Skip Navigation LinksHome > December 2013 - Volume 45 - Issue 12 > Effects of Physical Activity and Muscle Quality on Bone Deve...
Medicine & Science in Sports & Exercise:
doi: 10.1249/MSS.0b013e31829c32fe
Applied Sciences

Effects of Physical Activity and Muscle Quality on Bone Development in Girls

FARR, JOSHUA N.1; LADDU, DEEPIKA R.2; BLEW, ROBERT M.3; LEE, VINSON R.3; GOING, SCOTT B.2

Collapse Box

Abstract

Introduction: Poor muscle quality and sedentary behavior are risk factors for metabolic dysfunction in children and adolescents. However, because longitudinal data are scarce, relatively little is known about how changes in muscle quality and physical activity influence bone development.

Purpose: In a 2-yr longitudinal study, we examined the effects of physical activity and changes in muscle quality on bone parameters in young girls.

Methods: The sample included 248 healthy girls age 9–12 yr at baseline. Peripheral quantitative computed tomography was used to measure calf and thigh muscle density, an indicator of skeletal muscle fat content or muscle quality, as well as bone parameters at diaphyseal and metaphyseal sites of the femur and tibia. Physical activity was assessed using a validated questionnaire specific for youth.

Results: After controlling for covariates in multiple regression models, increased calf muscle density was independently associated with greater gains in cortical (β = 0.13, P < 0.01) and trabecular (β = 0.25, P < 0.001) volumetric bone mineral density and the bone strength index (β = 0.25, P < 0.001) of the tibia. Importantly, these relationships were generalized, as similar changes were present at the femur. Associations between physical activity and changes in bone parameters were weaker than those observed for muscle density. Nevertheless, physical activity was significantly (all P < 0.05) associated with greater gains in trabecular volumetric bone mineral density and the bone strength index of the distal femur.

Conclusions: These findings suggest that poor muscle quality may put girls at risk for suboptimal bone development. Physical activity is associated with more optimal gains in weight-bearing bone density and strength in girls, but to a lesser extent than changes in muscle quality.

© 2013 American College of Sports Medicine

Login

Article Tools

Share

Search for Similar Articles
You may search for similar articles that contain these same keywords or you may modify the keyword list to augment your search.

Connect With Us