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Related Experiment Video

Updated: May 21, 2026

Dosage-Adjusted Resistance Training in Mice with a Reduced Risk of Muscle Damage

Dosage-Adjusted Resistance Training in Mice with a Reduced Risk of Muscle Damage

Published on: August 31, 2022

A 4-year exercise program in children increases bone mass without increasing fracture risk.

Bjarne Löfgren¹, Magnus Dencker, Jan-Åke Nilsson

¹Clinical and Molecular Osteoporosis Research Unit, Department of Clinical Sciences, Lund University, Lund, Sweden. bjarne.lofgren@med.lu.se

|May 30, 2012

Summary

A 4-year school exercise program for children aged 7-9 improved bone development. This study tracked skeletal growth and fracture incidence, finding increased bone mass and size without altering fracture risk.

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Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts

Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts

Published on: January 29, 2018

Area of Science:

Pediatric exercise science
Skeletal development research
Bone health interventions

Background:

Pediatric exercise studies often lack long-term fracture data.
Bone traits are frequently used as indirect measures for fractures.
This study prospectively evaluated skeletal development and fracture incidence over 4 years.

Purpose of the Study:

To assess the long-term impact of a school-based exercise program on children's skeletal development.
To investigate the relationship between exercise, bone mass, bone size, and fracture incidence in children.
To provide long-term fracture data beyond surrogate bone traits.

Main Methods:

Prospective registration of fractures in 7- to 9-year-old children over 4 years.
Intervention group: 40 minutes/day of school physical education; Control group: 60 minutes/week.
Dual-energy radiograph absorptiometry used to monitor bone mineral content and width in a subsample.

Main Results:

The fracture rate ratio was 1.11, indicating no significant difference between groups.
Children in the intervention group showed greater annual gains in bone mineral content (girls: 7.0%, boys: 3.3%) and femoral neck width (girls: 1.7%, boys: 0.6%).
No baseline differences in age, anthropometrics, or bone traits were observed between groups.

Conclusions:

A 4-year, moderately intense exercise program for children aged 7-9 significantly increased bone mass and size.
The observed improvements in bone development did not lead to an increased risk of fractures.
Population-based exercise interventions can positively influence skeletal health in children without compromising safety.