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Mild overcooling increases energy expenditure during endurance exercise
Author(s) -
Sjödin A.,
Forslund A.,
Webb P.,
Hambræus L.
Publication year - 1996
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/j.1600-0838.1996.tb00065.x
Subject(s) - respiratory quotient , energy expenditure , heart rate , cycle ergometer , endurance training , medicine , vo2 max , work (physics) , core temperature , zoology , physics , blood pressure , biology , thermodynamics
Intensive cooling has been shown to increase energy expenditure (EE) during work as well as to decrease physical performance. Two different levels of moderate cooling (10°C vs 15°C) were studied during light endurance exercise in order to examine the effect of the increased heat loss on EE. Twelve subjects performed a 90‐min low intensity exercise (100 W) on a cycle ergometer, wearing a water‐cooled calorimeter suit for controlled cooling. The lower temperature resulted in a 4.3±3.8% (mean±SD) higher EE, increased total heat loss and lowered skin temperatures. No differences in central core body temperature, heart rate or respiratory quotient (RQ) were recorded. There was a relation between differences in the rate of heat loss and the corresponding increase in EE. Even a small increase in cooling during endurance exercise increased EE which may be a relevant problem in winter sports.