Figure 5.

Case 1 scenarios – Two-dimensional histograms of the rate of required whole-body heat loss, $E_{req}$ (x-axis), and the maximum potential evaporative rate, $E_{max}$ (y-axis,) for three personal profiles (columns) – Middle-aged female; Middle-aged male; Elderly female––while walking in the summertime in Phoenix, Miami, and New York (rows). Black diagonal lines: ${\omega }_{req}$ = 0.5 (thick) and 1 (thin). Purple lines: values of $E_{max\mathrm{\_}sweat}$ for the young/acclimatized and elderly/non-acclimatized (lighter shade) when liquid sweat loss is not replenished. Vertical gray line at $E_{req}$ = 0 indicates thermal equilibrium.