Journal of Applied Physiology
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J Appl Physiol 80: 2190-2197, 1996;
8750-7587/96 $5.00
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Journal of Applied Physiology, Vol 80, Issue 6 2190-2197, Copyright © 1996 by American Physiological Society

ARTICLES

Effect of three different warm-up regimens on heat balance and oxygen consumption of thoroughbred horses

R. J. Lund, A. J. Guthrie, H. J. Mostert, C. W. Travers, J. P. Nurton and D. J. Adamson
Equine Research Centre, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa.

Horses were exercised at 105% of their maximal O2 uptake until fatigued after three different warm-up regimens (no warm-up, a light warm-up, and a warm-up until the central venous temperature was > 39.5 degrees C) to assess the effect of the warm-up on the various avenues of heat loss. Approximately 12.79, 15.10, and 18.40 MJ of heat were generated in response to the warm-up and exercise after the three different warm-up regimens, respectively. Of the heat generated, 17.5, 17.2, and 17.4% remained as stored heat after 20 min of active recovery. Heat loss from the respiratory system was 63.6, 33.7, and 40.3% of the heat produced during and after the three warm-up intensities, respectively. The balance of the heat loss was assumed to be via the evaporation of sweat. On this basis, the heat loss by sweating was 14.9, 49.1, and 42.3% of the heat produced during and after the three warm-up intensities, which represented evaporation of 0.8, 3.1, and 3.0 liters of sweat, respectively. O2 consumption during exercise and heart rates 20 min postexercise, after two of the warm-up regimens, was significantly lower than that after no prior warm-up.


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