Exercise in the heat: Thermoregulatory limitations to performance in humans and horses

Canadian Journal of Applied Physiology

Volumn 24, Issue 2, 1999, Pages 152-163

  Lindinger, Michael I ^a  

^a UNIVERSITY OF GUELPH   (Canada)

Author keywords

Blood volume; Cardiovascular; Equine; Fluid shift; Skeletal muscle

Indexed keywords

ADENOSINE TRIPHOSPHATE;

ADRENERGIC SYSTEM; ANAEROBIC THRESHOLD; ANIMAL; BODY SURFACE; BRAIN; COMPARATIVE STUDY; FATIGUE; FLUID THERAPY; HEAT; HORSE; HUMAN; HYPOTHALAMUS; INNERVATION; METABOLISM; MUSCLE CONTRACTION; PATHOPHYSIOLOGY; PHYSIOLOGY; REVIEW; SKELETAL MUSCLE; SKIN; SPORT; THERMOREGULATION; VASCULARIZATION; VASODILATATION;

ADENOSINE TRIPHOSPHATE; ANAEROBIC THRESHOLD; ANIMALS; BODY SURFACE AREA; BODY TEMPERATURE REGULATION; BRAIN; FATIGUE; FLUID THERAPY; HEAT; HORSES; HUMANS; HYPOTHALAMUS; MUSCLE CONTRACTION; MUSCLE, SKELETAL; SKIN; SPORTS; SYMPATHETIC NERVOUS SYSTEM; VASODILATION;

EID: 0033113907     PISSN: 10667814     EISSN: None     Source Type: Journal    
DOI: 10.1139/h99-013     Document Type: Article

References (48)

