The catabolic effects of prolonged inactivity and acute hypercortisolemia are offset by dietary supplementation

Douglas Paddon-Jones, Melinda Sheffield-Moore, Randall J. Urban, Asle Aarsland, Robert R. Wolfe, Arny A. Ferrando

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

We compared the anabolic stimulus provided by an essential amino acid and carbohydrate (AA/CHO) supplement to a mixed clinical meal during bed rest (BR) and episodic hypercortisolemia (∼24 μg·dl-1). In the experimental (EXP; n = 7) and control (CON; n = 6) groups, femoral arteriovenous blood samples and vastus lateralis biopsy samples were obtained during a primed constant infusion of L-[ring-2H5]phenylalanine and a 14-h infusion of hydrocortisone sodium succinate (60 μg·kg·h -1) before (pre-BR) and after (post-BR) 28 d of BR. Muscle protein kinetics were calculated during the postabsorptive state, for 2.5 h after ingestion of a meal and for 2.5 h after ingestion of an AA/CHO supplement (EXP) or placebo (CON). Postabsorptive net phenylalanine balance values were as follows: EXP, -35.14 ± 2.93, and CON, -32.60 ± 6.65 (pre-BR); and EXP, -32.91 ± 5.67, and CON, -30.43 ± 6.28 nmol phe·ml -1·100 ml leg volume-1 (post-BR). After AA/CHO supplementation, net phenylalanine balance improved to 33.51 ± 8.06 (pre-BR) and 24.15 ± 11.4 nmol phe·ml-1·100 ml leg volume-1 (post-BR), but remained negative after the meal. Cumulative 5.5-h mixed muscle fractional synthetic rate was greater in the EXP group pre-BR (EXP, 0.108 ± 0.01, and CON, 0.073 ± 0.04%·h-1) and post-BR (EXP, 0.111 ± 0.015, and CON, 0.05 ± 0.002%·h-1). Unlike a typical clinical meal, AA/ CHO supplementation stimulated net muscle protein synthesis despite acute hypercortisolemia and prolonged inactivity.

Original languageEnglish (US)
Pages (from-to)1453-1459
Number of pages7
JournalJournal of Clinical Endocrinology and Metabolism
Volume90
Issue number3
DOIs
StatePublished - Mar 1 2005

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Endocrinology
  • Clinical Biochemistry
  • Biochemistry, medical

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