Carbohydrates release insulin, insulin enhances nutrient partitioning, specifically protein. Insulin is also the most anabolic hormone in the human body. Carbohydrates taken post workout have been reported to reduce markers of protein degradation and thus can enhance recovery via that mechanism. This may be related to the reduction in cortisol levels since you are attenuating the muscle damage, and thus recovering from the stress more efficiently. What do you mean when you say testosterone levels were mentioned in ratio?