Journal article
Effects of dehydration on thermoregulatory responses of horses during low-intensity exercise
Journal of applied physiology (1985), Vol.75(2), pp.994-1001
08/01/1993
Handle:
https://hdl.handle.net/2376/111003
PMID: 8226506
Abstract
Effects of dehydration on thermoregulatory and metabolic responses were studied in six horses during 40 min of exercise eliciting approximately 40% of maximal O2 consumption and for 30 min after exercise. Horses were exercised while euhydrated (C), 4 h after administration of furosemide (FDH; 1.0 mg/kg i.v.) to induce isotonic dehydration, and after 30 h without water (DDH) to induce hypertonic dehydration. Cardiac output was significantly lower in FDH (144.1 +/- 8.0 l/min) and in DDH (156.6 +/- 6.9 l/min) than in C (173.1 +/- 6.2 l/min) after 30 min of exercise. When DDH, FDH, and C values were compared, dehydration resulted in higher temperatures in the middle gluteal muscle (41.9 +/- 0.3, 41.1 +/- 0.2, and 40.6 +/- 0.2 degrees C, respectively) and pulmonary artery (40.8 +/- 0.3, 40.1 +/- 0.2, and 39.7 +/- 0.2 degrees C, respectively). Temperatures in the superficial thoracic vein and subcutaneous sites on the neck and back and peak sweating rates on the neck and back were not significantly different in DDH and C. In view of higher core temperatures during exercise after dehydration and decrease in cardiac output without concomitant increases in peripheral temperatures or reduced sweating rates, we conclude that the impairment of thermoregulation was primarily due to decreased transfer of heat from core to periphery.
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Details
- Title
- Effects of dehydration on thermoregulatory responses of horses during low-intensity exercise
- Creators
- J. R Naylor - Department of Veterinary Clinical Medicine and Surgery, College of Veterinary Medicine, Washington State University, Pullman 99164W. M Bayly - Department of Veterinary Clinical Medicine and Surgery, College of Veterinary Medicine, Washington State University, Pullman 99164P. D Gollnick - Department of Veterinary Clinical Medicine and Surgery, College of Veterinary Medicine, Washington State University, Pullman 99164G. L Brengelmann - Department of Veterinary Clinical Medicine and Surgery, College of Veterinary Medicine, Washington State University, Pullman 99164D. R Hodgson - Department of Veterinary Clinical Medicine and Surgery, College of Veterinary Medicine, Washington State University, Pullman 99164
- Publication Details
- Journal of applied physiology (1985), Vol.75(2), pp.994-1001
- Academic Unit
- Veterinary Clinical Sciences, Department of
- Identifiers
- 99900547229501842
- Language
- English
- Resource Type
- Journal article