A 3-year school-based exercise intervention improves muscle strength - a prospective controlled population-based study in 223 children

BMC Musculoskeletal Disorders

Magnus K Karlsson¹  Björn E Rosengren¹  Magnus Dencker²  Caroline Karlsson¹  Jan-Åke Nilsson¹  Fredrik Detter¹ 

[1]Clinical and Molecular Osteoporosis Research Unit, Department of Orthopedics and Clinical Sciences, Skåne University Hospital, SE-205 02 Malmö, Sweden

[2]Department of Physiology, Lund University, Skåne University Hospital, SE-205 02 Malmö, Sweden

关键词: School-based intervention;    Physical activity;    Muscle strength;    Knee flexion;    Knee extension;    Girls;    Isokinetic peak torque;    Boys;    Body composition;   

Others  :  1118638
DOI  :  10.1186/1471-2474-15-353

 received in 2014-05-01, accepted in 2014-10-15,  发布年份 2014

【 摘 要 】

Background

Intense physical activity (PA) improves muscle strength in children, but it remains uncertain whether moderately intense PA in a population-based cohort of children confers these benefits.

Methods

We included children aged 6–9 years in four schools where the intervention school increased the school curriculum of PA from 60 minutes/week to 40 minutes/school day while the control schools continued with 60 minutes/week for three years. We measured muscle strength, as isokinetic Peak Torque (PT) (Nm) of the knee flexors in the right leg at speeds of 60°/second and 180°/second, at baseline and at follow-up, in 47 girls and 76 boys in the intervention group and 46 girls and 54 boys in the control group and then calculated annual changes in muscle strength. Data are provided as means with 95% confidence intervals.

Results

Girls in the intervention group had 1.0 Nm (0.13, 1.9) and boys 1.9 Nm (0.9, 2.9) greater annual gain in knee flexor PT at 60°/second, than girls and boys in the control group. Boys in the intervention group also had 1.5 Nm (0.5, 2.5) greater annual gain in knee flexors PT at 180°/second than boys in the control group.

Conclusion

A 3-year moderately intense PA intervention program within the school curriculum enhances muscle strength in both girls and boys.

【 授权许可】

   
2014 Detter et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

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