To the Editor: I read with interest, in the May 1985 issue of Physical Therapy, the article by Mohr et al entitled “Comparison of Isometric Exercise and High Volt Galvanic Stimulation on Quadriceps Femoris Muscle Strength” and the follow-up commentary by Barr. Mohr et al stated in the literature review section that no published studies have evaluated the effect of high voltage electrical stimulation (HVS) on strengthening muscles. I expected Barr to correct this erroneous impression in his commentary (which I presume was written recently), but he alluded to the same mistake when he restated that “no previous investigation has used HVS.” Recent studies that used ElectroStim 180-2 myostimulator noted gains in muscle strength following 12 or more treatment sessions.1–3 ElectroStim 180-2 is a high-frequency (2,500 Hz) electrical stimulator with a voltage output of 400 V1; therefore, it meets the criteria of a high-voltage stimulator.4… [ ARTICLE][1] [ ARTICLE][2] [1]: /lookup/volpage/65/606?iss=5 [2]: /lookup/volpage/65/609?iss=5