Maximal oxygen uptake, sweating and tolerance to exercise in the heat | Zendy

J. E. Greenleaf | Zendy; B. L. Castle | Zendy; Wilfried Ruff | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

Maximal oxygen uptake, sweating and tolerance to exercise in the heat

Author(s) -

J. E. Greenleaf,

B. L. Castle,

Wilfried Ruff

Publication year - 1972

Publication title -

international journal of biometeorology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.763

H-Index - 92

eISSN - 1432-1254

pISSN - 0020-7128

DOI - 10.1007/bf01553622

Subject(s) - vo2 max , oxygen , heart rate , sweat , heat load , thermoregulation , physics , skin temperature , chemistry , zoology , psychology , mathematics , medicine , thermodynamics , biomedical engineering , biology , blood pressure , quantum mechanics

The purpose of this experiment was to determine if tolerance to exercise in the heat is related to maximal oxygen uptake (max ${\dot V}$ 02) and sweating. Seven men with max ${\dot V}$ 02 between 42 and 66 ml/(min·kg) underwent one 2-hr exposure at 24°C Tq while working on a bicycle ergometer at $\overline {\text{X}}$ rel ${\dot V}$ 02 of 28% ( $\overline {\text{X}}$ ${\dot V}$ 02 = 1.23 1/min). In the hot exposures the high capacity subjects had maximal sweat rates of 800 to 1,000 g/(hr·m2) while the lower capacity men sweated 300 to 400 g/(hr·m2). These differences in sweating were not related to neuromuscular stimuli, ${\dot V}$ 02 (metabolic rate), Tre, ?Tre, $\overline {\text{T}}$ s, ? $\overline {\text{T}}$ s or tolerance time. Tolerance to exercise in the heat was not related to maximal ${\dot V}$ 02 capacity when the subjects worked at the same relative load in spite of large differences in sweating. These results question the importance of the rate of sweating for predicting work performance in hot environments.