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. Author manuscript; available in PMC: 2015 Jun 1.
Published in final edited form as: Drug Alcohol Depend. 2014 Mar 19;139:86–92. doi: 10.1016/j.drugalcdep.2014.03.008

Figure 2.

Figure 2

The On-cycle anabolic-androgenic steroid (AAS) users who were on-cycle had significantly higher levels of β-endorphin than off-cycle AAS users or heavy exercising controls. Wald χ2 =9.82, p < .001 for AAS group on β-endorphin. Error bars are standard error of the mean. *p < .05. **p < .01.