Anabolic steroids increase exercise tolerance.
Level 5 - mechanism / opinion, no new human data
Animal experimental study
PubMed 11350779 · doi:10.1152/ajpendo.2001.280.6.E973
What was done
Adult male rats were randomized into a control group or an anabolic-androgenic steroid group receiving nandrolone decanoate one week before a single exhaustive weight-lifting bout. Researchers assessed post-exercise recovery across 14 days by measuring serum creatine kinase (CK) at 30 and 60 minutes, [3H]thymidine uptake for mitotic activity, and [14C]leucine uptake for amino acid utilization and myosin synthesis. A separate group was evaluated for in situ isometric mechanical properties and fatigue resistance of the plantaris muscle.
What was found
Steroid-treated rats lifted a higher total amount of weight and had lower serum CK levels after exercise compared with controls. [3H]thymidine uptake peaked 2 days post-exercise and was 90% higher in control rats than in steroid-treated rats. [14C]leucine uptake was approximately 80% higher at rest and recovered 33% faster post-exercise in steroid-treated rats. In situ plantaris testing demonstrated significantly higher fatigue resistance in the steroid group compared with controls, with no other significant mechanical differences.
Why it matters
This study provides physiological and biochemical evidence in rodents that anabolic steroids can reduce acute muscle damage markers, improve fatigue resistance, and accelerate metabolic recovery following exhaustive resistance exercise.
Limits
The study was conducted entirely in male rats, limiting direct translation to humans. The abstract does not provide exact sample sizes, dosage amounts, baseline animal characteristics, or absolute values for weight lifted and creatine kinase concentrations.
Cited by
- supports Anabolic steroid users recover from resistance training stress and muscle damage more quickly than non-users.