Energy balance changes the anabolic effect of postexercise feeding in older individuals

We previously showed that consumption of protein immediately after exercise in older adults enhances nitrogen balance when energy balance (EB) is maintained. Because daily EB routinely varies, it is important to know whether benefits of postexercise protein consumption also occur with changing EB. W...

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Published in:The journals of gerontology. Series A, Biological sciences and medical sciences Biological sciences and medical sciences, 2012-11, Vol.67 (11), p.1161-1169
Main Authors: Minor, Brian D, Heusinger, Daniel E, Melanson, Edward L, Hamilton, Karyn L, Miller, Benjamin F
Format: Article
Language:English
Subjects:
Aged
Aging
Aging - metabolism
Aging - physiology
Anabolic Agents
Bioenergetics
Body Mass Index
Body Weight
Diet
Dietary Carbohydrates - metabolism
Dietary Carbohydrates - pharmacology
Dietary Proteins - metabolism
Dietary Proteins - pharmacology
Dietary Supplements
Energy Intake
Energy Metabolism - physiology
Exercise
Exercise - physiology
Female
Geriatric Assessment - methods
Humans
Male
Middle Aged
Nitrogen
Nitrogen - metabolism
Older people
Original
Oxygen Consumption
Prospective Studies
Proteins
Reference Values
Sensitivity and Specificity
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Summary:We previously showed that consumption of protein immediately after exercise in older adults enhances nitrogen balance when energy balance (EB) is maintained. Because daily EB routinely varies, it is important to know whether benefits of postexercise protein consumption also occur with changing EB. Within an experiment, participants consumed an isonitrogenous-isocaloric diet with the timing of a protein (PRO + CHO) or carbohydrate (CHO) beverage immediately after exercise versus earlier in the day. Within hypocaloric and hypercaloric cohorts, 3-day mean nitrogen balance was not different when protein was consumed immediately after exercise, although there was a trend (p = .09) for higher nitrogen balance in the positive EB. However, when data from our three studies were combined, the anabolic effect of postexercise feeding was evident during positive EB but not negative EB. EB is therefore an important consideration in the postexercise anabolic effect of protein feeding.
ISSN:1079-5006
1758-535X
DOI:10.1093/gerona/gls080