW - Children

KW - Muscle strength

KW - Physical activity

UR - http://www.scopus.com/inward/record.url?scp=84970046237&partnerID=8YFLogxK

U2 - 10.1111/apa.13440

DO - 10.1111/apa.13440

M3 - Article

C2 - 27096878

VL - 105

SP - 1216

EP - 1224

JO - Acta Pædiatrica

JF - Acta Pædiatrica

SN - 1651-2227

IS - 10

ER -