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Postprandial exercise: prioritization or additivity of the metabolic responses?

Albert F. Bennett^* and James W. Hicks

Department of Ecology and Evolutionary Biology, University of California at Irvine, Irvine, CA 92697, USA

View larger version (13K): [in a new window]   Fig. 1. Hypothetical patterns of rates of oxygen consumption (.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 .O2 is indistinguishable from fasting exercise .O2. (C) Priority to digestion. The postprandial metabolic increment is maintained during exercise, curtailing performance. (D) Additivity. The postprandial metabolic increment is maintained and .O2max is increased. See text for a more detailed explanation.

View larger version (14K): [in a new window]   Fig. 2. Rates of oxygen consumption (.O2) during rest and treadmill exercise in fasting and postprandial lizards. Circles, mean fasting; squares, 24h mean postprandial. Values are means ±1 S.E.M. (N=8).

View larger version (14K): [in a new window]   Fig. 3. Ventilation (.E) and air convection requirement (.E/.O2, where .O2 is the rate of oxygen uptake) during rest and treadmill exercise in fasting and postprandial lizards. Circles, mean fasting; squares, 24h mean postprandial. Values are means ±1 S.E.M. (N=5); lines are least squares linear regressions (.E fasting r2=0.84, P<0.001; .E postprandial r2=0.86, P<0.001; .E/.O2 fasting r2=0.33, P<0.01; .E/.O2 postprandial r2=0.23, P<0.03).