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The effect of race and physical activity on bone mineral density is consistent in young adult and older women
Publication year - 2008
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.22.1_supplement.883.9
Subject(s) - bone mineral , medicine , femoral neck , physical activity , lumbar spine , dual energy , femur , osteoporosis , demography , physical therapy , surgery , sociology
The positive effects of physical activity on bone mineral density (BMD) are well documented. Although black (B) women are known to have higher BMD than white (W) women across the lifespan, interactive effects of age, race and physical activity on BMD are inadequately characterized. The aim of the study was to assess the effects of habitual loading on whole body and regional measures of BMD among young (Y) and old (O), B and W, physically active (A) and inactive (I) females. Whole body (WB), proximal femur (PF), femoral neck (FN), and lumbar spine (LS) BMD measures via dual‐energy X‐ray absorptiometry were obtained in YBA (20.3±1.5 yrs, n=17), YBI (19.0±1.1 yrs, n=14), YWA (19.6±1.3 yrs, n=25), YWI (19.7±1.4 yrs, n=18), OBA (67.2±5.3 yrs, n=30), OBI (67.8±6.6 yrs, n=30), OWA (67.1±5.9 yrs, n=30), and OWI (67.4±5.1 yrs, n=30) women. Controlling for BMI, no age by race by activity interactions for any BMD measure were found (all p > 0.24). No race by activity interaction was observed either in Y or O (p > 0.19). As expected, YB and OB had higher WB (9.5%, 4.1%), PF (10.2%, 7.1%), FN (13.7%, 10.7%), and LS (10.2%, 9.7%) BMD than YW and OW, respectively (p < 0.001 to 0.03). YA had higher WB (9.9%), PF (13.0%), FN (12.3%), and LS (10.1%) BMD than YI (all p < 0.001), whereas only WB BMD was higher in OA than OI (4.6%, p = 0.03). B have higher BMD than W women, and A have higher BMD than I women in both young and older adults.