Tweaked your lower back muscles. Give them rest.
This is why you do not focus on the negative portion of the lift. The eccentric movement means nothing in terms of muscle gain or strength. It only sets you up for getting hurt. Once you reach lockout you should let the weight fall. Control it so it don't roll away, but do not try to lower it down slowly. It is called "deadlift" for a reason. You lift it from a dead position. The concentric phase, or lifting up, is all that matters. I see so many people hurt their backs trying to go slow on the way down to "give a good negative".
That aside, your back was most likely rounded instead of arched and flat. ;-)
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