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Gender differences in the relationships between lean body mass, fat mass and peak bone mass in young adults

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Abstract

Summary

The relationships between fat mass and bone mass in young adults are unclear. In 1,183 young Australians, lean body mass had a strong positive relationship with total body bone mass in both genders. Fat mass was a positive predictor of total body bone mass in females, with weaker association in males.

Introduction

Body weight and lean body mass are established as major determinants of bone mass, but the relationships between fat mass (including visceral fat) and peak bone mass in young adults are unclear. The aim of this study was to evaluate the associations between bone mass in young adults and three body composition measurements: lean body mass, fat mass and trunk-to-limb fat mass ratio (a surrogate measure of visceral fat).

Methods

Study participants were 574 women and 609 men aged 19–22 years from the Raine study. Body composition, total body bone mineral content (TBBMC), bone area and areal bone mineral density (TBBMD) were measured using DXA.

Results

In multivariate linear regression models with height, lean body mass, fat mass and trunk-to-limb fat mass ratio as predictor variables, lean mass was uniquely associated with the largest proportion of variance of TBBMC and TBBMD in males (semi-partial R 2 0.275 and 0.345, respectively) and TBBMC in females (semi-partial R 2 0.183). Fat mass was a more important predictor of TBBMC and TBBMD in females (semi-partial R 2 0.126 and 0.039, respectively) than males (semi-partial R 2 0.006 and 0.018, respectively). Trunk-to-limb fat mass ratio had a weak, negative association with TBBMC and bone area in both genders (semi-partial R 2 0.004 to 0.034).

Conclusions

Lean body mass has strong positive relationship with total body bone mass in both genders. Fat mass may play a positive role in peak bone mass attainment in women but the association was weaker in men; different fat compartments may have different effects.

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Acknowledgments

We acknowledge with thanks the Raine Study participants and families for being part of the study, the Raine Study Team for cohort management and data collection and the Department of Pulmonary Physiology and Sleep Medicine, Sir Charles Gairdner Hospital for providing the DXA machine. The 20 year cohort follow-up assessment was funded by project grants from the Australian National Health and Medical Research Council and funding from the Lions Eye Institute in WA. The Canadian Institutes of Health Research funded the DXA data collection. Core funding for the Raine Study is provided by the University of Western Australia, The Raine Medical Research Foundation, Telethon Institute for Childhood Health Research, Women and Infants Research Foundation, Curtin University. None of the funding agencies had any role in the conduct of the study; collection, management, analysis, or interpretation of the data; or preparation, review, or approval of the manuscript.

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Correspondence to K. Zhu.

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Zhu, K., Briffa, K., Smith, A. et al. Gender differences in the relationships between lean body mass, fat mass and peak bone mass in young adults. Osteoporos Int 25, 1563–1570 (2014). https://doi.org/10.1007/s00198-014-2665-x

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  • DOI: https://doi.org/10.1007/s00198-014-2665-x

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