Journal of Applied Physiology
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J Appl Physiol 78: 1447-1451, 1995;
8750-7587/95 $5.00
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Journal of Applied Physiology, Vol 78, Issue 4 1447-1451, Copyright © 1995 by American Physiological Society

ARTICLES

Comparison of aerobic capacity between racing standardbred horses

G. M. Gauvreau, H. Staempfli, L. J. McCutcheon, S. S. Young and W. N. McDonell
Department of Clinical Studies, University of Guelph, Ontario, Canada.

A standardized treadmill test was used to compare metabolic and ventilatory measurements between 10 standardbred racehorses. The horses were divided into two groups: group A (n = 5) had mean racing speeds of 4.4 s faster than group B (n = 5) over a 1-mi. distance. Each horse was fitted with a venous catheter and connected to a valved gas-collection system. The exercise test consisted of 1-min incremental workloads ranging from 4.0 to 12.0 m/s at a treadmill incline of 3 degrees. Group A had significantly higher (P < 0.05) measurements of maximal O2 consumption (VO2max), O2 pulse, and tidal volume. Venous lactate concentration and respiratory exchange ratio measured at VO2max were also significantly higher (P < 0.05) in group A. Similar treadmill velocities were required to achieve a respiratory exchange ratio of > 1 and venous blood lactate concentration of > 4 mmol/l; however, group A was able to complete a significantly higher (P < 0.01) number of workloads before fatigue. The high aerobic and anaerobic capacity of group A horses may be a major contributor to a faster racing performance.


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D. J. Padilla, P. McDonough, C. A. Kindig, H. H. Erickson, and D. C. Poole
Ventilatory dynamics and control of blood gases after maximal exercise in the Thoroughbred horse
J Appl Physiol, June 1, 2004; 96(6): 2187 - 2193.
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