Heterogeneity of intrapleural pressures during exercise.

James H Jones, K. S. Cox, T. Takahashi, A. Hiraga, T. B. Yarbrough, John Pascoe

Research output: Chapter in Book/Report/Conference proceedingChapter

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Abstract

We determined whether the caudodorsal region of the intrapleural space in exercising horses experiences larger pressure fluctuations than other regions and whether systematic phase-shifting of peak intrapleural pressures along the length of the thorax suggests the existence of locomotor-induced intrapleural pressure waves. We utilised percutaneous introducers and solid-state pressure-tip transducers implanted along the dorsal aspect of the thorax, mid-thorax or oesophagus to measure regional intrapleural pressures while 3 horses galloped on a flat treadmill at 13-14 m/s, then recorded pressures from the same catheters when horses exercised intensely (heart rate 170-190 beats/min) while swimming with no ground concussion. Pressure excursions in the caudodorsal region did not vary systematically from other regions during galloping or swimming, nor more than a few torr between different locations. During swimming, peak expiratory pressures were higher than during galloping (68-79 vs. 26-32 torr), and horses breathed explosively at frequencies 5 times slower than while galloping (28 vs. 120/min). During galloping, individual catheter locations registered locomotor concussion; however, this was variable and did not indicate a systematic pressure wave passing through the lung or intrapleural space.

Original languageEnglish (US)
Title of host publicationEquine veterinary journal. Supplement
Pages391-396
Number of pages6
Edition34
StatePublished - 2002

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Jones, J. H., Cox, K. S., Takahashi, T., Hiraga, A., Yarbrough, T. B., & Pascoe, J. (2002). Heterogeneity of intrapleural pressures during exercise. In Equine veterinary journal. Supplement (34 ed., pp. 391-396)