1. Ardevol, A., Adan, C., Remesar, X., Fernandez-Lopez, J.A., and Alemany, M. (1998). Hind leg heat balance in obese Zucker rats during exercise. Pflügers Arch. - Eur. J. Physiol. 435:454-464.
2. Armstrong, L.E., Maresh, C.M., Gabaree, C.V., Hoffman, J.R., Kavouras, S.A., Kenefick, R.W., Castellani, J.W., and Ahlquist, L.E. (1997). Thermal and circulatory responses during exercise: Effects of hypohydration, dehydration, and water intake. J. Appl. Physiol. 82: 2028-2035.
3. Armstrong, R.B., Delp, M.D., Goljan, E.F., and Laughlin, M.H. (1987). Progressive elevations in muscle blood flow during prolonged exercise in swine. J. Appl. Physiol. 63: 285-291.
4. Baptiste, K.E. (1998). A preliminary study on the role of guttural pouches in selective brain cooling. Vet. J. 155: 139-148.
5. Brengelmann, G.L. (1993). Specialized brain cooling in humans? FASEB J. 7: 1148-1153.
6. Brinnel, H., Cabanac, M., and Hales, J.R.S. (1987). Critical upper levels of body temperature, tissue thermosensitivity and selective brain cooling in hyperthermia. In: J.R.S. Hales and D.A.B. Richards (Eds.), Heat Stress: Physical Exertion and Environment, pp. 209-222. Amsterdam: Elsevier Scientific.
7. Brooks, G.A., Hittleman, K.J., Faulkner, J.A., and Beyer, R.A. (1971). Temperature, skeletal muscle mitochondrial functions, and oxygen debt. Am. J. Physiol. 220: 1053-1059.
8. Byrd, S.K., McCutcheon, L.J., Hodgson, D.R., and Gollnick, P.D. (1989). Altered sarcoplasmic reticulum function after high-intensity exercise. J. Appl. Physiol. 67: 2072-2077.
9. Caputa, M., Feistkorn, G., and Jessen, C. (1986). Effects of brain and trunk temperatures on exercise performance in goats. Pflügers Arch. - Eur. J. Physiol. 406: 184-189.
10. Ecker, G.E., and Lindinger, M.I. (1996). Gastric emptying, intestinal absorption and distribution of an electrolyte solution in horses. Physiologist 39: A-52 [abstract #22.5]
11. Febbraio, M.A., Snow, R.J., Hargreaves, M., Stathis, C.G., Martin, I.K., and Carey, M.F. (1994). Muscle metabolism during exercise and heat stress in trained men: Effect of acclimation: J. Appl. Physiol. 76: 589-597.
12. Febbraio, M.A., Snow, R.J., Stathis, C.G., Hargreaves, M., and Carey, M.F. (1996). Blunting the rise in body temperature reduces muscle glycogenolysis during exercise in humans. Exp. Physiol. 81: 685-693.
13. Fuller, A., Carter, R.N., and Mitchell, D. (1998). Brain and abdominal temperatures at fatigue in rats exercising in the heat. J. Appl. Physiol. 84: 877-883.
14. Galloway, S.D., and Maughan, R.J. (1997). Effects of ambient temperature on the capacity to perform prolonged cycle exercise in man. Med. Sci. Sports Exerc. 29:1240-1249.
15. Geor, R.J., and McCutcheon, L.J. (1998a). Thermoregulatory adaptations associated with training and heat acclimation. In: K.W. Hinchcliff (Ed.), Veterinary Clinics of North America: Equine Practice, Fluids and Electrolytes in Athletic Horses (Vol. 14), pp. 97-120. Philadelphia: Saunders.
16. Geor, R.J., and McCutcheon, L.J. (1998b). Hydration effects on physiological strain of horses during exercise-heat stress. J. Appl. Physiol. 84: 2042-2051.
17. Geor, R.J., McCutcheon, L.J., Ecker, G.L., and Lindinger, M.I. (1995). Thermal and cardiorespiratory responses of horses to submaximal exercise under hot and humid conditions. Equine Vet. J. (Suppl. 20): 125-132.
18. Gisolfi, C.V., and Copping, J.R. (1974). Thermal effects of prolonged treadmill exercise in the heat. Med. Sci. Sports Exerc. 6: 108-113. (Reprinted, 1993, Med. Sci. Sports Exerc. 25: 310-315)
19. Guthrie, A.J., and Lund, R.J. (1998). Thermoregulation. Base mechanisms and hyperthermia. In: K.W. Hinchcliff (Ed.), Veterinary Clinics of North America: Equine Practice, Fluids and Electrolytes in Athletic Horses (Vol. 14), pp. 45-59. Philadelphia: Saunders.
20. Hargreaves, M., Angus, D., Howlett, K., Conus, N.M., and Febbraio, M. (1996a). Effect of heat stress on glucose kinetics during exercise. J. Appl. Physiol. 81: 1594-1597.
21. Hargreaves, M., Dillo, P., Angus, D., and Febbraio, M. (1996b). Effect of fluid ingestion on muscle metabolism during prolonged exercise. J. Appl. Physiol. 80: 363-366.
22. Hodgson, D.R., McCutcheon L.J., Byrd, S.K., Brown, W.S., Bayly, W.M., Brengelmann, G.L., and Gollnick, P.D. (1993). Dissipation of metabolic heat in the horse during exercise. J. Appl. Physiol. 74: 1161-1170.
23. Jacobsson, S., and Kjellmer, I. (1964). Accumulation of fluid in exercising skeletal muscle. Acta Physiol. Scand. 60: 286-292.
24. Kozlowski, S., and Saltin, B. (1964). Effect of sweat loss on body fluids. J. Appl. Physiol. 19: 119-124.
