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J Appl Physiol 81: 1379-1387, 1996;
8750-7587/96 $5.00
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Journal of Applied Physiology, Vol 81, Issue 3 1379-1387, Copyright © 1996 by American Physiological Society

ARTICLES

Inhibitory effect of an intellectual task on breathing after voluntary hyperventilation

K. Chin, M. Ohi, M. Fukui, H. Kita, T. Tsuboi, T. Noguchi, N. Otsuka, H. Hirata, M. Mishima and K. Kuno
Department of Clinical Physiology, Kyoto University, Japan.

We investigated the effects of an intellectual task on posthyperventilation (PHV) breathing by using a video game. Eight normal subjects were placed in a supine positions. The game task by itself led to increase ventilation compared with the control tasks via an increase in the average inspiratory flow rate (P < 0.01) and the respiratory frequency (P < 0.001). After hypocapnic voluntary hyperventilation (VHV), the task led to a decrease in the 1-min PHV breathing level compared with the control tasks after VHV [after VHV, first 60 s average minute ventilation while watching television and while playing a video game are 5.54 +/- 2.91 (SD) and 2.05 +/- 1.40 l/min, respectively; P < 0.01]. Only one subject showed PHV apnea for at least 10 s during the control protocol, whereas seven of the same eight subjects showed PHV apnea while performing the task. After isocapnic VHV, the task still led to a decrease in PHV breathing compared with the control tasks. However, this decrease was smaller than in the hypocapnic studies and was only significant during the first 15 s of recovery. These results suggest that increased activity in the higher centers of the central nervous system has an inhibitory effect on PHV breathing at a time when the effects of short-term potentiation after VHV, hypocapnia, and perhaps other mechanisms would be expected to be acting on breathing.


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