In reply to paulmcg:
I did exercises with very light weights (2.5Kg) that in no way whatsoever caused any strain on my rotator cuff tendonitis, but simply increased blood flow to the shoulder muscles, and the surrounding area. If it hurts the injury stop.
I did things like lying on my back, and pushing the weights straight up at 90 deg to the floor. And standing, pushing weights straight up towards the ceiling from the shoulder. No sideways strain, just straight. Until you get muscle burn, then stop, breathe deeply to get lots of oxygen in your system, and repeat.
Then massage in some ibuprofen based gel - anti-inflamatory, plus the massage - and finally go to bed with a hot water bottle on the injured shoulder.
NB If any of the exercises make the injury twinge, then stop. They are not to strengthen muscle around the injury, or to exercise the injury. They are to increase blood flow to the injured area, to increase capilliarity, which aids your body's natural healing processes.
I had a persistent left shoulder pain for months until I tried the above, and it was gone in a couple of weeks. Not sure if you'd get the same results if the injury is fresh, then again you may not be able to do the exercises if the injury is fresh.
Again, if it hurts the injury, then stop. Find an angle where you can do a light exercise that does nothing but increase blood flow to your shoulder.
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