Time Relation among Clothing Pressure Developed at Waistband, Respiratory Movement, and Girth of Abdomen -Using by Hydrostatic Pressure-balanced Method-

Abstract

Time relation among clothing pressure developed at waistband, respiratory movement, and girth of abdomen were investigated. The time constants of 3 sensors to monitor these waves in this measuring system were examined, and were 0.016s, 268.9ms, and 57.0ms corresponded to that order. Therefore, this measuring system for the clothing pressure could sufficiently follow the changes of waistband-pressure which might be caused by either respiratory movements or changes in posture, and the most suitable method to measure the clothing pressure. Subjects were 10 women aged from 20 to 22 years old, and 3 waves measured under 3 conditions: non waistband, wearing waistband with a perfect fitting length and a tight fitting length in free respiration. These waves analyzed by Fourier transform to examine these constitutional frequencies which were 3.85±0.99s, 3.85±0.92s, 3.72±0.85s and nearly equal. By the way, the time lags of peak in girth of abdomen and in respiratory movement were calculated from their cross spectra, the time became significantly late. So, the timing of air flowed into the body became significantly late, because of worn waistband. We distinguish whether the body region influenced by respiratory movement, and have to investigate a permissible limit of the pressure including a change of a respiratory function in the future.