Age-related anabolic resistance after endurance-type exercise in healthy humans

William J. Durham, Shanon L. Casperson, Edgar Dillon, Michelle A. Keske, Douglas Paddon-Jones, Arthur P. Sanford, Robert C. Hickner, James J. Grady, Melinda Sheffield-Moore

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Age-related skeletal muscle loss is thought to stem from suboptimal nutrition and resistance to anabolic stimuli. Impaired microcirculatory (nutritive) blood flow may contribute to anabolic resistance by reducing delivery of amino acids to skeletal muscle. In this study, we employed contrast-enhanced ultrasound, microdialysis sampling of skeletal muscle interstitium, and stable isotope methodology, to assess hemodynamic and metabolic responses of older individuals to endurance type (walking) exercise during controlled amino acid provision. We hypothesized that older individuals would exhibit reduced microcirculatory blood flow, interstitial amino acid concentrations, and amino acid transport when compared with younger controls. We report for the first time that aging induces anabolic resistance following endurance exercise, manifested as reduced (by ∼40%) efficiency of muscle protein synthesis. Despite lower (by ∼40-45%) microcirculatory flow in the older than in the younger participants, circulating and interstitial amino acid concentrations and phenylalanine transport into skeletal muscle were all equal or higher in older individuals than in the young, comprehensively refuting our hypothesis that amino acid availability limits postexercise anabolism in older individuals. Our data point to alternative mediators of age-related anabolic resistance and importantly suggest correction of these impairments may reduce requirements for, and increase the efficacy of, dietary protein in older individuals.

Original languageEnglish (US)
Pages (from-to)4117-4127
Number of pages11
JournalFASEB Journal
Volume24
Issue number10
DOIs
StatePublished - 2010

Fingerprint

Durability
Amino Acids
Muscle
Skeletal Muscle
Blood
Dietary Proteins
Muscle Proteins
Microdialysis
Hemodynamics
Nutrition
Phenylalanine
Isotopes
Walking
Aging of materials
Ultrasonics
Availability
Sampling

Keywords

  • Amino acids
  • Blood flow
  • Contrast-enhanced ultrasound
  • Microcirculation
  • Microdialysis ethanol

ASJC Scopus subject areas

  • Biochemistry
  • Biotechnology
  • Genetics
  • Molecular Biology
  • Medicine(all)

Cite this

Durham, W. J., Casperson, S. L., Dillon, E., Keske, M. A., Paddon-Jones, D., Sanford, A. P., ... Sheffield-Moore, M. (2010). Age-related anabolic resistance after endurance-type exercise in healthy humans. FASEB Journal, 24(10), 4117-4127. https://doi.org/10.1096/fj.09-150177

Age-related anabolic resistance after endurance-type exercise in healthy humans. / Durham, William J.; Casperson, Shanon L.; Dillon, Edgar; Keske, Michelle A.; Paddon-Jones, Douglas; Sanford, Arthur P.; Hickner, Robert C.; Grady, James J.; Sheffield-Moore, Melinda.

In: FASEB Journal, Vol. 24, No. 10, 2010, p. 4117-4127.

Research output: Contribution to journalArticle

Durham, WJ, Casperson, SL, Dillon, E, Keske, MA, Paddon-Jones, D, Sanford, AP, Hickner, RC, Grady, JJ & Sheffield-Moore, M 2010, 'Age-related anabolic resistance after endurance-type exercise in healthy humans', FASEB Journal, vol. 24, no. 10, pp. 4117-4127. https://doi.org/10.1096/fj.09-150177
Durham, William J. ; Casperson, Shanon L. ; Dillon, Edgar ; Keske, Michelle A. ; Paddon-Jones, Douglas ; Sanford, Arthur P. ; Hickner, Robert C. ; Grady, James J. ; Sheffield-Moore, Melinda. / Age-related anabolic resistance after endurance-type exercise in healthy humans. In: FASEB Journal. 2010 ; Vol. 24, No. 10. pp. 4117-4127.
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