Cited by 1,659Hormonal and reproductive studiesDoping in SportsSports Performance and Training

The effects of supraphysiologic doses of testosterone on muscle size and strength in normal men

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Bhasin, Shalender, Storer, Thomas W., Berman, Nancy, Callegari, Carlos, Clevenger, Brenda, Phillips, Jeffrey, Bunnell, Thomas J., Tricker, Ray +2 more·1996·New England Journal of Medicine

Abstract

BACKGROUND: Athletes often take androgenic steroids in an attempt to increase their strength. The efficacy of these substances for this purpose is unsubstantiated, however. METHODS: We randomly assigned 43 normal men to one of four groups: placebo with no exercise; testosterone with no exercise; placebo plus exercise; and testosterone plus exercise. The men received injections of 600 mg of testosterone enanthate or placebo weekly for 10 weeks. The men in the exercise groups performed standardized weight-lifting exercises three times weekly. Before and after the treatment period, fat-free mass was determined by underwater weighing, muscle size was measured by magnetic resonance imaging, and the strength of the arms and legs was assessed by bench-press and squatting exercises, respectively. RESULTS: Among the men in the no-exercise groups, those given testosterone had greater increases than those given placebo in muscle size in their arms (mean [+/-SE] change in triceps area, 424 +/- 104 vs. -81 +/- 109 square millimeters; P < 0.05) and legs (change in quadriceps area, 607 +/- 123 vs. -131 +/- 111 square millimeters; P < 0.05) and greater increases in strength in the bench-press (9 +/- 4 vs. -1 +/- 1 kg, P < 0.05) and squatting exercises (16 +/- 4 vs. 3 +/- 1 kg, P < 0.05). The men assigned to testosterone and exercise had greater increases in fat-free mass (6.1 +/- 0.6 kg) and muscle size (triceps area, 501 +/- 104 square millimeters; quadriceps area, 1174 +/- 91 square millimeters) than those assigned to either no-exercise group, and greater increases in muscle strength (bench-press strength, 22 +/- 2 kg; squatting-exercise capacity, 38 +/- 4 kg) than either no-exercise group. Neither mood nor behavior was altered in any group. CONCLUSIONS: Supraphysiologic doses of testosterone, especially when combined with strength training, increase fat-free mass and muscle size and strength in normal men.

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Crossref · 10.1056/nejm199607043350101

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Authors
Bhasin, S., Storer, T. W., Berman, N., Callegari, C., Clevenger, B., Phillips, J., Bunnell, T. J., Tricker, R., Shirazi, A., & Casaburi, R.
Affiliations
  • Charles R. Drew University of Medicine and Science (US)
  • El Camino College (US)
  • Harbor–UCLA Medical Center (US)
  • Oregon State University (US)
Venue
New England Journal of Medicine
Published
1996-07-04
Volume
335
Issue
1
Pages
1-7
ISSN
  • 0028-4793 (ISSN-L)
  • 1533-4406
OpenAlex
W2326289669
Cited by
1,659
References
35
Citations by year
2026: 41 · 2025: 52 · 2024: 43 · 2023: 56 · 2022: 81 · 2021: 67 · 2020: 59 · 2019: 54 · 2018: 48 · 2017: 50 · 2016: 54 · 2015: 59 · 2014: 58 · 2013: 53 · 2012: 56
FWCI
44.96
Type
journal article
Language
en
Open access
Locations
  • New England Journal of Medicine (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (7r01dk045211-04)
  • U.S. Public Health Service (MO-00543)
  • National Institute of Diabetes and Digestive and Kidney Diseases (1RO1-DK-45211)
  • National Center for Research Resources (P20 RR 11145-01, P20RR011145)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal and reproductive studies
  • Social Sciences › Sociology and Political Science › Doping in Sports
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
Keywords
testosterone, testosterone enanthate, anabolic steroids, muscle size, muscle strength, fat-free mass, resistance training, weightlifting, athletes, muscle hypertrophy
MeSH terms
Adult, Affect, Anger, Behavior, Biomechanical Phenomena, Body Weight, Double-Blind Method, Gonadotropins, Pituitary, Humans, Injections, Intramuscular, Lipids, Male, Sex Hormone-Binding Globulin, Testosterone, Weight Lifting, Muscle, Skeletal

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