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| | Transcutaneous Electrical Nerve Stimulation, or a TENS unit, for back pain relief |
 | | High frequency stimulation, sometimes called "conventional", is tolerable for hours, but the resultant pain relief lasts for a shorter period of time. |
 | | Low-frequency stimulation, sometimes called "acupuncture-like", is more uncomfortable and tolerable for only 20-30 minutes, but the resultant pain relief lasts longer. |
 | | Electrodes can be placed over the painful area, surrounding the painful area, over the nerve supplying the painful area, or even on the opposite side of the body. |
| www.spine-health.com /topics/conserv/electro/el02.html (264 words) |
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