we know that the Phosphagen system and the fast glycosis systems use carbs/protein as their primary enegery source(intense acitivity) and that the Oxidative/slow glycosis system uses fats in the place of carbs
So my questions, if your doing an endurance actitivty(going for a medium paced few mile jog) which enegery system kicks in first? Would it be the oxidative/slow system or would it but the phosphagen/fast system even though it’s a low intensity acitivity?
All systems are used simultaneously, but at different degrees depending on intensity and duration -not one exclusively, I mean.
To your question, Phosphagen/Fast Glycolysis initially (O2 Deficit) followed by Oxidative/Slow Glycolysis; time and proportions depend upon the pace being steady or not and of course, duration.
Hope it helps!
Bigpump23, I am still trying to learn about these energy system so I do not know if this is a good article but it does explain a lot of the science Shhhhtuf that goes on in energy systems:
http://www.coacheseducation.com/phys/EngSys.html
yes but its low intensity so unless I sprint I would think it’s the oxidative system
Whatever the intensity of the exercise, the phosphagen system has to come first! You need some ATP immediately, which has to come from this system, as the oxidative is not capable of catching up that fast.
In your particular example, this response will change, of course, with the oxidative system becoming the predominant one after a very short period of time, but this isn’t the first step.
Hope it helps!
PS the sequential order refers to the predominance of each system only and not its exclusive use.
Spot on Nik!!! 