|Effects of Fuel Type for Muscle Metabolism on Exercise Thermoregulation in Dogs|
|Used with permission from Allsorts' Dog Pictures|
Thermoregulatory efficiency is a function of the rate of total body
heat production and heat dissipation. It is reflected in body temperature
and is under control of thermoregulatory centers in the hypothalamus (Greenleaf
et al. 1995). Thermoregulatory efficiency in dogs increases
with exercise duration (Kruk
at al. 1987). Increased plasma ion concentrations affect
thermoregulatory centers in the brain that influence exercise thermoregulation.
Elevated plasma osmolality in dogs is associated with higher rectal temperatures
during exercise (Greenleaf
et al. 1995). Body temperature during exercise and
thermoregulatory efficiency can be influenced by the availability of carbohydrates
and free fatty acids for energy metabolism in working muscles. Increased
availability of carbohydrates for use in energy metabolism in muscles causes
substantial changes in the exercise thermoregulation of dogs. Minor
changes in exercise thermoregulation in dogs are caused by increased availability
of free fatty acids for energy metabolism
et al. 1987).
Glucose: Infusion of glucose into the cephalic vein during exercise caused the following in dogs:
Free Fatty Acid: Consumption of soy bean oil four hours before exercise and injection of heparin immediately before exercise to increase free fatty acid levels in the blood had the following effects on dogs:
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