Influence of body composition, muscle strength, diet and physical activity on total body and forearm bone mass in Chinese adolescent girls
The aim of the present study was to determine association between body composition, muscle strength, diet and physical exercise with bone mineral content (BMC) and bone area (BA) in 283 Chinese adolescent girls aged 15 years in Beijing, China. Body composition, pubertal stage, physical activity an...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Cambridge University Press
2007
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| Subjects: | |
| Online Access: | http://eprints.usm.my/36121/ http://eprints.usm.my/36121/1/Foo_LH_BJN_2007.pdf |
| Summary: | The aim of the present study was to determine association between body composition, muscle strength, diet and physical exercise with bone mineral
content (BMC) and bone area (BA) in 283 Chinese adolescent girls aged 15 years in Beijing, China. Body composition, pubertal stage, physical
activity and dietary intakes were assessed using standard validated protocols. Total body and forearm bone, lean body mass (LBM) and fat
body mass (FBM) were determined by dual X-ray absorptiometry. Multivariate linear regression analyses were carried out to examine the predictors
of BMC and BA, after controlling for potential confounders. The subjects had a mean age of 15·0 (SD 0·9) years and 99·6% of them had
reached menarche. Multivariate analyses showed that LBM, FBM, handgrip muscle strength and milk intake were significant independent determinants
of BMC and BA of the total body and/or forearm sites. LBM was found to be a stronger independent determinant than FBM of BMC and
BA, whereas handgrip muscle strength was only found as significant determinant of BMC and BA at the forearm sites than in total body BMC and
BA. Further, total physical activity level had a significant positive association with handgrip and LBM. This suggested that greater muscle strength
and higher LBM may reflect higher levels of physical activity. Therefore, continuous healthy lifestyle practices such as adequate intake of milk and
continuous participation in physical activity should be encouraged throughout adolescence to optimise bone growth during this period. |
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