Lean mass and physical activity as predictors of bone mineral density in 16-20-year old women.

Abstract:

OBJECTIVE:The aim of the study was to quantify the inter-relationship between bone mineral density and physical activity, muscle strength, and body mass composition in a group of healthy 16-20-year-old women. DESIGN:A cross-sectional study. SETTING:Reykjavik area. SUBJECTS:Two-hundred and fifty-four Icelandic Caucasian women aged 16, 18 and 20 years, randomly selected from the registry of Reykjavik. MAIN OUTCOME MEASURES:Bone mineral content (BMC) and density (BMD) in lumbar spine, hip, distal forearm and total skeleton and lean mass and fat mass were measured with dual energy X-ray absorptiometry (DEXA) and compared with grip strength measured with a dynamometer and physical activity as assessed by a questionnaire. RESULTS:The lean mass had the strongest correlation with BMC and BMD, stronger than weight, height and fat mass, both in univariate analysis (r = 0.41-0.77; P<0.001) and in linear regression analysis. The total skeletal BMD was logarithmically higher by hours of exercise per week (P<0.001)). About 30% of variability in total skeletal BMD in this age group can be predicted by lean mass and physical exercise. CONCLUSIONS:Modifiable factors, such as exercise and adequate muscle seem to be significant predictors of the attainment of peak bone mass in women.

journal_name

J Intern Med

authors

Valdimarsson O,Kristinsson JO,Stefansson SO,Valdimarsson S,Sigurdsson G

doi

10.1046/j.1365-2796.1999.00486.x

subject

Has Abstract

pub_date

1999-05-01 00:00:00

pages

489-96

issue

5

eissn

0954-6820

issn

1365-2796

journal_volume

245

pub_type

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