from my experience this is case of your tendon and ligamnets not being as strong as your muscles - so whilst you can lift the weight, they are trying to catch up.
I wouldn't try to alleviate pain here - tendon and ligamnets shouldn't be used when painful - they don't recover like muscles and if you injure them then you're out of the game for a LONG time. So keep the pain and that way you'll safeguard from putting to much strain on them, cause it hurt like buggery.
They will condition quite quick though, and you'll be back to pain free joints in no time.
Sorry, I know that's not what we want to here. It's like the doctor saying, "well, you've had a bad cold, I suggest you don't go to the for, oh, about 6 weeks . . ."