Dancing for bone health: a 3-year longitudinal study of bone mineral accrual across puberty in female non-elite dancers and controls

Matthews, B. L., Bennell, K. L., McKay, H. A., Khan, K. M., Baxter-Jones, A. D. G., Mirwald, R. L. and Wark, J. D. (2006) Dancing for bone health: a 3-year longitudinal study of bone mineral accrual across puberty in female non-elite dancers and controls. Osteoporosis International, 17 7: 1043-1054. doi:10.1007/s00198-006-0093-2


Author Matthews, B. L.
Bennell, K. L.
McKay, H. A.
Khan, K. M.
Baxter-Jones, A. D. G.
Mirwald, R. L.
Wark, J. D.
Title Dancing for bone health: a 3-year longitudinal study of bone mineral accrual across puberty in female non-elite dancers and controls
Journal name Osteoporosis International   Check publisher's open access policy
ISSN 0937-941X
1433-2965
Publication date 2006
Sub-type Article (original research)
DOI 10.1007/s00198-006-0093-2
Volume 17
Issue 7
Start page 1043
End page 1054
Total pages 12
Place of publication London, U.K.
Publisher Springer International
Language eng
Subject 1103 Clinical Sciences
Formatted abstract
Introduction Weight-bearing exercise during growth enhances peak bone mass. However, the window of opportunity for optimizing positive effects of exercise on peak bone mass remains to be fully defined. Ballet dancing provides a model of mechanical loading patterns required to site-specifically modulate bone. Methods We assessed the effects of ballet dancing on bone mineral accrual in female non-elite dancers and normally active controls for 3 years across puberty. We recruited 82 ballet dancers and 61 controls age 8–11 years at baseline. Participants were measured over 3 consecutive years; however, the overlap in ages allowed analysis of the groups across 8–14 years of age. We annually assessed bone mineral content (BMC) at the total body (TB), including upper and lower limb regions, and biannually assessed BMC at the proximal femur and lumbar spine (LS) using dual x-ray absorptiometry (DXA). We derived TB lean mass and fat mass from DXA TB scans. Anthropometry, exercise levels, and calcium intake were also measured biannually. Maturational age was determined by age at peak height velocity (PHV). A multilevel regression model was used to determine the independent effects of body size, body composition, maturation, exercise levels, and calcium intake at each measurement occasion. Results When adjusted for growth and maturation, dancers had significantly greater BMC at the TB, lower limbs, femoral neck (FN), and LS than controls. Excepting the FN region, these differences became apparent at 1 year post-PHV, or the peripubertal years, and by 2 years post-PHV the differences represented a cumulative advantage in dancers of 0.6–1.3% (p<0.05) greater BMC than controls. At the FN, dancers had 4% (p<0.05) greater BMC than controls in prepuberty and maintained this advantage throughout the pubertal years. Conclusions Results from this novel population provide evidence for modest site-specific and maturity-specific effects of mechanical loading on bone.
Keyword Bone mineral accrual
Exercise
Girls
Growth
Longitudinal
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Human Movement and Nutrition Sciences Publications
 
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Created: Fri, 13 Mar 2009, 12:05:52 EST by Ms Sarada Rao on behalf of School of Human Movement and Nutrition Sciences