Abstract
In many studies on obesity and thinness, findings that are simply analyses of the relationship between level of obesity or thinness, based on BMI, and health risks, or the level of correlation between BMI and physical functions, are conspicuous. The small amount of extracted data on obesity and thinness, and the difficulty of ensuring rigorous data by level of obesity and thinness, are given for that. Supposing that obesity and thinness levels could be rigorously demarcated, and data on physical information in those demarcations could be ensured, it would be possible to clearly derive the relationship between obesity level and health. Accordingly, in this study, the fluctuations in BMI with respect to rigorous categories of obesity and thinness levels were utilized, BMI fluctuations were considered to be obesity and thinness levels, and the relationship between rigorous obesity or thinness level, physical functions and physical information including health level was examined. The data used in this study were the physical information items blood pressure and motor function in 16,222 general male university students. The behavior of phase changes in physical information was then analyzed in fluctuations of single BMI units. In addition, by standardizing phase changes in physical information, the physical information with respect to BMI may be evaluated and cutoff value positioning with respect to health may be advocated. As a result, we were able to construct a standardized chart of changes in each type of physical information based on BMI fluctuations. Thus, a physique of BMI 20-22 may be conjectured to have a cutoff value meaning in terms of health. In this study, being able to establish new health indicators of obesity and thinness levels by standardizing phase changes in physical information with respect to BMI fluctuations may contribute to maintaining or improving health in the future in a wide range of ages.
