%0 Journal Article
%T The effects of exercise and passive heating on the sweat glands ion reabsorption rates
%A George Havenith
%A Narihiko Kondo
%A Nicola Gerrett
%A Tatsuro Amano
%A Yoshimitsu Inoue
%J Archive of "Physiological Reports".
%D 2018
%R 10.14814/phy2.13619
%X The sweat glands maximum ion reabsorption rates were investigated (n = 12, 21.7 ¡À 3.0 years, 59.4 ¡À 9.8 kg, 166.9 ¡À 10.4 cm and 47.1 ¡À 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¡ãC water lower leg immersion) in 27¡ãC, 50%RH. Oesophageal temperature (T es), skin temperature (T sk), 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 ¡À 0.28 vs. 0.44 ¡À 0.3 mg/cm2/min, P < 0.05). It was not possible to identify the ion reabsorption rate during LEX for some participants. T es and mean T sk were different between conditions but mean body temperature (T b) and local T sk (forearm, chest and back) were similar (P > 0.05). Aldosterone increased more during MEX (72.8 ¡À 36.6 pg/mL) compared to PH (39.2 ¡À 17.5 pg/mL) and LEX (1.8 ¡À 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 ¡À 0.33, 0.42 ¡À 0.25, 0.54 ¡À 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
%K Endogenous vs. exogenous
%K regional differences
%K sweat ion regulation
%K sweating
%U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5828933/