In my opinion, you should target practice for the most part at the weight you want to hunt at. If all you are doing is target practicing, that is a different thing, but for hunting, keep it the same. Perhaps with an injury you need to limit the # of shots you take at one time. Just take one arrow out with a broadhead or a practice broadhead on it and shoot it a few times from different distances. Makes it more like real hunting situations and doesn't tire the muscles and hurt the joints as much. I also like to do various things, such as come to full draw, hold it for 30 seconds and then shoot, or give myself to the count of 5 to make the shot before having pulled back. You don't have to shoot as many arrows in a row, and it is more fun to me. To each his own, though. I am sure that many of you folks do things like this as well.
If, with a shoulder dislocation or something similar, you are unable to consistently and comfortably shoot at the pull you want to hunt at, you may want to trade in for a lighter weight bow.