SOURCE-LINKED STUDY SUMMARY
Misuse of androgenic-anabolic steroids and human deltoid muscle fibers: differences between polydrug regimens and single drug administration.
What was studied?
Two studies examined shoulder-muscle fibres in experienced male strength athletes: a double-blind nandrolone study and an observational comparison of self-selected steroid users with nonusers.
What changed?
Nandrolone showed no apparent effect on fibre size or type distribution. In self-selected users, mean fibre size increased 12.6%, with type I increasing 10.8% and type II 14.6%; fibre-type distribution was unchanged. This observational comparison cannot isolate individual drugs' effects.
Who was studied?
The nandrolone study involved 15 volunteers. Separately, 12 men self-administered various steroids and seven nonusers served as controls. Biopsies were taken before and after eight weeks.
Studied exposure
Nandrolone decanoate was administered intramuscularly at 200 mg/week for eight weeks. The self-administered regimens used multiple steroids at supratherapeutic doses; exact amounts were not supplied.
What remains uncertain?
Study limitations were not stated in the abstract. Methodological quality has not been appraised.
Review record & corrections
Summary prepared: . Source scope: abstract. This is an AI-assisted source summary, not an independent clinician sign-off.
No public field-by-field revision history is available for this card yet. The date above is the summary date, not proof that every field was updated then.
Inspect the source · Correction policyResearch findings apply to the population and conditions studied. This educational summary is not a treatment recommendation or a formal assessment of study quality.
Original publication ↗ · DOI: 10.1007/s00421-001-0535-7