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Fig. 5. Relationship between postprandial heart rate (beats min–1) and rate of oxygen consumption (ml O2 h–1 kg–0.60) as determined in a male Steller sea lion after a bulk feed of 6 kg (open squares) or 12 kg (filled squares). Data points, consisting of mean fH and O2 values at 5 min intervals, were collected between 30 min and 4 h after feeding. The regression equation for the pooled feeding data is O2=(29.7fH±4.0)+(2136.6±320.5), r2=0.20, P<0.01. The fasting regression line (O2=(71.3fH–4.3)–(1138.5–369.6), r2=0.69, P=<0.01) is shown for comparison.