steroids ruining cardio

i always thought the bad cardio resulting from roids was just from the added bulk, but i read something written by a fighter saying he used them and ages ago and was still trying to get his cardio back. do they actually stuff up the way cardio works or is it just from the added bulk and energy needed to work the extra muscle?

Some steroids can contribute to high blood pressure, which can affect cardio.

some make cardio easier