“…However, a set of standard parameter combinations referred to as "TENS modes" have been introduced (52). These modes include conventional TENS (high frequency, low intensity), acupuncture-like TENS (AL-TENS) (low frequency, high intensity), and intense TENS (high frequency, high intensity) (27,52,58,59). Conventional TENS is traditionally associated with the Gate control theory with blocked nociception at the spinal level.…”