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. 2020 Mar 27;3:49. doi: 10.1038/s41746-020-0257-z

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Measurement of sweat chloride concentration and sweat volume using a wearable sweat chloride sensor and Macroduct device. b Optical images of the sweat sensor and the smartphone app. c Schematic illustration of the wearable potentiometric sensor. d Representative sweat chloride concentration profile for an individual walking at 1.8 m s⁻¹. e Corresponding sweat volume versus time curve. f The time corresponding to the onset of sweating (t_onset) (mean ± SD). g The minimum measurement time (t_m). h The sweat chloride concentration measured by the sensor. C_s is the average value obtained from t_s to the end of the trial. i Sweat volume per unit area collected in a Macroduct over 30 min from the beginning of the trial. **P < 0.01.