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

FRITZ, JESPER LU ; Rosengren, Björn LU ; Dencker, Magnus LU ; Karlsson, Caroline LU and Karlsson, Magnus LU (2016) In Acta Pædiatrica
Abstract

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... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Bone mineral content, Bone mineral density, Children, Muscle strength, Physical activity
in
Acta Pædiatrica
publisher
Taylor & Francis
external identifiers
  • Scopus:84970046237
ISSN
0803-5253
DOI
10.1111/apa.13440
language
English
LU publication?
yes
id
b82c9710-8a78-4bf6-9b3b-4e6f28180832
date added to LUP
2016-06-16 08:15:14
date last changed
2016-10-23 04:43:54
@misc{b82c9710-8a78-4bf6-9b3b-4e6f28180832,
  abstract     = {<p>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/cm<sup>2</sup> (0.01-0.08) more total spine aBMD (p &lt;0.05) and 6.2Nm (1.6, 10.7) more knee flexion strength (p &lt;0.01) than control group girls and had a 0.1 mm (0.0, 0.3) higher tibial cortical thickness at follow-up (p &lt;0.05). Boys in the intervention group gained 7.3Nm (0.4, 14.2) more knee extension strength (p &lt;0.05) and 7.4Nm (2.3, 12.4) more knee flexion strength (p &lt;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.</p>},
  author       = {FRITZ, JESPER and Rosengren, Björn and Dencker, Magnus and Karlsson, Caroline and Karlsson, Magnus},
  issn         = {0803-5253},
  keyword      = {Bone mineral content,Bone mineral density,Children,Muscle strength,Physical activity},
  language     = {eng},
  month        = {05},
  publisher    = {ARRAY(0x8d099b0)},
  series       = {Acta Pædiatrica},
  title        = {A seven-year physical activity intervention for children increased gains in bone mass and muscle strength},
  url          = {http://dx.doi.org/10.1111/apa.13440},
  year         = {2016},
}