I don't quite understand what your back dips are. Are you lying on your spine? Could it possibly be a neurological problem? I've gotten a similar sensation when I was in a car accident and had some back "sprain" once things got straightened out and inflammation went down I felt like the strength came back.
Another thought is that it could be circulation. B vitamins and Calcium are both helpful with that. I used to get terrible leg cramps when I was pregnant. I know this isn't a leg cramp but mine were caused by the lack of circulation. When I started taking a Bcomplex suppliment and calcium suppliments I got relief.
Two ideas for you anyway. It wouldn't hurt to see a Dr about this. If it is related to either kind of problem then it's something they should look at.
This might help
http://my.webmd.com/content/healthwise/210/69258
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