I'm a type 1 diabetic and was doing some research. This is a study proving that sex hormones (eg., testosterone, progesterone, etc) at higher than normal (physiological) levels causes a decrease in insulin sensetivity. Since skeletal muslce attenuates most of the insulin in our bodies, this means skeletal muscle absorbs less glucose and aa's when on AAS. Check out the link guys.
http://www.clinsci.org/cs/102/0151/1020151.pdf
