Changes in breathing pattern at loads near perceptual threshold at different work levels

A. Yasukouchi, F. Serita

研究成果: Contribution to journalArticle査読

5 被引用数 (Scopus)

抄録

Five subjects were tested to determine the threshold for detection of au added resistance to inspiration in three tests, one at rest and two with exercise (mild = 50 W; moderate = 100 W) on a cycle ergometer. Changes in the breathing pattern were examined at added resistances near the perceptual threshold. Added inspiratory resistances with a 50% probability of detection were very variable at rest; they decreased significantly from rest (250 Pa · l-1 · s-1) to moderate exercise (98 Pa · l-1 · s-1) in four subjects. It is suggested that physical exercise may cause discomfort even when workers wearing a respirator do not have any abnormal sensation during sedentary work. Breathing patterns were compared between resistance loaded and unloaded breathing during each test. Decreases in inspiratory peak flow and acceleration of flow early in inspiration were found in resistance loaded breathing in almost all tests and a tendency for tidal volume to decrease was found during moderate exercise only. The ratios of resistance loaded to unloaded breathing for inspiratory time (ti) and total time (tt) tended to be greater in the detected than in the undetected responses at rest and during mild exercise but not during moderate exercise. This would imply that further prolongation of ti and tt in the detected responses was attributable to conscious or subconscious aspects of the resistance loading responses; however, these adjustments in breathing, which reduce frequency, would be less likely to occur as the work rate increases.

本文言語英語
ページ(範囲)337-345
ページ数9
ジャーナルEuropean Journal of Applied Physiology and Occupational Physiology
60
5
DOI
出版ステータス出版済み - 9 1990
外部発表はい

All Science Journal Classification (ASJC) codes

  • 公衆衛生学、環境および労働衛生
  • 生理学

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