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CARBOHYDRATE INTAKE DURING EXERCISE RE-DUCES CORE TEMPERATURE
Thursday, February 21, 2008 |  Printer Friendly
CARBOHYDRATE INTAKE DURING EXERCISE RE-DUCES CORE TEMPERATURE
Eur J Appl Physiol Occup Physiol 56(5): 577-82, 1987.
Enhanced glucose availability for working muscles reduces exercise hyperther-
mia in dogs.
Kruk, B., K. Nazar, et al.
Body temperature and metabolic responses to 2 h treadmill exercise in
dogs given glucose intravenously (25-30 mg.kg-1 X min-1 throughout the run)
were compared with those measured in the same animals with elevated plasma
FFA concentrations (soya bean oil ingestion + intravenous heparin) and in con-
trol experiments (24 h fasting). In comparison with control conditions enhanced
glucose availability for the working muscles caused a reduction in the exercise-
induced increases in both rectal (by 0.9 +/- 0.11 degree C) and muscle (by 0.9
+/- 0.16 degree C) temperatures, a lower rate of oxygen uptake (by 16%) and
an elevated respiratory exchange ratio. A tendency towards enhanced body
temperature responses to exercise, accompanied by increases in VO2 and car-
diac frequency was noted in dogs with elevated plasma FFA concentrations as
compared with the control animals. The estimated amount of heat effectively
dissipated from the body, expressed as a fraction of heat load (thermoregulatory
efficiency) was significantly higher in dogs infused with glucose (0.962 +/-
0.0035), than in the controls (0.947 +/- 0.0043) and those with elevated plasma
FFA concentrations (0.931 +/- 0.0029). It is concluded that the increased
contribution of carbohydrates to the energy yield during exercise results
in a marked attenuation of hyperthermia, associated with a reduced meta-
bolic rate and improved thermoregulatory efficiency.
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