Journal of Applied Physiology
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J Appl Physiol 84: 1487-1491, 1998;
8750-7587/98 $5.00
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Vol. 84, Issue 5, 1487-1491, May 1998

Effects of chest wall vibration on breathlessness during hypercapnic ventilatory response

Hidenori Edo1, Hiroshi Kimura1, Mafumi Niijima1, Hideo Sakabe1, Masato Shibuya2, Arata Kanamaru2, Ikuo Homma2, and Takayuki Kuriyama1

1 Department of Chest Medicine, School of Medicine, Chiba University, Chiba 260; and 2 Second Department of Physiology, School of Medicine, Showa University, Tokyo 142, Japan

Vibratory stimulation applied to the chest wall during inspiration reduces the intensity of breathlessness, whereas the same stimulation during expiration has no effect or may increase breathlessness. The purpose of the present study was to determine whether vibration reduced the intensity of breathlessness during progressive hypercapnia with and without the addition of an external resistive load. A second objective was to see whether the mouth occlusion pressure at 0.2 s (P0.2) was reduced by the vibratory stimulation. Hypercapnic ventilatory response was conducted in 10 healthy male volunteers with simultaneous measurement of visual analog scale, P0.2, and minute ventilation. Hypercapnic ventilatory response was performed and randomly combined with or without vibratory stimulation (100 Hz) as well as with or without inspiratory load. With inspiratory load, in-phase vibration did not cause any significant changes in the slopes of P0.2 and minute ventilation to CO2, whereas the slope of visual analog scale to CO2 significantly decreased from 0.47 ± 0.15 to 0.34 ± 0.11 (SE) cm/Torr (P < 0.05). We conclude that in-phase vibration could decrease the slope of breathlessness elicited by inspiratory load combined with hypercapnia without changing motor output.

carbon dioxide response; load compensation; visual analog scale; in-phase vibration


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