FIGURE 3.

Body fluid compartment changes occur through sweat loss. (a) Total body water was calculated as 29.4 L using the Watson equation. Assuming that 33% of the total body water is located in the ECF, that gives a distribution of ICF 19.6 L and ECF 9.8 L before Bikram Yoga. (b) After Bikram yoga, the participants lost 1.5 L of sweat, containing 160 mOsmol/kg of solutes, and drank approximately 0.4 L of water. This produced an increase in total body osmolality by 3 mOsm/kg and a net shift of 0.2 L from the ICF to the ECF. The dashed box represents the ECF volume lost as sweat. The net result volume contraction of the ECF by 9.7%