“…Several studies did not report intervention parameters in detail; 19 trials 35–37,40,41,47,48,50,52–54,56,62,65,68,73,74,76,77 did not report intensity and/or frequency of the current. Related to studies that used transcutaneous electrical nerve stimulation ( n = 31), three studies 43,44,56 used low frequency (10 Hz or less), 15 36,45,46,49–51,57,58,60,63,64,66,67,69,75 used high frequency (50 Hz or more), one 59 used 35 Hz, and six 37,38,55,71,72,74 modulated the intensity. For microcurrent therapy, intervention parameters reported were more consistent; two studies 53,56 used 0.3 Hz, and one 49 used 0.5 Hz.…”