Abstract
The purpose of this study was to compare the “NaCl equivalent” values determined by the Wescor's sweat conductivity analyzer (Sweat-Chek) with the sweat Na+ and Cl− concentration values measured by conventional methods. The sweat was induced by 60-min exercise and collected by a closed-pouch collector. The “NaCl equivalent” values determined by the sweat conductivity analyzer (mean: 75 mmol · L−1, range: 38 − 122, n = 72) were significantly (P < 0.05) greater than Na+ concentration values (mean: 7I mmol · L−1, range: 24 − 123, n = 72) measured by flame photometry and Cl− concentration values (mean : 61 mmol· L−1, range: 18 – 100, n = 48) measured by coulometric titration. The differences were most accen-tuated for low concentration values. The 95% confidence-agreement intervals around the mean differences between methods were 11 mmol· L−1 (14%) for both Na+ and Cl−. The SweatChek conductivity analyzer is a portable instrument which approximates the actual Na+ and Cl− concentrations in sweat but with a positive bias probably due to the other unmeasured anions present in sweat.
References
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Boisvert, P., Candas, V. Validity of the Wescor's sweat conductivity analyzer for the assessment of sweat electrolyte concentrations. Europ. J. Appl. Physiol. 69, 176–178 (1994). https://doi.org/10.1007/BF00609413
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DOI: https://doi.org/10.1007/BF00609413