Is mechanical pain threshold after transcutaneous electrical nerve stimulation (TENS) increased locally and unilaterally?
Background and Purpose. It is not fully understood how transcutaneous electrical nerve stimulation (TENS) intensity affects mechanical pain threshold. Method. Sixty-six healthy volunteers (13 male, 53 female; 132 hands) without prior experience of TENS participated in the study, which comprised a randomized single-blind controlled trial. TENS was administered for 20 minutes through electrodes (25 x 25 mm) placed on the hands and forearms with a fixed frequency of 100 Hz and pulse duration of 150 micros. TENS intensity was randomized and allocated in a concealed manner so that one arm received TENS with stimulation intensity set at participants’ subjective sensory threshold and the other received TENS with stimulation intensity continuously adjusted by physiotherapists to a strong but comfortable non-painful stimulation. Observers were blinded to stimulation intensity levels. Results. Mechanical pain threshold increased significantly, by a mean total of 0.79 kg/cm(2) (95% confidence int
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