I normally don't do leg presses. I had just finished deadlifting, so my legs were already a bit taxed, and started doing the leg press. After the first set I locked in the weight and dropped my feet to the floor with my knees still up. Within 20 seconds my legs were burning so bad I had to drop my knees so my legs were straight across the floor. I tried it after the next few sets with the same effect. Tremendous pain!
Is that normal? Do I have bad circulation to my legs? Is this just lactic acid buildup? And what kind of effects could this have on muscle growth?