Nitrogen Balance in Older Individuals in Energy Balance Depends on Timing of Protein Intake

被引：18

作者：

Jordan, Leora Y. ^{[1
]}

Melanson, Edward L. ^{[2
]}

Melby, Christopher L. ^{[3
]}

Hickey, Matthew S. ^{[1
]}

Miller, Benjamin F. ^{[1
]}

机构：

[1] Colorado State Univ, Dept Hlth & Exercise Sci, Ft Collins, CO 80523 USA

[2] Univ Colorado, Denver Sch Med, Div Endocrinol Diabet & Metab, Aurora, CO USA

[3] Colorado State Univ, Dept Food Sci & Human Nutr, Ft Collins, CO 80523 USA

来源：

JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES | 2010年 / 65卷 / 10期

关键词：

Aerobic exercise; Protein intake; Frailty; RECOMMENDED DIETARY ALLOWANCE; PHYSICAL-ACTIVITY; AMINO-ACIDS; WHOLE-BODY; LEUCINE KINETICS; ELDERLY-MEN; MUSCLE; EXERCISE; METABOLISM; INGESTION;

D O I：

10.1093/gerona/glq123

中图分类号：

R592 [老年病学]; C [社会科学总论];

学科分类号：

03 ; 0303 ; 100203 ;

摘要：

To explore whether nitrogen retention can differ on an isonitrogenous diet by changing when protein is consumed, we performed a short-term study in older individuals (64.5 +/- 2.0 years) performing daily exercise while in energy balance. Participants consumed an isonitrogenous-isocaloric diet with the timing of a protein or carbohydrate beverage after exercise (protein after exercise [PRO], carbohydrate after exercise [CHO]) versus earlier in the day. Three-day mean energy balance (PRO: 202 +/- 36 kcal and CHO: 191 +/- 44 kcal; p = .68) did not differ between trials, but 3-day mean nitrogen balance was significantly more positive in the PRO (1.2 +/- 0.32 g N) trial than the CHO trial (0.8 +/- 0.45 g N; p < .05). Older individuals were better able to maintain nitrogen balance by simply changing when a portion of an identical amount of daily protein was consumed.

引用

页码：1068 / 1076

页数：9

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