title: Energy balance changes the anabolic effect of postexercise feeding in older individuals.
abstract: 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.
authors.affiliation: Department of Health and Exercise Science, Colorado State University, Fort Collins, CO 80523-1582, USA.
authors.forename: Brian D
authors.initials: BD
authors.lastname: Minor
authors.forename: Daniel E
authors.initials: DE
authors.lastname: Heusinger
authors.forename: Edward L
authors.initials: EL
authors.lastname: Melanson
authors.forename: Karyn L
authors.initials: KL
authors.lastname: Hamilton
authors.forename: Benjamin F
authors.initials: BF
authors.lastname: Miller
mesh_terms: D000368:Aged; D000375:Aging / Q000378:metabolism* / Q000502:physiology; D045930:Anabolic Agents; D015992:Body Mass Index; D001835:Body Weight; D004040:Dietary Carbohydrates / Q000378:metabolism / Q000494:pharmacology; D004044:Dietary Proteins / Q000378:metabolism / Q000494:pharmacology*; D019587:Dietary Supplements; D002149:Energy Intake; D004734:Energy Metabolism / Q000502:physiology*; D015444:Exercise / Q000502:physiology; D005260:Female; D015577:Geriatric Assessment / Q000379:methods; D006801:Humans; D008297:Male; D008875:Middle Aged; D009584:Nitrogen / Q000378:metabolism*; D010101:Oxygen Consumption; D011446:Prospective Studies; D012016:Reference Values; D012680:Sensitivity and Specificity
chemical_list: D045930:Anabolic Agents; D004040:Dietary Carbohydrates; D004044:Dietary Proteins; D009584:Nitrogen