If you have a Tens machine where you can alter the puse wave length and frequency its worth understanding how the different tens modes work and when they should be used to get the most out of tens.
Tens is like any other kind of pain relief. If you use it properly it should work really well. But its not as simple as what the shops tend to market it. Sticking the pads where the pain is and switching it on is like taking paracetamol when you have a headache. It will help short term for people who only suffer from mild headaches.
For people with chronic pain and reccurent injuries you need more than a quick fix.
This is a little book that explains TENS and helped me to understand it and get the most of TENS.I was working with the Author who was my Pain specialsit who got me using TENS http://www.alanking.net/kings-guide-to-tens.htmlhttp://www.electrotherapy.org/modalities/tens.htm
Is a site that explains TENS in a more detailed way
If you are using a machine that allows you to alter the pulse frequency and wave length the following are the usual parameters to be using. :
Hi tens (normal tens) - Acute pain/Sudden injury, Immediate pain
Mode (N) : 90-120 Hz frequncy , 100vs wave
Lo tens (accumpuncture tens) - chronic pain/preventative
Mode (B) : 2 - 5 Hz, 200-250vs vs wave