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Am J Physiol Endocrinol Metab 278: E902-E909, 2000;
0193-1849/00 $5.00
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Vol. 278, Issue 5, E902-E909, May 2000

Protein turnover modifications induced by the protein feeding pattern still persist after the end of the diets

M. A. Arnal1, L. Mosoni1, Y. Boirie2, P. Gachon2, M. Genest2, G. Bayle1, J. Grizard1, M. Arnal1, J. M. Antoine3, B. Beaufrère2, and P. Patureau Mirand1

1 Unité d'Etude du Métabolisme Azoté, Institut National de la Recherche Agronomique et Centre de Recherche en Nutrition Humaine, 63122 Clermont-Ferrand-Theix; 2 Laboratoire de Nutrition Humaine, Université d'Auvergne et Centre de Recherche en Nutrition Humaine, 63009 Clermont-Ferrand; and 3 Société Danone, 92350 Le Plessis-Robinson, France.

This study was undertaken to determine whether the protein feeding pattern could induce chronic adaptation of protein turnover. After a 15-day adaptive period, elderly (68 yr) and young (26 yr) women received, for 14 days, a diet providing 200 KJ · kg fat-free mass (FFM)-1 · day-1, where the daily protein intake (1.7 g protein · kg FFM-1 · day-1) was either spread over 4 meals in the spread pattern or mainly (80%) consumed at noon in the pulse pattern. One day after the end of the dietary treatment, whole body leucine kinetics were measured by use of a continuous [13C]leucine infusion, both in the postabsorptive state and in the same fed state. The pulse pattern was able to induce, in young as in elderly women, a lower postabsorptive leucine oxidation and endogenous leucine flux than the spread pattern and improved the responsiveness of nonoxidative leucine disposal during 4-h oral feeding. Thus the pulse pattern was able to induce chronic regulation of protein metabolism in young as in elderly women.

women; postabsorptive state; postprandial state; aging


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