Fig. 4. Metabolic heat production as a function of air temperature (8 h exposure). Minimum and maximum values are those measured 30 min into the periods in which the reported minimum and maximum body temperatures occurred. Average values are body temperatures averaged over the entire 8 h period. Also shown is the estimated metabolic heat production as calculated from equation 1, setting C=0.14 W°C^-1 and T_B=37°C. Values are means ± S.E.M. (N=9).