Duration of pulse was 0.3 ms and the machine used was a Viking Myograph type IV (Nicolet Biomedical) electromyograph. Sensitivity, low-frequency filter, high-frequency filter, sweep speed, and rate of pulse were not specified.
This study was performed in the supine position, with the hand manually fixed by the examiner to reduce movements and artifacts.
Following the antidromic method [
1], the sensory nerve action potentials (SNAPs) were recorded using ring electrodes placed distally to digit II (index finger) and to digit III (middle finger). The active recording electrode was placed around the first interphalangeal joint for both the digit II and digit III recordings. The reference (R) electrode was placed distally at least 3 cm from the active recording electrode. Digit II and digit III recordings were performed separately (Figs.
2). The ground (G) electrode was placed between the stimulation and recording sites (the figure shows ground...
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