Rehydration fluid temperature affects voluntary drinking in horses dehydrated by furosemide administration and endurance exercise.
Abstract: To determine whether temperature of rehydration fluid influences voluntary rehydration by horses, six 2-3-year-old horses were dehydrated (4-5% body weight loss) by a combination of furosemide administration and 30 km of treadmill exercise. For the initial 5 min following exercise, horses were offered a 0.9% NaCl solution at 10, 20, or 30 degrees C. Subsequently, after washing and cooling out, voluntary intake of water at 10, 20, or 30 degrees C from 20 to 60 min after exercise was measured. Fluid intake (FI) during the first 5 min of recovery was 9.8+/-2.5,12.3+/-2.1 and 9.7+/-2.0L (p>0.05) for saline at 10, 20, and 30 degrees C, respectively. Although not a significant finding, horses offered 0.9% NaCl at 20 degrees C tended to take fewer (p=0.07), longer drinks than when saline at either 10 or 30 degrees C was offered. Between 20 and 60 min of recovery, intake of water at 20 degrees C (7.7+/-0.8L) and 30 degrees C (6.6+/-1.2L) was greater (p<0.05) than that at 10 degrees C (4.9+/-0.5L). Thus, total FI was 14.7+/-2.5,19.9+/-2.5, and 16.3+/-2.4L for rehydration fluids at 10, 20, and 30 degrees C, respectively (p<0.05, value for 20 degrees C water greater than that for 10 degrees C water). Although the amount of metabolic heat transferred to the initial saline drink was correlated with the decrease in core temperature during the initial 5 min of recovery, heat transfer to ingested fluid was most likely responsible for the dissipation of, at most, 5% of the heat generated during endurance exercise. In conclusion, following exercise these dehydrated-normothermic horses voluntary drank the greatest amount of fluid at near ambient (20 degrees C) temperature. Although not determined in this study, greater satiation of thirst by oropharyngeal cooling may have contributed to lesser intake of colder (10 degrees C) fluid.
Publication Date: 2003-11-19 PubMed ID: 14623154DOI: 10.1016/s1090-0233(03)00054-6Google Scholar: Lookup
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- Journal Article
- Research Support
- Non-U.S. Gov't
Summary
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This research paper investigates how the temperature of rehydration fluids impact the voluntary intake of water in horses that have been dehydrated due to furosemide administration and vigorous exercise. The study determined that horses voluntarily consumed more fluids at near ambient temperatures, with lower consumption rates for cooler fluids.
Methodology of Research
- The researchers used six horses aged between 2-3 years for this experiment. They dehydrated these horses by administering furosemide, a diuretic that encourages urine production, and put them through 30 kilometers of treadmill exercise. The aim was to create an average loss of 4-5% of the horse’s original body weight.
- Post-exercise, the horses were given a saline solution at temperatures of 10, 20, or 30 degrees Celsius for five minutes.
- After cooling and washing the horses, they were then allowed to voluntarily drink water at these same temperatures from approximately 20 to 60 minutes following the exercise.
Observations and Findings
- During the initial recovery period (first 5 minutes), intake volumes of saline were found to be similar irrespective of its temperature. There was a slight tendency of horses consuming fewer but longer drinks of saline when the temperature was at 20 degrees Celsius.
- In the period between 20 and 60 minutes post-exercise, the horses consumed larger quantities of water at 20 and 30 degrees Celsius compared to when it was at 10 degrees Celsius.
- Total fluid intake was the greatest when rehydration fluids were set at 20 degrees Celsius.
- The decrease in core body temperature in the initial recovery phase showed a correlation with the amount of metabolic heat transferred to the consumed saline. Although, this heat transfer was accountable for dissipating only 5% of the heat generated during endurance exercise.
Conclusions
- The study concluded that horses that had been exercised to the point of dehydration showed a preference for fluid intake at near ambient temperatures.
- There was a suggestion that a possible greater satiation of thirst due to oropharyngeal cooling (cooling of the throat and mouth region) could be a reason for lower consumption of colder fluids. However, this was not definitively determined in this study.
Cite This Article
APA
Butudom P, Barnes DJ, Davis MW, Nielsen BD, Eberhart SW, Schott HC.
(2003).
Rehydration fluid temperature affects voluntary drinking in horses dehydrated by furosemide administration and endurance exercise.
Vet J, 167(1), 72-80.
https://doi.org/10.1016/s1090-0233(03)00054-6 Publication
Researcher Affiliations
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine, D-202 Veterinary Medical Center, Michigan State University, East Lansing, MI 48824-1314, USA.
MeSH Terms
- Animals
- Dehydration / chemically induced
- Dehydration / therapy
- Dehydration / veterinary
- Diuretics / administration & dosage
- Diuretics / adverse effects
- Drinking / physiology
- Female
- Fluid Therapy / methods
- Fluid Therapy / veterinary
- Furosemide / administration & dosage
- Furosemide / adverse effects
- Horse Diseases / chemically induced
- Horse Diseases / therapy
- Horses
- Male
- Physical Conditioning, Animal / adverse effects
- Physical Conditioning, Animal / physiology
- Rehydration Solutions / chemistry
- Sodium Chloride / administration & dosage
- Temperature
- Thirst / physiology
Citations
This article has been cited 7 times.- Todini L, Fantuz F. Thirst: neuroendocrine regulation in mammals. Vet Res Commun 2023 Sep;47(3):1085-1101.
- Cannes do Nascimento N, Dos Santos AP, Sivasankar MP, Cox A. Unraveling the molecular pathobiology of vocal fold systemic dehydration using an in vivo rabbit model. PLoS One 2020;15(7):e0236348.
- Oleson S, Cox A, Liu Z, Sivasankar MP, Lu KH. In Vivo Magnetic Resonance Imaging of the Rat Vocal Folds After Systemic Dehydration and Rehydration. J Speech Lang Hear Res 2020 Jan 22;63(1):135-142.
- Hosseinlou A, Khamnei S, Zamanlu M. Voluntary drinking versus imposed drinking in the methodology of investigations about the drinking-induced thermoregulatory sweating. Int J Clin Exp Med 2014;7(10):3757-62.
- Khamnei S, Hosseinlou A, Zamanlu M. Water temperature, voluntary drinking and fluid balance in dehydrated taekwondo athletes. J Sports Sci Med 2011;10(4):718-24.
- Hosseinlou A, Khamnei S, Zamanlu M. The effect of water temperature and voluntary drinking on the post rehydration sweating. Int J Clin Exp Med 2013;6(8):683-7.
- Olorunfemi MA, Binhambali A, Sinkalu VO, Babashani M, Samuel FU, Ayo JO. Effects of age and circadian rhythm on vital parameters and erythrocyte osmotic fragility of donkeys during seasonal changes. PLoS One 2025;20(1):e0313780.
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