title: Thermoregulatory and metabolic responses to repeated bouts of prolonged cycle-ergometer exercise in man.
abstract: Changes in body temperature, oxygen uptake (VO2), heart rate (HR), sweating rate and plasma osmolarity were examined in 10 human subjects, performing four successive 30 min exercise-bouts of the same intensity (50% VO2 max) separated by 30 min rest periods. In spite of the rest intervals and replacement of body fluid loss there was a progressive increase in VO2. HR, rectal (Tre) and mean body (Tb) temperatures in consecutive exercise bouts. The thermoregulatory efficiency showed an increasing tendency, and a delay in the sweating response at the beginning of each exercise was shortened. It is concluded that a drift in metabolic and temperature responses to exercise, reported throughout a long-term continuous work, occurs also in the euhydrated subjects performing a prolonged intermittent exercise. It is not caused by an impaired thermoregulation during exercise but rather by insufficient restitution of metabolic processes during rest intervals.
authors: Department of Applied Physiology, Polish Academy of Sciences, Warsaw.
authors: B
authors: B
authors: Kruk
authors: M
authors: M
authors: Szczypaczewska
authors: B
authors: B
authors: Opaszowski
authors: H
authors: H
authors: Kaciuba-Uściłko
authors: K
authors: K
authors: Nazar
mesh_terms: D000328:Adult; D001831:Body Temperature / Q000502:physiology; D001833:Body Temperature Regulation / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D009994:Osmolar Concentration; D010101:Oxygen Consumption / Q000502:physiology; D012881:Skin Temperature / Q000502:physiology; D013546:Sweating / Q000502:physiology; D013997:Time Factors; D014692:Ventilation-Perfusion Ratio