I wouldn't recommend it.. it would have to be done in the morning (unless you don't eat half of the day, which I hope you don't), and since your body is in catabolic state when you wake up, it'll be detrimental to your muscle. You want to replenish your muscle glycogen stores before doing cardio with a light protein shake and some amino acids (BCAA typically) mixed in it. Then go do your cardio 20 min. later