Relationship between Bone Mineral Density and BMI and that between Bone Mineral Density and Body Fat Ratio in a Complete Medical Examination

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  • 総合健診における骨密度とＢＭＩおよび体脂肪率との関係

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Various opinions exist regarding the relationship between bone mineral density and body mass index (BMI) and that between bone mineral density and body fat ratio. Currently, however, there is no established theory on these relationships. Therefore, we set out to investigate these relationships through analyses of data from participants who underwent medical examinations and bone mineral analyses at our human dry dock center. We began by analyzing the relationship between BMI and body fat ratio and came to the conclusion that there is a close positive correlation between BMI and body fat ratio. We then analyzed the relationship between bone mineral density and BMI and that between bone mineral density and body fat ratio. The results showed that there are no significant relationships between them as a whole, although there are significant relationships in a small portion of the age groups. There is a possibility that the results were influenced by the fact that we employed monovariate analysis, which does not include factors that have an effect on bone mineral density; for example, lifestyle, existence of diseases, muscle volume and so on. In addition, selection biases may have also had an influence on the results-that is to say, the subjects of these analyses were people who were supposed to have a high level of health consciousness and be living a healthy lifestyle. These problems need to be analyzed more carefully in the future through multivariate analysis that takes into consideration lifestyle, diseases, muscle volume and other such factors.

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