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Strength training while undergoing radiation treatment

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Stan is 71 years old and has cancer. He was slated to undergo 70 straight days of radiation treatment along with estrogen therapy. He was told by his doctor that he would lose strength if he didn't exercise, and that the strength loss would likely be permanent. 
 
Stan began strength training. Stan's recovery abilities were already compromised from the trauma of the radiation. Strength training produces a stimulus. That stimulus is trauma to the muscles and to the entire system. As a result of the exercise, the body as a way of achieving self-preservation, makes a positive adaptation by becoming stronger.
 

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Shoulder pain and referred pain finally disappears

personal trainers at work personal training New Orleans

I was sitting in the dentist chair getting my teeth cleaned, and I began to moan. Not because of a recent Achilles operation, not because of my teeth, no it was because of pain in both my shoulders.  In addition to pain in my shoulders, for weeks I had been having referred pain running down my arms, and numbness in both my hands down to my fingertips. It was intolerable. Sleeping was horrible. My range of motion was increasingly becoming restricted, and the outlook looked worse if I did not do something. One shoulder was well on its way to becoming frozen.

My doctor gave me a couple Cortisone shots, and I went to physical therapy.  The pain dissipated and I was discharged.  I was still somewhat restricted in my use, and I could see the possibility of the pain flaring up again. I began strength training again. My trainer restricted my range of motion to a pain-free range. The range was very small at first, but it increased over time. Each week he had me lift a little more. Slowly my range of motion increased and the last remnants of pain disappeared.  I did not have to get into a special position to sleep.  I just slept hassle-free.

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Exercise Intensity

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What is exercise intensity and why is it important?

In simplest terms it is how hard an exercise is at a point in time.  It is the level of momentary exertion during exercise.  This can be quantified by measures such as a person's heart rate expressed as percentage of one's maximum heart rate or pounds of weight lifted expressed as a perecentage of one's one-rep maximum lift. Exercise of sufficient intensity is necessary to stimulate the body to make a change.  When the body is worked beyond what it is equipped to handle the body adapts as a form of self-protection.   The body will make a positive adaptation only if given enough time to recover from the exercise.  

How high should the level of exercise intensity be?