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The effects of exercise and passive heating on the sweat glands ion reabsorption rates

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posted on 20.03.2018 by Nicola Gerrett, Tatsuro Amano, Yoshimitsu Inoue, George Havenith, N. Kondo
The sweat glands maximum ion reabsorption rates were investigated (n = 12, 21.7 ± 3.0 years, 59.4 ± 9.8 kg, 166.9 ± 10.4 cm and 47.1 ± 7.5 mL/kg/min) during two separate endogenous protocols; cycling at 30% (LEX) and 60% VO2max(MEX) and one exogenous trial; passive heating (PH) (43°C water lower leg immersion) in 27°C, 50%RH. Oesophageal temperature (Tes), skin temperature (Tsk), and forearm, chest and lower back sweat rate (SR) and galvanic skin conductance (GSC) were measured. Salivary aldosterone was measured pre-and postheating (n = 3). Using the ∆SR threshold for an increasing ∆GSC to identify maximum sweat ion reabsorption rate revealed higher reabsorption rates during MEX compared to PH (mean of all regions: 0.63 ± 0.28 vs. 0.44 ± 0.3 mg/cm2/min, P < 0.05). It was not possible to identify the ion reabsorption rate during LEX for some participants. Tesand mean Tskwere different between conditions but mean body temperature (Tb) and local Tsk(forearm, chest and back) were similar (P > 0.05). Aldosterone increased more during MEX (72.8 ± 36.6 pg/mL) compared to PH (39.2 ± 17.5 pg/mL) and LEX (1.8 ± 9.7 pg/mL). The back had a higher threshold than the forearm (P < 0.05) but it was similar to the chest (P > 0.05) (mean of all conditions; 0.64 ± 0.33, 0.42 ± 0.25, 0.54 ± 0.3 mg/cm2/min, respectively). Although the differences between conditions may be influenced by thermal or nonthermal mechanism, our results indicate a possibility that the sweat glands maximum ion reabsorption rates may be different between exercise and passive heating without mediating skin regional differences.

Funding

This study was supported by a Grant-in-Aid for Scientific Research (16H04851 and 17H0253) from the Japan Society for the Promotion of Science from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.

History

School

  • Design

Published in

Physiol Rep

Volume

6

Issue

5

Citation

GERRETT, N. ... et al, 2018. The effects of exercise and passive heating on the sweat glands ion reabsorption rates. Physiological Reports, 6 (5), e13619.

Publisher

Wiley Periodicals, Inc. on behalf of The Physiological Society and the American Physiological Society © The Authors

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Acceptance date

25/01/2018

Publication date

2018-02-27

Notes

This is an Open Access Article. It is published by Wiley Periodicals, Inc. on behalf of The Physiological Society and the American Physiological Society under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

ISSN

2051-817X

eISSN

2051-817X

Language

en

Location

United States

Licence

Exports