I am a 22yo male, 5'8" 170lbs, and have been training for about 2 1/2 months. I am doing the Bill Starr 5x5, which calls for 5x5 deadlifts once a week. I have been steadily increasing the weight with no problems, and last week did 215 5x5 without a problem.
However today when I was warming up for Deadlifts I noticed that my lower back seemed pretty stiff, but I figured it would loosen up during my warm up. However, when I went to pull 225 it seemed much heavier than it should be and I got 2 reps with a struggle, and on the third rep as I was pulling up I felt a sharp sensation in my abdomen, and immediately set the weight down.
It doesnt hurt right now, but it definitely freaked me out. I tried searching for some advice, but couldn't find any. I was wondering if I should just lay off deadlifts for a bit, or just use lower weight. Has anyone experienced this before that can help me out?
Also, the variables that were different today were that I worked out in the morning vs. at night and that I started with the bar closer to my shins than last time. I had read the Mastering the Deadlift articles, and tried to adjust my form to match. I'm thinking I had my hips further back and higher, which placed too much strain on my back/abdomen and not enough on my posterior chain.