A new study came out in the Journal of Applied Physiology that tested combining cardio and resistance training in the same session. They tried both doing cardio before lifting weights and cardio afterward.
What they found was that combining the two, whether you do it before or after, is terrible for hypertrophy.
Doing the cardio before decreased both IGF-1 and Mechano Growth Factor whereas doing it after increased genes for muscle tissue catabolism.
Weight training is a catabolic activity. It is creating microtrauma throughout the muscles trained. Combining it with another catabolic activity that promotes a lighter body is asking for catabolism.
I've suspected this for a while now. One of my old trainers was adamantly against the common notion of doing cardio after resistance exercise due to decreased glycogen in the muscles and increased utilization of free fatty acids.
Looks like that's not true.
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