Progressive enhancement of body temperature responses to consecutive exercise-bouts of the same intensity in dogs.
Progressive enhancement of body temperature responses to consecutive exercise-bouts of the same intensity in dogs. Acta physiol. pol., 1985, 36 (3): 165-174. Changes in rectal (Tre), muscle (Tm), and hypothalamic (Thy) temperatures, plasma osmolality, and some intermediary metabolic variables were examined in dogs performing four successive exercise-bouts of the same intensity. During the rest-intervals separating the exercise-bouts body temperatures returned to initial levels and water losses were replaced. Tm and Tre responses to consecutive exercise-bouts were progressively increasing. Similar tendency was found in Thy changes. Cardiac and respiratory frequencies attained the same levels in all four exercise-bouts, while blood lactate and FFA concentrations were increasing and blood glucose level was decreasing progressively. No changes in plasma osmolality was noted. Exercise-induced increases in Tm correlated positively with plasma FFA concentration (r = 0.68). Body temperature responses to exercise were reduced by beta-adrenergic blockade. It is concluded that the enhancement of the thermal responses to consecutive exercise-bouts can be related to the metabolic action of catecholamines.
D000818:Animals; D001831:Body Temperature; D001833:Body Temperature Regulation; D004285:Dogs; D006339:Heart Rate; D007031:Hypothalamus / Q000502:physiology; D008297:Male; D009132:Muscles / Q000502:physiology; D009928:Organ Specificity; D005082:Physical Exertion; D012007:Rectum / Q000502:physiology; D012119:Respiration; D013997:Time Factors