Consistent small transient increases in airway resistance were observed to occur following maximal inspirations by a number of normal subjects. The same effect was also seen after merely attempting inspiration against a closed glottis, and both this and the response after deep inhalation were blocked by prior inhalation of a bronchodilator. An active bronchomotor mechanism is postulated for this response. Submitted on January 24, 1962
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T. C. Lloyd (1963) studied this question.