How to Adjust the TENS Unit Settings
Depending on your TENS unit, you will most likely have to adjust the device settings to find the proper level of pain relief, and these settings include:
Setting TENS Unit Mode
Most TENS machines feature three modes: normal, burst, and modulation. The burst setting is the most effective in eliminating chronic shoulder pain among these three modes. However, through the process of trial and error, you will be able to find a mode setting that meets your needs.
Setting TENS Unit Frequency (Pulse Rate)
A TENS unit's frequency or pulse rate is determined by the number of shocks per second, measured in Hertz (Hz). As the frequency changes, so do the unit's effect on shoulder pain. For instance, a rate of 2hz to 10hz is recommended for chronic pain, and a rate of 35hz to 50hz for muscle stimulation. Lastly, a rate of 80hz to 120hz is the optimal frequency for acute shoulder pain.
Setting the TENS Unit Pulse Width
The duration in which each pulse lingers is known as the pulse width, and by increasing the width, you can increase the power of your TENS machine. The average pulse is measured in microseconds, so keep in mind that when you adjust the pulse width, you may not visibly notice any difference, but you can rest assured that your nerves will take notice. As with other TENS unit settings, you must experiment with the settings to find out which one is most effective for you.