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The effects of incline on cardiopulmonary function during exercise in the horse

Journal of Equine Science 6(2): 55-60

The effects of incline on cardiopulmonary function during exercise in the horse

We investigated the effects of incline on cardiopulmonary function in five trained 2-year-old Thoroughbred horses during exercise on a high-speed treadmill. The horses began exercise at 1.5 m/s for 2 min followed by 1 min step increments at 4.0, 7.0, 8.0, 9.2, and 10.4 m/s. Each horse performed the exercise test on separate days with at least 2 days interval at four different inclines (0, 3, 6 and 10%). The sequence of exercise test was randomized. The major findings were: 1) Oxygen uptake ( ovrhdot Vo-2), carbon dioxide production ( ovrhdot Vco-2), minute ventilation ( ovrhdot V-E), tidal volume (V-T), heart rate (HR), cardiac output ( ovrhdot Qt), and % O-2 extraction increased linearly with speed and incline, however the regression estimates of the change in ovrhdot VO-2/change in speed (DELTA- ovrhdot Vo-2/DELTA-SP) increased with increasing incline. 2) ovrhdot V-E increased linearly with speed and was a function of increased V-T and respiratory frequency (f), however the linear increase in ovrhdot V-E with incline was solely due to increased V-T as f was unchanged. 3) The ovrhdot V-E/ ovrhdot Vo-2 slope for 0% incline was greater than the slope 3%, 6%, 10% incline. 4) The increase in arterio-mixed venous oxygen content difference (Ca-vDO-2) with speed and incline was mainly due to the decrease in CVO-2, whereas CaO-2 increased only slightly with incline and speed. 5) The increased ovrhdot Qt with speed and incline was due to increases in HR, as stroke volume was unchanged with speed and incline.

Accession: 002984994

DOI: 10.1294/jes.6.55

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