Boisvert P, Candas V
Laboratoire de Physiologie et de Psychologie Environenmentales, Centre National de la Recherche Scientifique (CNRS), Strasbourg, France.
Eur J Appl Physiol Occup Physiol. 1994;69(2):176-8. doi: 10.1007/BF00609413.
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.
本研究的目的是比较韦斯可（Wescor）汗液电导率分析仪（Sweat-Chek）测定的“氯化钠当量”值与传统方法测量的汗液中Na⁺和Cl⁻浓度值。通过60分钟运动诱导出汗，并使用封闭袋式收集器收集汗液。汗液电导率分析仪测定的“氯化钠当量”值（均值：75 mmol·L⁻¹，范围：38 - 122，n = 72）显著（P < 0.05）高于火焰光度法测量的Na⁺浓度值（均值：71 mmol·L⁻¹，范围：24 - 123，n = 72）以及库仑滴定法测量的Cl⁻浓度值（均值：61 mmol·L⁻¹，范围：18 - 100，n = 48）。低浓度值时差异最为明显。两种方法均值差异周围的95%一致性区间对于Na⁺和Cl⁻均为11 mmol·L⁻¹（14%）。Sweat-Chek电导率分析仪是一种便携式仪器，它接近汗液中实际的Na⁺和Cl⁻浓度，但可能由于汗液中存在其他未测量的阴离子而存在正偏差。
