Fluid balance
sweat loss
HEAT, FLUID LOSS
Despite sweat loss, plasma volume significantly increased by 30 min in both conditions and remained elevated for the duration of the visit. The mean plasma volume increase of 10.2% at min 30 in BET, despite a net fluid loss via sweat, demonstrates the prioritization of plasma volume in the heat. As plasma volume experienced a significant mean increase (PLA: +6.9%, BET: +10.2%), there were significant corresponding dilutions in solute concentrations evident for plasma Na