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Influence of cold, exercise, and caffeine on catecholamines and metabolism in men

Influence of cold, exercise, and caffeine on catecholamines and metabolism in men PREMILA University SATHASIVAM, KEN W. MAcNAUGHTON 2 WI, Canada of Human Biology, of Guelph, Guelph, Ontario NIG GRAHAM, TERRY E., PREMLA SATHASIVAM, KEN W. MACNAUGHTON. Influence of , on catecholamines metabolism in men. J. Appl. Physiol. 70(5): 2052-2058, 1991.-Recently we found that ingestion did not enhance either thermal or fat metabolic responses to ing in cold air, despite an increasein plasma epinephrine free fatty acids. Theophylline, another methylxanthine, has been shown to be effective during but not at during cold stress.Therefore we hypothesized that ingestionbefore in cold air would have a thermal-metabolic impact by increasing fat metabolism increasing oxygen consumption. Young adult men (n = 6) who did not normally have in their diet performed four double-blind trials. Thirty minutes after ingesting (dextrose, 5 mg/ kg) or (5 mg/kg) they either d(60 W) or ed for 2 h in 5°C air. Cold increased(P < 0.05)plasmanorepinephrine while both increased(P < 0.05) epinephrine. Serum free fatty acids glycerol were increased, but there were no differencesbetween or . had no influence on either respiratory exchange ratio or oxygen consumption either at or during .The trials did not significantly warm the body, they resulted in higher plasma norepinephrine concentrations lower meanskin temperatures http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Physiology The American Physiological Society

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