A 5-year exercise program in children improves muscle strength without affecting fracture risk

European Journal of Applied Physiology
Jesper FritzMagnus K Karlsson

Abstract

High level of physical activity (PA) is associated with great muscle strength and high fracture risk. This prospective controlled population-based study evaluated how a pediatric PA intervention program influenced muscle strength and fracture risk. We carried out a school-based exercise intervention program with 200 min of PA per week for 5 years in 335 girls and 408 boys aged 6-9 years at study start. An age-matched control cohort including 756 girls and 782 boys continued with 60 min of PA per week. We registered fractures during the study period and calculated rate ratio. In a sub-sample, including 74 girls and 107 boys in the intervention and 51 girls and 54 boys in the control group, we measured knee flexion and extension strength by a computerized dynamometer and leg composition by dual energy X-ray absorptiometry. Group comparisons were adjusted for differences in age, baseline value for the measured parameter and changes in height. Children in the intervention group had a rate ratio to sustain a fracture of 1.03 (0.78, 1.36) (mean and 95 % confidence interval) (p = 0.79). The annual gain in flexion peak torque muscle strength was greater in both girls (at 60°/s) [1.1 Nm (0.5, 1.8), p < 0.01] and boys (at 180°/s) [0.7 Nm...Continue Reading

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Citations

Nov 24, 2017·International Journal of Adolescent Medicine and Health·Annika EkströmMarie Alricsson
Apr 7, 2020·Current Osteoporosis Reports·Magnus K Karlsson, Björn E Rosengren
Oct 28, 2020·Current Obesity Reports·Dessi P ZaharievaDavid M Maahs
Feb 28, 2018·American Journal of Lifestyle Medicine·Kirsten Legerlotz
Sep 24, 2021·The Cochrane Database of Systematic Reviews·Sarah E Neil-SztramkoMaureen Dobbins

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