Sweating responses to a sustained static exercise is dependent on thermal load in humans

N. Kondo, N. Horikawa, K. Aoki, M. Shibasaki, Y. Inoue, T. Nishiyasu, C. G. Crandall

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

The purpose of this project was to test the hypothesis that internal temperature modulates the sweating response to sustained handgrip exercise. Ten healthy male subjects immersed their legs in 43 LC water for 30-40 min at an ambient temperatures of 30°C and a relative humidity of 50%. Sweating responses to 50% maximal voluntary contraction isometric handgrip exercise (IH) were measured following the onset of sweating (i.e. following slight increases in internal temperature), and after more pronounced increases in internal temperature. Oesophageal temperature (Tes) was significantly lower during the first bout of exercise (37.54 ± 0.07°C) relative to the second bout (37.84 ± 0.12°C; P < 0.05). However, the increase in mean sweating rate (SR) from both the chest and forearm (non-glabrous skin) was significantly greater during the first IH bout relative to the second bout (P < 0.05). Increases in mean arterial blood pressure and palm SR (glabrous skin) did not differ significantly between exercise bouts, while heart rate and rating of perceived effort were significantly greater during the second bout of IH. As Tes and mean skin temperature did not change)during either bout of exercise, the changes in SR from non-glabrous skin between the bouts of IH were likely because of non-thermal factors. These data suggest that sweating responses from non-glabrous skin during IH vary depending on the magnitude of thermal input as indicated by differing internal temperatures between bouts of IH. Moreover, these data suggest that the contribution of non-thermal factors in governing sweating from non-glabrous skin may be greatest when internal temperature is moderate (37.54°C), but has less of an effect after greater elevations in internal temperature (i.e. 37.84°C).

Original languageEnglish (US)
Pages (from-to)289-295
Number of pages7
JournalActa Physiologica Scandinavica
Volume175
Issue number4
DOIs
StatePublished - Nov 20 2002

Keywords

  • Cutaneous vascular response
  • Isometric handgrip exercise
  • Non-thermal factors
  • Thermal factors

ASJC Scopus subject areas

  • Physiology

Fingerprint Dive into the research topics of 'Sweating responses to a sustained static exercise is dependent on thermal load in humans'. Together they form a unique fingerprint.

  • Cite this