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

Physiological Reports
Nicola GerrettNarihiko Kondo

Abstract

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. Tes and mean Tsk were 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...Continue Reading

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Citations

Mar 25, 2019·Temperature : Multidisciplinary Biomedical Journal·Caroline J Smith, George Havenith
Feb 8, 2019·European Journal of Applied Physiology·N GerrettNarihiko Kondo
Mar 4, 2020·European Journal of Applied Physiology·Lindsay B Baker, Anthony S Wolfe
Feb 9, 2021·Temperature : Multidisciplinary Biomedical Journal·Lisa KlousNicola Gerrett
Aug 10, 2021·European Journal of Applied Physiology·N GerrettNarihiko Kondo

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