Variations in Regional Sweat Composition in Normal Human Males

This project aimed to quantify the regional distribution of sweat composition over the skin surface and to determine whether sweat constituent concentrations collected from regional sites can estimate whole-body concentrations. Ten males cycled for 90 min in a 20 degrees C (50% relative humidity) environment at 45% peak aerobic power. Sweat was collected from eleven skin regions and the whole body, using a wash-down technique. Strong relationships were evident between the regional and whole-body sweat Na+ and Cl-, such that the thigh and calf exhibited greater correlation coefficients than area-weighted means derived from four and eight skin regions. Therefore, in this particular protocol the whole-body sweat Na+ and Cl- could be predicted from regional sweat collections. Relationships between sweat constituents were evident for sweat Na+ and pH, and sweat K+ and lactate when data were pooled between skin regions and subjects. To our knowledge this is the first investigation to report a positive relationship between sweat K+ and lactate. The exact mechanism responsible for the positive relationship between sweat K+ and lactate is uncertain although it is speculated to occur at the secretory coil.