25. Latzka, W.A., Sawka, M.N., Montain, S.J., Skrinar, G.S., Fielding, R.A., Matott, R.P., and Pandolf, K.B. (1998). Hyperhydration: Tolerance and cardiovascular effects during uncompensable exercise-heat stress. J. Appl. Physiol. 84: 1858-1864.
26. Laughlin, M.H., and Armstrong, R.B. (1983). Rat muscle blood flows as a function of time during prolonged slow treadmill exercise. Am. J. Physiol. 244: H814-H824.
27. Lee, D.T., and Haymes, E.M. (1995). Exercise duration and thermoregulatory responses after whole body precooling. J. Appl. Physiol. 79: 1971-1976.
28. Lindinger, M.I., Geor, R.J., Ecker, G.L., and McCutcheon, L.J. (1995). Plasma volume and ions during exercise in cool dry, hot dry and hot humid conditions. Equine Vet. J. (Suppl. 20): 133-139.
29. Lindinger, M.I., Spriet, L.L, Hultman, E., Putman, T., McKelvie, R.S., Lands, L.C., Jones, N.L., and Heigenhauser, G.J.F. (1994). Plasma volume and ion regulation during exercise after low-and high-carbohydrate diets. Am. J. Physiol. 266: R1896-1906.
30. MacDougall, J.D., Reddan, W.G., Layton, C.R., and Dempsey, J.A. (1974). Effects of metabolic hyperthermia on performance during heavy prolonged exercise. J. Appl. Physiol. 36: 538-544.
31. Marlin, D.J., Scott, C.M., Schroter, R.C., Mills, P.C., Harris, R.C., Harris, P.A., Orme, C.E., Roberts, C.A., Marr, C.M., Dyson, S.J., and Barrelet, F. (1996). Physiological responses in nonheat acclimated horses performing treadmill exercise in cool (20 °C/ 40% RH), hot dry (30 °C/40% RH) and hot humid (30 °C/80% RH) conditions. Equine Vet. J. (Suppl. 22): 70-84.
32. Maughan, R.J., and Lindinger, M.I. (1995). Preparing for and competing in the heat: The human perspective. Equine Vet. J. (Suppl. 20): 8-15.
33. McConaghy, F.F., Hales, J.R.S., Rose, R.J., and Hodgson, D.R. (1995). Selective brain cooling in the horse during exercise and environmental heat stress. J. Appl. Physiol. 79: 1849-1854.
34. McConaghy, F.F., Hodgson, D.R., Rose, R.J., and Hales, J.R.S. (1996). Redistribution of cardiac output in response to heat exposure in the pony. Equine Vet. J. (Suppl. 22): 42-47.
35. Nielsen, B., Hales, J.R.S., Strange, S., Christensen, N.J., Warberg, J., and Saltin, B. (1993). Human circulatory and thermoregulatory adaptations with heat acclimation and exercise in a hot dry environment. J. Physiol. (Lond.) 460: 467-485.
36. Nielsen, B., Strange, S., Christensen, N.J., Warberg, J., and Saltin, B. (1997). Acute and adaptive responses in humans to exercise in a warm, humid environment. Pflügers Arch. - Eur. J. Physiol. 434: 49-56.
37. Parkin, J.M., Carey, M.F., Zhao, S., and Febbraio, M.A. (In press). Effect of ambient temperature on human skeletal muscle metabolism during fatiguing submaximal exercise. J. Appl. Physiol.
38. Ray, C.A., and Gracey, K.H. (1997). Augmentation of exercise-induced muscle sympathetic nerve activity during muscle heating. J. Appl. Physiol. 82: 1719-1725.
39. Saltin, B., and Hermansen, L. (1966). Esophageal, rectal, and muscle temperature during exercise. J. Appl. Physiol. 21: 1757-1762.
40. Savard, G.K., Nielsen, B., Laszczynska, J., Larsen, B.E., and Saltin, B. (1988). Muscle blood flow is not reduced in humans druing moderate exercise and heat stress. J. Appl. Physiol. 64: 649-657.
41. Sawka, M.N., and Pandolf, K.B. (1990). Effects of body water loss on physiological function and exercise performance. In: C.V. Gisolfi and D.R. Lamb (Eds.), Perspectives in Exercise Science and Sports Medicine: Vol. 3. Fluid Homeostasis During Exercise, pp. 1-38. Carmel, IN: Benchmark Press.
42. Segal, S.S., Faulkner, J.A., and White, T.P. (1986). Skeletal muscle fatigue in vitro is temperature dependent. J. Appl. Physiol. 61: 660-665.
43. Simon, E. (1998). Nitric oxide as a peripheral and central mediator in temperature regulation. Amino Acids 14: 87-93.
44. Ward, M.R., and Thesleff, S. (1974). The temperature dependence of action potentials in rat skeletal muscle fibres. Acta Physiol. Scand. 91: 574-576.
45. Werner, J. (1993). Temperature regulation during exercise: An overview. In: C.V. Gisolfi, D.R. Lamb, and E.R. Nadel (Eds.), Perspectives in Exercise Science and Sports Medicine: Vol. 6. Exercise, Heat, and Thermoregulation, pp. 49-84. Dubuque, IA: Brown & Benchmark.
46. Willis, W.T., and Jackman, M.R. (1994). Mitochondrial function during heavy exercise. Med. Sci. Sports Exerc. 26: 1347-1353.
47. Young, A.J., Sawka, M.N., Levine, L., Cadarette, B.S., and Pandolf, K.B. (1985). Skeletal muscle metabolism during exercise is influenced by heat acclimation. J. Appl. Physiol. 59: 1929-1935.
48. Zhou, S., Carey, M.F., Snow, R.J., Lawson, D.L., and Morrison, W.E. (1998). Effects of muscle fatigue and temperature on electromechanical delay. Electromyogr. Clin. Neurophysiol. 38: 67-73.