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Is sweat rate during steady state exercise related to maximum oxygen uptake?

2006; Elsevier BV; Volume: 31; Issue: 6 Linguagem: Inglês

10.1016/j.jtherbio.2006.05.006

1879-0992

Fabiano T. Amorim, Ana Carolina Vimieiro Gomes, Christiano A. Machado‐Moreira, Flávio de Castro Magalhães, Márcia Rosa, Luciano Sales Prado, Luiz Oswaldo Carneiro Rodrigues,

Cardiovascular and exercise physiology

The purpose of this study was to investigate whether whole-body sweat rate induced by exercise (SRex) at the same oxygen uptake could be correlated with individual maximum oxygen uptake (peak oxygen uptake (V˙O2peak)). A secondary purpose was to examine the relationship between SRex and local sweat rate induced by pilocarpine on the forearm at rest (SRpilo). Nine healthy young males (V˙O2peak 55.2 (12.3) mL min−1 kg−1, mean (SD); 43.3–76.1 mL min−1 kg−1, range), acclimatized to a tropical climate had their sweating stimulated in two situations: (1) exercise-induced whole-body sweat by 120 min of cycling exercise at a constant submaximal oxygen uptake of 1.65 L min−1 or (2) pilocarpine-induced sweat on the right forearm with 0.5% pilocarpine hydrochloride (1.5 mA, 5 min) at rest. The SRex was not correlated with V˙O2peak (r=-0.53, p=0.14). In addition, there was not correlation between SRex (0.38 (0.03) mg cm−2 min−1) and SRpilo (0.36 (0.20) mg cm−2 min−1) (r=0.23, p=0.57). These results suggest that whole-body sweat rate during exercise at the same oxygen uptake in a temperate environment is not related to V˙O2peak. Furthermore, the eccrine sweat gland does not respond similarly for local pilocarpine or exercise stimuli.