Abstract
The effects of mechanically induced vibration upon the human abdomen were determined by measuring the pressure in the rectal end of the colon sigmoideum. A technique was developed for transmitting the internal pressure to external recorders, and the amplitudes of the colon pressure fluctuations were determined, when eight human subjects and one Rhesus monkey were subjected to vertical sinusoidal vibration, at vector accelerations of less than one g, in the frequency range of one through twenty c/s. The pressure fluctuations were found to vary with frequency, showing maximum mean “peak to peak” pressure, per one g acceleration, of 57 mm Hg at 4.5 c/s and 4 c/s, sitting erect and sitting relaxed; and 30 mm Hg at 7 c/s in the semi-supine posture of human subjects. These resonances confirm the results of related prior studies of the human body as a mechanical system.
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