@MikeMason-- I agree with @turkay1. If you don't have any soreness or swelling, it might just be a pulled muscle. A tear in the quadriceps will cause soreness, tightness and pain.
I tore my quadriceps twice. The first time, I fell down and tore it. The second time, I tore the same quadriceps again during exercise because I pushed myself too hard. Both times, I had soreness and tightness for months. I was limping the first several weeks and I would get swelling on and off.