Originally Posted by Ordo Ab Chao
taking this into consideration, would you recommend doing cardio on separate days than lifting or instead doing cardio in an AM session, followed by lifting in a pm session? My thinking here is that PS would only be lowered for 4-6 hours since it would be elevated again during the second session.
Great points. Basically what we know from studies on concurrent training is that the effects appear to be specific to the muscle groups trained. So if you were to do say cardio for the lower body it may not effect the upper body. Probably because negative regulators of protein synthesis are generally upregulated in the trained muscle groups.
Now if we are dealing with legs then yes, seperating the sessions would be ideal. For strength purposes there appears to be little interference when cardio is performed the next day, but if you are doing legs at night, while protein synthesis may be back up, it is possible that the residual fatigue such as glycogen depletion from the morning session could impair performance at night. So if cardio is done on the same day, the reccomendation would be to do lower intensity, less glycogen depleting training.
Its tricky stuff, but I like your thinking!