Protein Pulse Feeding Improves Protein Retention in Elderly Women

Am J Clin Nutr. 1999 Jun;69(6):1202-8. doi: 10.1093/ajcn/69.6.1202.

Abstract

Background: Adequate protein nutrition could be used to limit gradual body protein loss and improve protein anabolism in the elderly.

Objective: We tested the hypothesis that an uneven protein feeding pattern was more efficient in improving protein anabolism than was an even pattern.

Design: After a controlled period, 15 elderly women (mean age: 68 y) were fed for 14 d either a pulse diet (n = 7), providing 80% of the daily protein intake at 1200, or a spread diet (n = 8), in which the same daily protein intake was spread over 4 meals. Both diets provided 1.7 g protein x kg fat-free mass (FFM)(-1) x d(-1). Protein accretion and daily protein turnover were determined by using the nitrogen balance method and the end product method (ammonia and urea) after an oral dose of [15N]glycine.

Results: Nitrogen balance was more positive with the pulse than with the spread diet (54 +/- 7 compared with 27 +/- 6 mg N x kg FFM(-1) x d(-1); P < 0.05). Protein turnover rates were also higher with the pulse than with the spread diet (5.58 +/- 0.22 compared with 4.98 +/- 0.17 g protein x kg FFM(-1) x d(-1); P < 0.05), mainly because of higher protein synthesis in the pulse group (4.48 +/- 0.19 g protein x kg FFM(-1) x d(-1)) than in the spread group (3.75 +/- 0.19 g protein x kg FFM(-1) x d(-1)) (P < 0.05).

Conclusion: A protein pulse-feeding pattern was more efficient than was a protein spread-feeding pattern in improving, after 14 d, whole-body protein retention in elderly women.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Aging / metabolism
  • Basal Metabolism
  • Body Composition
  • Body Weight
  • Calorimetry, Indirect
  • Dietary Proteins / administration & dosage*
  • Dietary Proteins / metabolism*
  • Female
  • Humans
  • Nitrogen / metabolism*

Substances

  • Dietary Proteins
  • Nitrogen