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European Journal of Applied Physiology

Published in:

01-07-2017 | Original Article

Maximum rate of sweat ions reabsorption during exercise with regional differences, sex, and exercise training

Authors: Tatsuro Amano, Megumi Hirose, Kana Konishi, Nicola Gerrett, Hiroyuki Ueda, Narihiko Kondo, Yoshimitsu Inoue

Published in: European Journal of Applied Physiology | Issue 7/2017

Abstract

Purpose

It is recently reported that determining sweat rate (SR) threshold for increasing galvanic skin conductance (GSC) would represent a maximum rate of sweat ion reabsorption in sweat glands. We evaluate the maximum rate of sweat ion reabsorption over skin regions, sex, and long-term exercise training by using the threshold analysis in the present study.

Methods

Ten males (2 untrained, 4 sprinters, and 4 distance runners) and 12 females (5 untrained, 4 sprinters, and 3 distance runners) conducted graded cycling exercise for 45 min at low, middle, and high exercise intensities (heart rate 100–110, 120–130, and 140–150 beats/min, respectively) for 10, 15, and 20 min, respectively, at 30 °C and 50% relative humidity. Comparisons were made between males and females and among untrained individuals, distance runners, and sprinters on the back and forearm.

Results

SR threshold for increasing GSC on back was significantly higher than that of forearm (P < 0.05) without any sex differences (back 0.70 ± 0.08 and 0.61 ± 0.04, forearm 0.40 ± 0.05 and 0.45 ± 0.06 mg/cm²/min for males and females, respectively). Distance runners and sprinters showed higher SR threshold for increasing GSC than that of untrained subjects on back (P < 0.05) but not on forearm (back 0.45 ± 0.06, 0.83 ± 0.06, and 0.70 ± 0.04, forearm 0.33 ± 0.04, 0.49 ± 0.02, and 0.39 ± 0.07 mg/cm²/min for untrained subjects, distance runners, and sprinters, respectively).

Conclusion

These results suggest that the maximum sweat ion reabsorption rate on the back is higher than that of forearm without sex differences. Furthermore, exercise training in distance runners and sprinters improves the maximum sweat ion reabsorption rate on the back.

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Title: Maximum rate of sweat ions reabsorption during exercise with regional differences, sex, and exercise training
Authors: Tatsuro Amano
Megumi Hirose
Kana Konishi
Nicola Gerrett
Hiroyuki Ueda
Narihiko Kondo
Yoshimitsu Inoue
Publication date: 01-07-2017
Publisher: Springer Berlin Heidelberg
Published in: European Journal of Applied Physiology / Issue 7/2017
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-017-3619-8

At a glance: The STEP trials

Springer Medicine

Maximum rate of sweat ions reabsorption during exercise with regional differences, sex, and exercise training

Abstract

Purpose

Methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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