I keep reading that dodge rolls, blocks, bashes, etc are a percentage of your stamina. Because of this I remade my full stamina character into a heavy armor magicka build for fun with super high stamina regen and adrenaline and no points or enchants in stamina leaving me with just 8000+ stamina. I notice that a single dodge takes off more than half my stamina bar. Blocks don't seem as bad but not really paying much attention. But dodge was very obvious.