An increase in school-based physical education increases muscle strength in children

Lofgren, Bjarne, Daly, Robin M, Nilsson, Jan-Ake, Dencker, Magnus and Karlsson, Magnus K 2013, An increase in school-based physical education increases muscle strength in children, Medicine and science in sports and exercise, vol. 45, no. 5, pp. 997-1003, doi: 10.1249/MSS.0b013e31827c0889.

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Title An increase in school-based physical education increases muscle strength in children
Author(s) Lofgren, Bjarne
Daly, Robin MORCID iD for Daly, Robin M
Nilsson, Jan-Ake
Dencker, Magnus
Karlsson, Magnus K
Journal name Medicine and science in sports and exercise
Volume number 45
Issue number 5
Start page 997
End page 1003
Total pages 7
Publisher Lippincott, Williams & Wilkins
Place of publication Philadelphia, Pa.
Publication date 2013-05
ISSN 0195-9131
Keyword(s) body compostion
fracture risk
school-based intervention
physical activity
isokinetic peak torque
vertical jump height
Science & Technology
Life Sciences & Biomedicine
Sport Sciences
Summary PURPOSE: Children and adolescents are encouraged to maintain a habitually active lifestyle because of the known health benefits associated with regular physical activity, but there are some reports that a high level of activity may be associated with increased fracture risk. This prospective controlled exercise intervention study in prepubertal children evaluated if a school-based exercise intervention could enhance growth-related gains in muscle strength and muscular function without affecting fracture risk. METHODS: Fractures were registered in 417 girls and 500 boys age 7-9 yr in the intervention and in 836 age-matched girls and 872 boys. The intervention included 40 min.d of school physical education for 2 yr, whereas the controls achieved 60 min.wk. In a subsample consisting of 49 girls and 80 boys in the intervention and 50 girls and 53 boys in the control group, body composition was measured by dual-energy x-ray absorptiometry, muscle strength by isokinetic peak torque (PT) of the knee extensors, and flexors at 60 and 180 degrees .s by a computerized dynamometer and neuromuscular performance by vertical jump height. RESULTS: The rate ratio (95% confidence interval) for children in the intervention group to sustain a fracture was 1.07 (0.66-1.68). The annual gain in knee extensor PT at 180 degrees .s was significantly higher for both girls (P < 0.001) and boys (P < 0.01) in the intervention compared with the control group. Boys in the intervention group also had a greater annual gain in knee flexion PT at 180 degrees .s (P < 0.001), and girls had a greater gain in vertical jump height (P < 0.05). CONCLUSION: An increase in school-based physical education from 60 to 200 min.wk enhanced muscle strength in prepubertal children without affecting fracture risk.
Language eng
DOI 10.1249/MSS.0b013e31827c0889
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
1106 Human Movement And Sports Science
Socio Economic Objective 920116 Skeletal System and Disorders (incl. Arthritis)
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2013, the American College of Sports Medicine
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Document type: Journal Article
Collections: Faculty of Health
School of Exercise and Nutrition Sciences
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