The testosterone / cortisol ratio dictates the training effect. (strengthsensei.com)
Influence of dietary carbohydrate intake on the free testosterone: cortisol ratio responses to short - term intensive exercise training. (completehumanperformance.com)
Marsit, J.L, et al., Effects of ascorbic acid on serum cortisol and the Testosterone: Cortisol ratio in junior elite weightlifters, Journal of Strength And Conditioning Research, 1998, 12 (3), 179 - 184 (hardgainermusclebuilding.com)