Thanks for the information Fyzzio. Just to clarify what I'm doing and why I'm seeing the tool useful in my practice. As of RSD, I'm using Heart Rhythm Scanner to measure the sympathetic/parasympathetic balance. If I'm seeing that my treatment caused sympathetic activity normalize (or at least move towards the correct direction) then it is a real confirmation that the particular treatment was successful. The tool actualy shows me the shift for both sympathetic and parasympathetic activities with pre- and post- assessments on the patient. You see it is very tough to get from patient objective answer whether the pain was actually relieved. Of course if my treatment significantly reduced pain my patient would report that but in most cases single treatment isn't very effective. Here the benefit of using machine comes
As of your case to measure muscle strength, I've seen a mechanical device with a gauge that patient squeezes with his wrist. That one actually shows the strength of his muscles... Maybe you can use such a device in conjunction with Fitness Test from Health Reviser (tool again ) which is useful to make a correction on the mechanical device reading... Just because the fitness test would take care of the current physical condition (any performed fitness activities will be taken into account, time of the day etc ).