Summary
To investigate the possibility of selective brain cooling in the horse, a species with a high capacity for exercise, which sweats & lacks a carotid rete, we monitored hypothalamic (Thy), central venous (Tmv) & rectal (Tre) temperatures in two geldings during exercise, with fanning, on a treadmill. Tmv increased 3.5–4.1°C (to c.42°C), Thy was a maximum of 1.3 ± 0.4°C lower, and Tre was c.1°C below Thy. The existence of selective brain cooling in the horse, an animal that closely resembles man in thermoregulatory function, supports the contention that selective cooling of the brain can occur without a carotid rete.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Olschewski, H. & Brück, K. (1988). Thermoregulatory, cardiovascular and muscular factors related to exercise after precooling. J. Appl. Physiol. 64: 803–811.
Baker, M.A. (1982). Brain cooling in endotherms in heat and exercise. Ann. Rev. Physiol. 44: 85–96.
Cabanac, M. (1986). Keeping a cool head. News in Physiol. Sci. 1:41–44
Brengelmann, G.L., 1987. In: Man in Stressful Environments. Eds. K. Shiraki & M.K. Yousef. Springfield: Thomas, p.5–22.
Nielsen, B. & Jessen, C. (1992). Evidence against brainstem cooling by face fanning in severely hyperthermic human. Pflugers Arch. 422: 168–172.
Hare, W.D. (1975). Equine respiratory system. In: Sisson & Grossman’s; The Anatomy of the Domestic Animals. 5th ed. Ed. P. Getty. Philadelphia: WB Saunders 1975, p 498.
Pleschka, K. (1984). Control of tongue blood flow in regulation of heat loss in mammals. Rev. Physiol. Biochem. Pharmacol. 100: 75–120.
Evans, C.L. & Smith, D.F.G. (1956). Sweating responses in the horse. Proc. Roy. Soc. B. (London). 145: 61–83.
Popesko, P. (1979). Atlas of Topographical Anatomy of the Domestic Animals. Vol. 1, 3rd Ed. Philadelphia: W.B. Saunders., p.129.
Magilton, J.H. & Swift, C. (1967). Thermoregulation of the canine brain by alar fold and interarteriovenous heat exchange system. Physiologist. 10: 241.
Cabanac, M. & Caputa, M. (1979). Natural selective cooling of the human brain: Evidence of its occurrence and magnitude. J. Physiol. (Lond.) 286: 255–264.
Taylor, C.R. & Lyman, C.P. (1972). Heat storage in running antelopes: Independence of brain and body temperatures. Am. J. Physiol. 222: 114–117.
Saltin, B. & Hermansen, L. (1966). Esophageal, rectal, and muscle temperature during exercise. J. Appl. Physiol. 21: 1757–1762.
Hodgson, D.R., McCutcheon L.J., Byrd S.K., Brown, W.S., Bayly, W.M., Brengelmann, G.L. & Gollnick, P.D. (1993). Dissipation of metabolic heat in the horse during exercise. J. Appl. Physiol. 74: 1161–1170.
Manohar, M. (1987). Furosemide and systemic circulation during severe exercise. In: Equine Exercise Physiology 2. Eds. J.R. Gillespie & N.E. Robinson NE. Davis, California: ICEEP Pub., p.132–147.
Aulick, L. H., Robinson, S. & Tzankoff, S. P. (1981). Arm and leg intravascular temperatures of men during submaximal exercise. J. Appl. Physiol. 51: 1092–1097.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1994 Springer Basel AG
About this chapter
Cite this chapter
McConaghy, F.F., Hales, J.R.S., Hodgson, D.R. (1994). Selective Brain Cooling in the Horse during Exercise. In: Milton, A.S. (eds) Temperature Regulation. Advances in Pharmacological Sciences. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-8491-4_31
Download citation
DOI: https://doi.org/10.1007/978-3-0348-8491-4_31
Publisher Name: Birkhäuser, Basel
Print ISBN: 978-3-0348-9646-7
Online ISBN: 978-3-0348-8491-4
eBook Packages: Springer Book Archive