Studies on the Method of Estimation of Human Body Density

Hachisuka Hirohisa, Mizuno Isamu, Yamaoka Seiichi, Yoshimura Hisato

doi:10.4327/jsnfs1949.23.40

In an attempt to calculate the fat content in the body, a simple and easy method to estimate the human body density was devised by measuring the body weight under water and residual air in the lung at the same time.<BR>In the authors' method, the following procedures were employed. After the subject breathes pure oxygen filled in a spirometer three times from the maximum expired state, he breathes out the air from lung into spirometer to the maximum level and then dives under water and his weight is measured in water tank. To measure the residual air in the lung, nitrogen dilute method was used by analysing the expired air in the spirometer.<BR>Reproducibility of the measurements of the human body density by this method is excellent (standard-deviation for an average is about±0.0008), and this precision is comparable to that of the previous reports.<BR>On juvenile subjects who cannot hold their breath long enough for the measurements, the measurements of weight under water after the maximum expiration is difficult. The measurement was wade, therefore, at the middle expiration state which was about 60% of vital capacity. And the values were converted to that of maximum expiration state. The reproducibility was within±0. 0022.

Studies on the Method of Estimation of Human Body Density

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