Influence of body position on transcutaneous stimulation of posterior and anterior roots

Peak-to-peak amplitudes of the responses to transcutaneous spinal cord stimulation in quadriceps, hamstrings, tibialis anterior and triceps surae in prone, supine and standing positions at 25 intensity levels (5 to 125 mA in 5 mA steps) of 10 subjects. There are four dimensional arrays in the mat file, ptpFirstResponses and ptpSecondResponses for the first and second responses, respectively. The first dimension is the musce group in following sequence left quadriceps, hamstrings, tibialis anterior and triceps surae followed by same muscles on right leg. The second dimension is the stimulation intensity, 5 mA in 5 mA steps to 125 mA. The third dimension signifies the subject. Finally, the forth dimensions describes the body position in following sequence: 1) supine, 2) standing and 3) prone.