Postprandial thermogenesis at rest and during exercise in elderly men ingesting two levels of protein.

Details

Serval ID
serval:BIB_C27B258F2396
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Postprandial thermogenesis at rest and during exercise in elderly men ingesting two levels of protein.
Journal
Journal of the American College of Nutrition
Author(s)
Schutz Y., Bray G., Margen S.
ISSN
0731-5724 (Print)
ISSN-L
0731-5724
Publication state
Published
Issued date
1987
Volume
6
Number
6
Pages
497-506
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
Seven elderly male subjects (69 +/- 3 yr, 67.8 +/- 9.2 kg, 24.5 +/- 3.6% body fat) lived for 12 consecutive weeks in a metabolic unit and maintained their weight with two different diets fed for 6 weeks each: Diet A, consisted of their habitual protein intake as determined on the outside by a dietary record (mean +/- SD, 1.12 +/- 0.22 g/kg d). Diet B was an isocaloric diet with reduced protein intake (70 mgN/kg d, i.e., 0.44 g protein/kg d) at the level of physiological protein requirement [7]. After 3 weeks on each diet, the thermogenic response to single meals A and B containing 38% of weight maintenance energy for each subject (731-994 kcal) was studied by indirect calorimetry under two situations: (1) at rest over a 4 hr period and (2) during graded exercise on a bicycle ergometer at four stepwise workloads (0,80, 200, and 300 kg/min). A postabsorptive control exercise was also performed in order to assess the net effect of the meal during exercise. Eating alone increased the energy expenditure by +0.18 +/- 0.07 kcal/min with meal A and +0.13 +/- 0.06 kcal/min with meal B. There was a positive correlation (r = 0.84, p less than 0.01) between the % energy derived from protein and the thermogenic response expressed as % of the energy content of test meal. Exercise failed to influence the thermogenic response to meals since the overall net increase in energy expenditure induced by the meals while exercising was not different from that obtained at rest: +0.22 +/- 0.17 kcal/min and +0.15 +/- 0.13 kcal/min with meal A and meal B, respectively. This study failed to show any interaction between exercise and postprandial thermogenesis in elderly individuals.
Keywords
Aged, Carbon Dioxide/metabolism, Dietary Proteins/metabolism, Eating, Energy Intake, Energy Metabolism, Humans, Male, Oxygen Consumption, Physical Exertion, Rest
Pubmed
Web of science
Create date
21/01/2008 13:08
Last modification date
20/08/2019 15:37
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