Probably better in the physical section. Anyway, the mechanism of TENS is re-attenuation of nerves for 3 to 4 hours. But they can also help with relaxing muscles that have tension from nerve activation, but my guess is less due to inflammation. There are plenty of papers on abnormal leg nerve activity for people with RLS, so the correct TENS use is just a given as being effective.
I use a TENS EMS combination, which hits the nerves and flexes the muscles, helping to relieve all tension.
TENS are definitely complex to use in some situations for RLS, especially for some of the more supportive muscles in the calf, but should do the job nicely with PLM if you can find the right muscles to target.
) works well for light to medium symptoms, or you can use a knee wrap for the same result. It should work for PLM as well. The mechanism seems to be compressing the sciatic nerve at the top of the thigh disrupting signals, as well as bit of restricted blood flow. I was concerned about increase in blood pressure if used all night but testing showed it wasn't changed.