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[For a full review of the epidemiology of AAS use see Yesalis, Kennedy, Kopstein, & Bahrke (1993). list of steroids Where can i buy steroids. ] An abundance of anecdotal "personal stories" appear in the popular bodybuilding press (e. g. , Lefavi, 1998) and case studies are also frequent in the scientific literature (e. list of steroids Steroid-encyclopedia. g. , Corrigan, 1996; Pope & Katz, 1990; Schulte, Hall, & Boyer, 1993; Wilson-Fearon & Parrott, 1999). These data represent naturalistic evidence of this relationship. list of steroids Muscle. Evidence from such reports, while rich in individual detail, contributes little to an understanding of the relationship between AAS use and aggression in the larger population. They are biased in that any number of characteristics might differentiate such individuals from the general population besides their use of AAS, again highlighting the difficulty in attempting to speculate about "normal" processes, pharmacological or psychological, in "abnormal" cases. Nonetheless, such cases constitute the majority of the evidence to which the populace is exposed. More rigorous studies involve the observation of the concurrent correlation between variables within large groups (empirical research) or comparisons between existing groups on concurrent measures (cross-sectional research). Changes in relationships may be evaluated over time, either within or between existing groups (longitudinal or prospective studies). Lastly, treatments (i. e. , the administration of AAS/placebo) may be applied to either pre-existing groups (quasi-experimental designs) or to groups of randomly assigned subjects (true experimental designs) who are then evaluated over time. Empirical and Case Studies. A substantial amount of empirical research supports the AAS/aggression relationship. For instance, AAS users report higher levels of anger-arousal and hostile outlook than a group that never used AAS (Lefavi, Reeve, & Newland, 1990). Interestingly, data collected from former AAS users was not reported, so it is uncertain if they differed reliably from either group. AAS users exhibit increased instances of mood disorder (Pope & Katz, 1994), higher scores on aggression scales on personality measures (Galligani, Renck, & Hansen, 1996; Yates, Perry, & Murray, 1992) and measures of mood (Bond, Choi, & Pope, 1995).
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