Is ventilation during maximal exercise limited by dynamic airway closure?

S. Hobo, A. Hiraga, E. K. Birks, T. Takahashi, T. Hada, James H Jones

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Scopus citations


A study was undertaken to find if the reason why horses hypoventilate when running is that they experience expiratory flow limitation due to dynamic airway closure. To test this hypothesis, we measured peak expiratory flows on a Thoroughbred galloping on a treadmill and hypoventilating and compared those flows with the peak dynamically-limited flow that the same horse could achieve during a forced expiratory flow-volume manoeuvre. At the approximate lung volumes at which the horse was ventilating while running, it did not appear to be mechanically limited and appeared to have reserve capacity available potentially to increase its expiratory flow.

Original languageEnglish (US)
Title of host publicationEquine veterinary journal. Supplement
Number of pages6
StatePublished - 1999
Externally publishedYes


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