Alen, Reinila, & Reijo (1985) observed that serum testosterone level tended to increase throughout a 26 week cycle of various AAS until abruptly dropping below normal levels during cessation. When athletes discontinue the use of AAS they experience a refractory period where they do not produce physiological amounts of endogenous testosterone (Di Pasquale, 1992a). Anabolic-androgenic steroid can reduce endogenous testosterone, gonadotrophic hormones and sex hormone-binding globulin (Yesalis, Wright, & Bahrke, 1989). Weight trained athletes have been shown to have low serum testosterone concentrations immediately after cessation of an AAS cycle but return to normal within weeks (Alen, Reinila, & Reijo, 1985).
Anabolic Steroids for Sport