Effect of Acute Alcohol Ingestion on Resistance Exercise-Induced mTORC1 Signaling in Human Muscle

J Strength Cond Res. 2017 Jan;31(1):54-61. doi: 10.1519/JSC.0000000000001468.

Abstract

Duplanty, AA, Budnar, RG, Luk, HY, Levitt, DE, Hill, DW, McFarlin, BK, Huggett, DB, and Vingren, JL. Effect of acute alcohol ingestion on resistance exercise-induced mTORC1 signaling in human muscle. J Strength Cond Res 31(1): 54-61, 2017-The purpose of this project was to further elucidate the effects postexercise alcohol ingestion. This project had many novel aspects including using a resistance exercise (RE) only exercise design and the inclusion of women. Ten resistance-trained males and 9 resistance-trained females completed 2 identical acute heavy RE trials (6 sets of Smith machine squats) followed by ingestion of either alcohol or placebo. All participants completed both conditions. Before exercise (PRE) and 3 (+3 hours) and 5 (+5 hours) hours postexercise, muscle tissue samples were obtained from the vastus lateralis by biopsies. Muscle samples were analyzed for phosphorylated mTOR, S6K1, and 4E-BP1. For men, there was a significant interaction effect for mTOR and S6K1 phosphorylation. At +3 hours, mTOR and S6K1 phosphorylation was higher for placebo than for alcohol. For women, there was a significant main effect for time. mTOR phosphorylation was higher at +3 hours than at PRE and at +5 hours. There were no significant effects found for 4E-BP1 phosphorylation in men or women. The major findings of this study was that although RE elicited similar mTORC1 signaling both in men and in women, alcohol ingestion seemed to only attenuate RE-induced phosphorylation of the mTORC1 signaling pathway in men. This study provides evidence that alcohol should not be ingested after RE as this ingestion could potentially hamper the desired muscular adaptations to RE by reducing anabolic signaling, at least in men.

MeSH terms

  • Adaptor Proteins, Signal Transducing / drug effects
  • Adaptor Proteins, Signal Transducing / metabolism
  • Adult
  • Alcoholic Beverages / adverse effects*
  • Athletes*
  • Body Weights and Measures
  • Cell Cycle Proteins
  • Female
  • Humans
  • Male
  • Mechanistic Target of Rapamycin Complex 1
  • Multiprotein Complexes / drug effects*
  • Multiprotein Complexes / metabolism
  • Muscle, Skeletal / drug effects*
  • Muscle, Skeletal / physiology
  • Phosphoproteins / drug effects
  • Phosphoproteins / metabolism
  • Phosphorylation
  • Resistance Training / methods*
  • Ribosomal Protein S6 Kinases, 70-kDa / drug effects
  • Ribosomal Protein S6 Kinases, 70-kDa / metabolism
  • Signal Transduction / drug effects
  • TOR Serine-Threonine Kinases / drug effects*
  • TOR Serine-Threonine Kinases / metabolism
  • Young Adult

Substances

  • Adaptor Proteins, Signal Transducing
  • Cell Cycle Proteins
  • EIF4EBP1 protein, human
  • Multiprotein Complexes
  • Phosphoproteins
  • Mechanistic Target of Rapamycin Complex 1
  • Ribosomal Protein S6 Kinases, 70-kDa
  • TOR Serine-Threonine Kinases
  • ribosomal protein S6 kinase, 70kD, polypeptide 1