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  • Title: Thermoregulatory and metabolic responses to repeated bouts of prolonged cycle-ergometer exercise in man.
    Author: Kruk B, Szczypaczewska M, Opaszowski B, Kaciuba-Uściłko H, Nazar K.
    Journal: Acta Physiol Pol; 1990; 41(7):22-31. PubMed ID: 2136313.
    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.
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