An Increase in School-Based Physical Education Increases Muscle Strength in Children

作者：Lofgren Bjarne^*; Daly Robin M; Nilsson Jan Ake; Dencker Magnus; Karlsson Magnus K

来源：Medicine and Science in Sports and Exercise, 2013, 45(5): 997-1003.

DOI：10.1249/MSS.0b013e31827c0889

• BODY COMPOSITION
• FRACTURE RISK
• SCHOOL-BASED INTERVENTION
• PHYSICAL ACTIVITY
• ISOKINETIC PEAK TORQUE
• VERTICAL JUMP HEIGHT

LOFGREN, B., R. M. DALY, J. NILSON, M. DENCKER, and M. K. KARLSSON. An Increase in School-Based Physical Education Increases Muscle Strength in Children. Med. Sci. Sports Exerc., Vol. 45, No. 5, pp. 997-1003, 2013. 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(-1) of school physical education for 2 yr, whereas the controls achieved 60 min.wk(-1). 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(-1) 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(-1) was significantly higher for both girls (P %26lt; 0.001) and boys (P %26lt; 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(-1) (P %26lt; 0.001), and girls had a greater gain in vertical jump height (P %26lt; 0.05). Conclusion: An increase in school-based physical education from 60 to 200 min.wk(-1) enhanced muscle strength in prepubertal children without affecting fracture risk.

• 出版日期2013-5
• 单位迪肯大学