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Am J Physiol Endocrinol Metab 284: E76-E89, 2003. First published September 11, 2002; doi:10.1152/ajpendo.00234.2002
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Vol. 284, Issue 1, E76-E89, January 2003

Acute response of net muscle protein balance reflects 24-h balance after exercise and amino acid ingestion

Kevin D. Tipton, Elisabet Borsheim, Steven E. Wolf, Arthur P. Sanford, and Robert R. Wolfe

Metabolism Unit, Shriners Hospitals for Children, Galveston 77550; and Department of Surgery, The University of Texas Medical Branch, Galveston, Texas 77555

The purpose of this study was to determine if the acute anabolic muscle response to resistance exercise and essential amino acids (EAA) reflects the response over 24 h. Seven subjects participated in the following two 24-h studies: 1) resting (REST) and 2) rest plus resistance exercise and consumption of EAA (ES). Net balance (NB) across the leg was determined for four amino acids. [13C6]phenylalanine was infused to determine mixed muscle fractional synthetic rate (FSR). Twenty-four-hour FSR was significantly greater for ES than for REST (P = 0.003). Exchange of phenylalanine across the leg was -194 ± 74 (SE) mg for ES and -371 ± 88 mg for REST (P = 0.07) over 24 h and 229 ± 42 mg (ES) and 28 ± 15 mg (REST; P < 0.01) over 3 h corresponding to exercise and EAA consumption for ES. The difference in phenylalanine exchange between REST and ES was not different for measurements over 24 and 3 h. Increases in NB during ES were primarily the result of increases in protein synthesis. Results for other amino acids were similar. The acute anabolic response of muscle to EAA intake and exercise is additive to the response at rest and thus reflects the 24-h response.

muscle protein synthesis; muscle protein breakdown; stable isotopic tracers


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