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Am J Physiol Endocrinol Metab 283: E565-E572, 2002. First published May 7, 2002; doi:10.1152/ajpendo.00132.2002
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Vol. 283, Issue 3, E565-E572, September 2002

A preexercise alpha -lactalbumin-enriched whey protein meal preserves lipid oxidation and decreases adiposity in rats

Jean-Christophe J. Bouthegourd1, Suzanne M. Roseau1, Lina Makarios-Lahham1, Pascale M. Leruyet2, Daniel G. Tomé1, and Patrick C. Even1

1 Unité Mixte de recherche de Physiologie de la Nutrition et du comportement alimentaire, Institut National de la Recherche Agronomique, Institut National Agronomique Paris-Grignon, F75231 Paris; and 2 Recherche et Développement, Lactalis, 53089 Laval Cedex 9, France

The composition of the preexercise food intake is known to affect substrate utilization during exercise and thus can affect long-term changes in body weight and composition. These parameters were measured in male rats exercised 2 h daily over 5 wk, either in the fasting state or 1 h after they ingested a meal enriched with glucose (Glc), whole milk protein (WMP), or alpha -lactalbumin-enriched whey protein (CPalpha L). Compared with fasting, the Glc meal increased glucose oxidation and decreased lipid oxidation during and after exercise. In contrast, the WMP and CPalpha L meals preserved lipid oxidation and increased protein oxidation, the CPalpha L meal increasing protein oxidation more than the WMP meal. At the end of the study, body weight was larger in the WMP-, Glc-, and CPalpha L-fed rats than in the fasted ones. This resulted from an increased fat mass in the WMP and Glc rats and to an increased lean body mass, particularly muscles, in the CPalpha L rats. We conclude that the potential of the CPalpha L meal to preserve lipid oxidation and to rapidly deliver amino acids for use during exercise improved the efficiency of exercise training to decrease adiposity.

indirect calorimetry; glucose; lactate; glycerol; free fatty acids


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