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Fig. 1. Hypothetical patterns of rates of oxygen consumption (V.O2) during rest and treadmill exercise in fasting and postprandial animals. Circle, fasting rest; square, postprandial rest; solid line, fasting exercise; dashed line, postprandial exercise. (A) Previously documented patterns for fasting and postprandial animals at rest and fasting animals during exercise. (B) Priority to exercise. Postprandial exercise V.O2 is indistinguishable from fasting exercise V.O2. (C) Priority to digestion. The postprandial metabolic increment is maintained during exercise, curtailing performance. (D) Additivity. The postprandial metabolic increment is maintained and V.O2max is increased. See text for a more detailed explanation.