Journal article
Muscle Power Predicts Adolescent Bone Strength: Iowa Bone Development Study
Medicine and science in sports and exercise, Vol.47(10), pp.2201-2206
10/01/2015
DOI: 10.1249/MSS.0000000000000648
PMCID: PMC4549233
PMID: 25751769
Abstract
Purpose To assess association between lower body muscle power and bone strength as well as the mediating effect of muscle cross-sectional area (MCSA) on that association.
Methods Participants (141 males and 162 females) were approximately 17 yr. Muscle power was predicted using vertical jump and the Sayers equation. Using peripheral quantitative computed tomography (pQCT), bone strength indices were obtained at two locations of the tibia, corresponding to primary stressors acting upon each site: bone strength index for compression (BSI) at the distal 4% site; density-weighted polar section modulus strength-strain index (SSIp) and cortical bone area (CoA) at the 66% midshaft site for torsion. Muscle cross-sectional area was measured at the 66% site. Pearson bivariate and partial correlation coefficients were estimated to quantify the strength of the associations among variables. Direct and indirect mediation model effects were estimated, and 95% bootstrap confidence intervals were constructed to test the causal hypothesis. Height and maturity were examined as covariates.
Results Pearson correlation coefficients among muscle power, MCSA, and bone strength were statistically significant (P < 0.01) and ranged from r = 0.54 to r = 0.78. After adjustment for covariates, associations were reduced (r = 0.37 to 0.69) (P < 0.01). Mediation models for males for BSI, SSIp, and CoA accounted for 38%, 66%, and 54% of the variance in bone strength, respectively. Models for females for BSI, SSIp, and CoA accounted for 46%, 77%, and 66% of the variance, respectively.
Conclusions We found strong and consistent associations as well as direct and indirect pathways, among muscle power, MCSA, and tibia strength. These results support the use of muscle power as a component of health-related fitness in bone health interventions for older adolescents.
Details
- Title: Subtitle
- Muscle Power Predicts Adolescent Bone Strength: Iowa Bone Development Study
- Creators
- Kathleen F. Janz - University of IowaElena M. Letuchy - University of IowaTrudy L. Burns - University of IowaShelby L. Francis - University of IowaSteven M. Levy - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Medicine and science in sports and exercise, Vol.47(10), pp.2201-2206
- Publisher
- Lippincott Williams & Wilkins
- DOI
- 10.1249/MSS.0000000000000648
- PMID
- 25751769
- PMCID
- PMC4549233
- ISSN
- 0195-9131
- eISSN
- 1530-0315
- Number of pages
- 6
- Grant note
- R01DE012101 / NATIONAL INSTITUTE OF DENTAL & CRANIOFACIAL RESEARCH; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute of Dental & Craniofacial Research (NIDCR) R01DE009551 / NATIONAL INSTITUTE OF DENTAL &CRANIOFACIAL RESEARCH; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute of Dental & Craniofacial Research (NIDCR) UL1RR024979 / NATIONAL CENTER FOR RESEARCH RESOURCES; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Center for Research Resources (NCRR) R01-DE12101; R01-DE09551 / National Institute of Dental and Craniofacial Research; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute of Dental & Craniofacial Research (NIDCR) UL1 RR024979; M01-RR00059 / National Center for Research Resources; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Center for Research Resources (NCRR) UL1TR000442 / NATIONAL CENTER FOR ADVANCING TRANSLATIONAL SCIENCES; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Center for Advancing Translational Sciences (NCATS)
- Language
- English
- Date published
- 10/01/2015
- Academic Unit
- Preventive and Community Dentistry; Epidemiology; Fraternal Order of Eagles Diabetes Research Center; Health and Human Physiology
- Record Identifier
- 9984364404502771
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