Dose effect of caffeine on testosterone and cortisol responses to resistance exercise.
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Link to full study
http://www.ncbi.nlm.nih.gov/pubmed/18458357
Conclusion of this study
Caffeine has some potential to benefit training outcomes via the anabolic effects of the increase in testosterone concentration, but this benefit might be counteracted by the opposing catabolic effects of the increase in cortisol and resultant decline in the testosterone:cortisol ratio.
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