I guess I’m a bit torn in terms of definitions here. When I think “cardio” I think Type 1 muscle fibers, aerobic exercise. Guerilla cardio and even a lot of the HIIT routines I see seem like anaerobic sprinting (yes, captain obvious).
Anyway, discounting the metabolic effects of these workouts (which wind up burning cals and fat throughout the day), in terms of straight up mass building (rather than preservation) it seems that they don’t deplete your muscle glycogen to the point where your muscles would be as responsive to an insulin surge (using, of course, Surge) since the energy systems tapped are ATP-CP and lactic acid.
Someone correct me if I’m wrong here, because I do my sprints for general energy work and for rugby/b-ball, but i wouldn’t consider them “off day” activities, whereas a bout of low intensity biking may deplete glycogen (w/o chewing muscle) enough to warrant an anabolic response in the face of proper post-cardio nutrition. Thoughts? Anyone else do this?