European Journal of Applied Physiology

, Volume 116, Issue 2, pp 281–290 | Cite as

Determination of the maximum rate of eccrine sweat glands’ ion reabsorption using the galvanic skin conductance to local sweat rate relationship

  • Tatsuro Amano
  • Nicola Gerrett
  • Yoshimitsu Inoue
  • Takeshi Nishiyasu
  • George Havenith
  • Narihiko Kondo
Original Article



The purpose of the present study was to develop and describe a simple method to evaluate the rate of ion reabsorption of eccrine sweat glands in human using the measurement of galvanic skin conductance (GSC) and local sweating rate (SR). This purpose was investigated by comparing the SR threshold for increasing GSC with following two criteria of sweat ion reabsorption in earlier studies such as (1) the SR threshold for increasing sweat ion was at approximately 0.2–0.5 mg/cm2/min and (2) exercise heat acclimation improved the sweat ion reabsorption ability and would increase the criteria 1.


Seven healthy non-heat-acclimated male subjects received passive heat treatment both before and after 7 days of cycling in hot conditions (50 % maximum oxygen uptake, 60 min/day, ambient temperature 32 °C, and 50 % relative humidity).


Subjects became partially heat-acclimated, as evidenced by the decreased end-exercise heart rate (p < 0.01), rate of perceived exhaustion (p < 0.01), and oesophageal temperature (p = 0.07), without alterations in whole-body sweat loss, from the first to the last day of training. As hypothesized, we confirmed that the SR threshold for increasing GSC was near the predicted SR during passive heating before exercise heat acclimation, and increased significantly after training (0.19 ± 0.09–0.32 ± 0.10 mg/cm2/min, p < 0.05).


The reproducibility of sweat ion reabsorption by the eccrine glands in the present study suggests that the relationship between GSC and SR can serve as a new index for assessing the maximum rate of sweat ion reabsorption of eccrine sweat glands in humans.


Thermoregulation Electrodermal response Exercise training Ventilated capsule method Index of sweated ion reabsorption 



Analysis of variance


Body weight reduction


Galvanic skin conductance


Heart rate


Mean arterial blood pressure


Sodium chloride


Rate of perceived exhaustion


Sweat rate


Mean body temperature


Oesophageal temperature


Mean skin temperature

\({{\dot{\text{V}}}\text{O}}_{{ 2 {\text{max}}}}\)

Maximum oxygen uptake



We would like to thank our volunteer subjects for participating in this study. NK is supported by Grants-in-Aid for Scientific Research (No. 23300231) from the Japan Society for the Promotion of Science (JSPS) from the Ministry of Education, Culture, Sports, Science and Technology of Japan. TA is supported by a JSPS fellowship (No. 244185) from the Ministry of Education, Culture, Sports, Science and Technology of Japan. TN is supported by a Grant-in-Aid for Scientific Research (no. 25242061) from the Japan Society for the Promotion of Science (JSPS) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

Compliance with ethical standards

Conflict of interest



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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Tatsuro Amano
    • 1
  • Nicola Gerrett
    • 2
    • 3
  • Yoshimitsu Inoue
    • 4
  • Takeshi Nishiyasu
    • 5
  • George Havenith
    • 2
  • Narihiko Kondo
    • 1
  1. 1.Laboratory for Applied Human Physiology, Graduate School of Human Development and EnvironmentKobe UniversityKobeJapan
  2. 2.Environmental Ergonomics Research CentreLoughborough UniversityLoughboroughUK
  3. 3.Institute of Sport and Exercise ScienceUniversity of WorcesterWorcesterUK
  4. 4.Laboratory for Human Performance ResearchOsaka International UniversityOsakaJapan
  5. 5.Institute of Health and Sports ScienceUniversity of TsukubaTsukubaJapan

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