Fig. 2. a) Percent of correct responses on the serial addition test. Results are reported at thermoneutral, 0, 1, 2, 3 and 4% dehydration conditions. The actual levels of dehydration are shown in parentheses below the desired target levels (*p < 0.05; ***p < 0.001). Data re-plotted from Gopinathan et al. [14]. b) The mean speed (sec) on the trail-making test at thermoneutral, 0, 1, 2, 3 and 4% dehydration conditions. Actual levels of dehydration reached are shown in parentheses below the desired target levels (***p < 0.001). Data re-plotted from Gopinathan et al. [14].