nevlaw

I believe from reading an article somewhere that it is actually a bad idea to do both in the same day, but not impossible to do both in the same week, or perhaps getting your cardio in a weekends.

I think the reason stated was that if your doing cardio and weight training in the same day is that once your body has burned of the spare cals, your body turns to the next available immediate source of energy. The article lead me to believe that your muscle is the next source of immediate energy to the body and therefore begins to break down the muscle to fuel itself.

Like i said i read this somewhere a long time ago, a few errors maybe in there from memory but basically the body using the muscle as energy was the basis of the article