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Acute testosterone administration does not affect muscle anabolism.

David D Church1, Stefan M Pasiakos2, Robert R Wolfe1

  • 11Department of Geriatrics, Donald W. Reynolds Institute on Aging, Center for Translational Research in Aging & Longevity, University of Arkansas for Medical Sciences, Little Rock, AR 72205 USA.

Nutrition & Metabolism
|August 24, 2019
PubMed
Summary
This summary is machine-generated.

Testosterone (T) does not immediately impact muscle protein synthesis or breakdown rates. Acute T exposure in healthy men showed no significant changes in muscle protein kinetics within 5 hours.

Keywords:
Amino acids kineticsProtein breakdownProtein metabolismProtein synthesisStable isotope tracersTestosterone

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Area of Science:

  • Endocrinology
  • Sports Medicine
  • Muscle Physiology

Background:

  • Previous research indicates testosterone enhances muscle protein balance 5 days post-administration.
  • The immediate effects of testosterone on muscle protein kinetics are not well understood.

Purpose of the Study:

  • To investigate the acute effects of testosterone exposure on leg muscle protein kinetics.
  • To examine the impact of testosterone on amino acid transport in skeletal muscle.

Main Methods:

  • Utilized the arteriovenous balance model in four healthy men over a 5-hour period.
  • Measured mixed-muscle protein fractional synthesis (FSR) and breakdown (FBR) rates.
  • Assessed selected amino acid (AA) transport kinetics during testosterone infusion.

Main Results:

  • Testosterone administration did not alter muscle protein FSR, FBR, or net protein balance.
  • Arterial and venous free testosterone levels significantly increased during infusion.
  • Testosterone infusion minimally affected amino acid transport, with minor changes in leucine kinetics.

Conclusions:

  • Acute exposure to testosterone does not confer immediate effects on skeletal muscle amino acid kinetics or anabolism.
  • The earliest discernible effects of testosterone on muscle protein kinetics require further investigation.