title: Validity of the Wescor's sweat conductivity analyzer for the assessment of sweat electrolyte concentrations.
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: 71 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 difference were most accentuated 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 Sweat-Chek 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.
authors: Laboratoire de Physiologie et de Psychologie Environenmentales, Centre National de la Recherche Scientifique (CNRS), Strasbourg, France.
authors: P
authors: P
authors: Boisvert
authors: V
authors: V
authors: Candas
mesh_terms: D002712:Chlorides / Q000737:chemistry; D004553:Electric Conductivity; D004573:Electrolytes / Q000737:chemistry*; D015444:Exercise / Q000502:physiology; D006801:Humans; D008297:Male; D010783:Photometry; D012964:Sodium / Q000737:chemistry; D013542:Sweat / Q000737:chemistry*
chemical_list: D002712:Chlorides; D004573:Electrolytes; D012964:Sodium