Measurement of Human Body Volume Employing a Static Puff.

概要

論文の詳細を見る
A new device is proposed for measuring human body volume. The device consists of two chambers: a reference chamber of known volume and a measuring chamber in which a subject is seated. The nominal total volume of the subject, the substantial body volume plus the volume of the lungs, is measured by an acoustic method which was proposed previously by the authors. While the lung volume is calculated based on Boyle's law from the change due to a puff in the volume and the pressure of the subject lungs. After the measurement of the nominal total volume about the maximum inspiration the subject is instructed to puff statically against the occluded airway. The rise in the lung pressure is picked up by a pressure transducer and the decrease in the lung volume is measured from that in the nominal total volume. Since a static puff is employed in this method the compression of the gas is isothermal in the subject lungs. Boyle's law, therfore, applies exactly to the change of gas state in the lungs, as is not the case in conventional plethysmographic methods utilizing a panting. An experimental apparatus was built and the proposed method was verified by several model experiments. The scope of future works to embody the method is also discussed.
公益社団法人計測自動制御学会の論文