Effect of physical activity and nutrition on bone mineral density in young Japanese women

Department of Obstetrics and Gynecology, Faculty of Medicine, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan.
Journal of Bone and Mineral Metabolism (Impact Factor: 2.46). 02/2007; 25(6):414-8. DOI: 10.1007/s00774-007-0780-x
Source: PubMed


We explored factors that contributed to bone mineral density (BMD) in Japanese young women by quantifying the factors related to BMD. Between October 2003 and February 2004, we conducted a cross-sectional survey to study the status of nutritional intake and physical activity, and evaluated the various physical and serum parameters in relation to BMD. Subjects included 254 healthy female students who were 19-25 years old and were attending the Nursing School of Tokyo Women's Medical University, Japan. We measured the lumbar BMD (L2-L4) in these women. Multiple regression analysis was used to predict factors that contributed to current L2-L4 BMD. Our results showed that body mass index (BMI) (standardized regression coefficient = 0.45, P < 0.0001), past exercise habit (standardized regression coefficient = 0.15, P < 0.0059), and current total energy expenditure (standardized regression coefficient = 0.12, P < 0.03) were factors that significantly predicted the current L2-L4 BMD, with BMI as a key contributing factor. A BMI of 20.8 kg/m(2) allowed acquisition of young adult mean (YAM) irrespective of the total energy expenditure. In subjects with low BMI, L2-L4 BMD increased with higher current energy expenditure. A BMI of 20.8 kg/m(2) or greater and an energy expenditure of 32.9 METS-h/day or greater are required to acquire the YAM. We concluded that BMI and physical activity were factors that affected the BMD of Japanese young women.

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    • "Although there were a few studies on the relationship between BMD and nutrient intake as well as BMD and physical fitness there are insufficient studies on the compositional correlations among the three factors, nutrient intake, BMD and basal physical fitness, in elderly women. Kristinsson [12] reported positive correlations among BMD on the upper arm, calcium intake and grip strength in girls aged 13 to 15, while Yuko et al. [13] reported a significant correlation among physical activity, nutrition and BMD in young Japanese women. These studies did not identify the exact correlation between BMD and physical fitness because they used partial BMD data rather than Total-BMD and did not include information about the subjects' physical fitness levels. "
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