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Figure 2


Fig. 2. The effect of exercise performed in June and January in Rana catesbeiana on the rate of oxygen consumed (VO2; ml O2 g–1 h–1) in summer (black circles) and winter (grey squares) and the rate of carbon dioxide produced (VCO2; ml CO2 g–1 h–1) in summer (open circles) and in winter (open squares). Values are means ± s.e.m. Asterisks indicate times at which both VO2 and VCO2 are significantly different from resting frog (REST) values (P>0.05, unpaired t-test by time, N=6–8). Inset shows 240 min average of VO2 in winter and summer post-activity; **significant difference (P<0.05, N=6–8) between identical treatments and gases measured in different seasons.