Which energy system deconditions first when training has stopped: anerobic system or the aerobic system? Why?

Question

Do you also know the rate at which the energy systems deconditions?

I mean when training has stopped for a period of time, like a week or two.

Answer 1

I'm going to say Aerobic System because after training you decondition pretty fast.

Anerobic is consistent conditioning.

Answer 2

You can't really change the anaerobic metabolic system via training. What you can do is increase the point at which this system kicks in. For example, with superatheletes they could be going at 180 bpm, but still not undergoing anaerobic work, since their hearts and CV systems are conditions to pump out alot of oxygen. When you stop working out so much, the threshold slides back, so for example when you are out of shape, you'll hit anaerobic work at 130 bpm. The thing is that no-one can survive a long period (more than a few minutes) of anaerobic work, ie at 200 bpm; conditioning won't do anything for this (or very little). The major effect of training is increasing oxygen transport, and decreasing the amount of energy required for the muscles.