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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 mm2; P<0.05) and legs (change in quadriceps area, 607±123 vs. -131±111 mm2; 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 mm2; quadriceps area, 1174±91 mm2) 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.

N Engl J Med. 1996 Jul 4;335(1):1-7.
The Effects of Supraphysiologic Doses of Testosterone on Muscle Size and Strength in Normal Men

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