Journal article
Sustained effects of physical activity on bone health: Iowa Bone Development Study
Bone, Vol.63, pp.95-100
06/2014
DOI: 10.1016/j.bone.2014.03.004
PMCID: PMC4040461
PMID: 24632502
Abstract
Studies of youth athletics and interventions have shown some maintenance of bone mineral content (BMC; g) after cessation of training, but less is known about sustained effects of everyday physical activity (PA). Using a prospective cohort, this report examined potential effects of childhood PA on adolescent BMC. Participants (N=156 boys, 170 girls) had exams at ages 5, 13, and 15. Body size and maturity were determined using anthropometry. Moderate-to-vigorous-intensity PA (MVPA) and vigorous-intensity PA (Vigorous PA) were measured using accelerometry. BMC of the spine and hip was measured using dual-energy X-ray absorptiometry. Mixed regression models tested whether PA at age 5 affected BMC at ages 13 and 15 after adjustment for age (year), height (cm), weight (kg), maturity (pre-peak height velocity or post), and activity level (min/day). Analysis was repeated to control for age 5 BMC. On average, boys participated in 59, 52, and 38min of MVPA and 13, 17, and 11min of Vigorous PA at ages 5, 13, and 15, respectively. MVPA (β=0.799) and Vigorous PA (β=1.338) at age 5 predicted later spine BMC (p<0.05). MVPA (β=0.480) at age 5 predicted hip BMC. Girls participated in 47, 33, and 26min of MVPA and 10, 9 and 7min of Vigorous PA at ages 5, 13, and 15, respectively. Neither MVPA nor Vigorous PA predicted later spine BMC. MVPA (β=0.302) at age 5 predicted hip BMC. After controlling for BMC at age 5 as well as the other covariates, the effect of MVPA (β=0.695) and Vigorous PA (β=1.079) at age 5 remained significant for boys at the spine. For girls, neither MVPA nor Vigorous PA at age 5 predicted spine or hip BMC. Children's early PA appears to have a modest effect on adolescent BMC at the critical regions of spine and hip; benefits may be greater for geometric changes, which future studies should include. •We examine the effect of childhood physical activity on adolescent bone mineral content.•Children's physical activity has a modest effect on adolescent bone mineral content.•Age 5 physical activity contributed to later bone mineral content more in boys than girls.
Details
- Title: Subtitle
- Sustained effects of physical activity on bone health: Iowa Bone Development Study
- Creators
- Shelby L Francis - Department of Health and Human Physiology, University of Iowa, Iowa City, IA, USAElena M Letuchy - Department of Epidemiology, University of Iowa, Iowa City, IA, USASteven M Levy - Department of Epidemiology, University of Iowa, Iowa City, IA, USAKathleen F Janz - Department of Health and Human Physiology, University of Iowa, Iowa City, IA, USA
- Resource Type
- Journal article
- Publication Details
- Bone, Vol.63, pp.95-100
- DOI
- 10.1016/j.bone.2014.03.004
- PMID
- 24632502
- PMCID
- PMC4040461
- NLM abbreviation
- Bone
- ISSN
- 8756-3282
- eISSN
- 1873-2763
- Publisher
- Elsevier Inc
- Language
- English
- Date published
- 06/2014
- Academic Unit
- Preventive and Community Dentistry; Epidemiology; Health, Sport, and Human Physiology
- Record Identifier
- 9983917657602771
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