0129 It is known that less capacitance will be encountered by a high-voltage source of electrical stimulation than by a low-voltage source. Therefore, high-volt sources should be more comfortable than low-volt sources because of lower tissue impedance. Due to the increase in comfort utilizing a high-volt source, a better quality of contraction should be achieved. PURPOSE: To determine the effect of skinfold thickness on two electrical stimulation waveforms. METHODS: Eighteen college-age males and females (7 males and 11 females, age 21.6 ((2.7) y) volunteered for the study. Skinfold thickness was determined at one half the distance between the ASIS and superior border of the patella using Lange calipers. Subjects were seated on a Biodex system 3 isokinetic dynamometer, the axis of rotation was aligned with the knee joint line of the test leg, and the torque arm pad placed 2 cm proximal to the medial malleolus. A bipolar arrangement was utilized with one electrode being placed on the proximal thigh (anode when using HVIC) just distal to the inguinal crease and the other electrode placed over the Vastus Medialis Oblique (cathode when using HVIC). The subject's knee was then placed in 10 degrees of knee flexion below the horizontal. This was the testing position from which all measurements were taken. The electrical stimulation treatment was then administered to the subject with the type of waveform being randomized between patients. The intensity was increased until the subject experienced a strong isometric contraction, which was visually reinforced with a RPE scale. The contraction corresponded to a 5 on a 10-scale. Once a strong contraction was achieved, the intensity was then reset to zero and the testing procedure was completed. The same methodology was utilized on the opposite leg with the other waveform being utilized. All stimulation was given with a Vetra Pro 4 stimulator (Chattanooga, Inc., Chattanooga, TN). Peak torque values were collected during the testing protocol utilizing Labview software with data collected at 1000 Hz. A Pearson R was used to determine the relationship between skinfold thickness and torque produced with each respective waveform. RESULTS: An inverse relationship was found between electrically induced torque and skinfold, demonstrating that the greater the skinfold value, the lower the effect of electrical stimulation on electrically induced quadriceps contraction. Analysis showed Russian current with an r = −.565 compared to an r = −.129 for HVPC. CONCLUSIONS: It may be more beneficial to use high volt electrical stimulation on people with higher levels of subcutaneous fat than to use Russian electrical stimulation.