If you are having any muscle spasms, cramping, or general achy soreness, I would recommend trying an IFc stim (interferential stimulation) over a TENS.

info & differences -
http://vitalityweb.com/backstore/Muscle-Stimulator.htm

adding..

Many PT places and/or chiropractors have TENS and IF stim available so you could try both to see which might help or not.

Then if it does help often you can buy one for at home for around 100.00 or so.

I bought this one on Amazon (for my RSI/TOS/CMP) -
http://www.amazon.com/4KTM-digital-i...ential+digital