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J Appl Physiol 20: 849-854, 1965;
8750-7587/65 $5.00
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Effect of vertical vibration on respiratory airflow and transpulmonary pressure

Fred W. Zechman JR. 1, Davis Peck 1, and Edward Luce 1

1 Department of Physiology and Biophysics, University of Kentucky College of Medicine, Lexington, Kentucky

The response of the human thoracoabdominal system to whole-body, vertical, sinusoidal vibration has been studied. Peak acceleration of the shake table was held constant (±0.5 G), and frequency varied between 2 and 10 cycles/sec. Subjects were seated with trunk axes parallel with the direction of acceleration. The amplitude of forced airflow oscillation increased with frequency to an average 1,368 cm3/sec at 6 cycles/sec and then decreased. The maximum average volume of air forced in or out of the lung with vibration was 46 cm3 at 5 cycles/sec. Transpulmonary pressure fluctuation exhibited a peak average amplitude of 5.44 cm H2O at 5 cycles/sec. The response to square-wave table motion was also investigated. The transient flow oscillation produced by the step function had an average frequency of 5.6 cycles/sec. Measurements of the logarithmic decrement of transient flow oscillation indicate the total thoracoabdominal system is underdamped (hV = 0.1–0.2). The calculated damping for the lung subsystem indicates very high damping (hL = 4.5). Measurements of abdominal deformation produced by the step function suggest the transient flow oscillations result from close coupling of the lung to other components of the thoracoabdominal system.

Note:
(With the Technical Assistance of Tom Sharp, Roger Shannon, and Judith White)

whole-body vibration; periodic vertical acceleration; vibration-induced changes in respiration; oscillation; mechanics of thoracoabdominal system

Submitted on February 14, 1964




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