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Evidence of sustained skeletal benefits from impact-loading exercise in young females: a 3-year longitudinal study

Record type: Article

The skeletal effects from intensive exercise throughout puberty are undefined. Forty-five female gymnasts and 52 controls were studied over 3 years, including a heredity aspect. The effects of size, maturity, exercise, and diet were identified using a multilevel regression model. Results demonstrated sustained skeletal benefits resulting from exercise throughout all stages of pubertal development.
Introduction: Weight-bearing exercise is beneficial for peak bone mass development. However, whether skeletal benefits achieved with exercise are maintained if training remains intensive throughout the pubertal years is not entirely clear. The influence of familial resemblance for bone mass remains undefined in physically active versus inactive children. The aim of this study was to investigate the long-term influences of impact-loading exercise on bone quantity and quality in young females after controlling for growth, maturation, and hereditary factors.
Materials and Methods: At baseline, 45 gymnasts (G) and 52 normally active controls (C) 8-17 years of age were recruited. Anthropometry, diet, physical activity, and quantitative ultrasound (QUS) were measured annually for 3 consecutive years. DXA scans of total body (TB) and lumbar spine (LS) bone mineral content (BMC) and density (BMD) were taken three times at 1-year intervals. A multilevel regression model was fitted, and the independent effects of body size, maturity, physical activity, and diet were identified over time. To assess heredity influences, 27 G mothers and 26 C mothers volunteered for cross-sectional measurements of anthropometry, QUS, and BMC/BMD.
Results and Conclusions: Gymnasts were smaller and lighter (as were their mothers) than controls, but they had significantly higher QUS and axial and appendicular BMC and BMD, with >170 g more bone mineral in TB across puberty (after adjustment for maturity [years from peak height velocity], height, weight, energy, and protein intake). Gymnasts had up to 24-51% higher BMC and 13-28% higher BMD, depending on skeletal site. These results provide evidence of sustained skeletal benefits from impact-loading exercise, which are unlikely to result entirely from heredity, throughout pubertal years

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Citation

Nurmi-Lawton, J.A., Baxter-Jones, A.D., Mirwald, R.L., Bishop, J.A., Taylor, P., Cooper, C. and New, S.A. (2004) Evidence of sustained skeletal benefits from impact-loading exercise in young females: a 3-year longitudinal study Journal of Bone and Mineral Research, 19, (2), pp. 314-322. (doi:10.1359/JBMR.0301222).

More information

Published date: 2004
Keywords: peak bone mass, exercise, girls, heredity, longitudinal

Identifiers

Local EPrints ID: 25851
URI: http://eprints.soton.ac.uk/id/eprint/25851
ISSN: 0884-0431
PURE UUID: 986786ae-3821-470b-8ba9-df8bb87a8f30

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Date deposited: 11 Apr 2006
Last modified: 17 Jul 2017 16:09

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Contributors

Author: J.A. Nurmi-Lawton
Author: A.D. Baxter-Jones
Author: R.L. Mirwald
Author: J.A. Bishop
Author: P. Taylor
Author: C. Cooper
Author: S.A. New

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