On the contrary i have read studies where PWO cardio is extremely benificial for acheiving a higher % of "fat burnage" due to the fact that after a high intensity anaerobic work out your depleted of glycogen.
RIGHT, BUT YOU HAVE JUST SENT AN ANABOLISM MESSAGE, AND THE CNS KNOWS THAT. DOING CARDIO ONLY CATAPULTS ONE INTO CATABOLISM. MORNING CARDIO IS DIFFERENT, AS YOU ARE DEPLETED, YES, BUT YOU ARE ALSO RESTED, NOT JUST HAVING DONE WEIGHTS. BELIEVE ME, I KNOW OF WHERE I SPEAK.
therefore you have only fat and protein to utilize as fuel which means if you can keep your HR moderately low then you will spare protein and get sexy post haste.