Mavor and Shiozawa [2] recorded antidromic median sensory responses in 21 normal (Table 2) subjects (16 men and 5 women, age range 15–71 years) using surface ring electrodes for recording to the first interphalangeal joint of digit II. The reference electrode was placed 3 cm distally to the same finger. The authors used 30 % supramaximal stimulation with 0.2-ms duration. Skin temperature was measured using a thermistor at the elbow, wrist, palm, and finger before and after each test in all subjects. When necessary, the arm was immersed in 40 °C water for ten minutes. Latency was measured from the onset of stimulus to the initial negative deflection of the sensory response, and latencies between the elbow and wrist were calculated by subtraction. The distances between cathode stimulation sites and active recording sites at the levels of the wrist and elbow were measured using a millimeter tape. They also performed antidromic nerve conductions recording from digit III (R) and stimulating at the level of the wrist (S1) and at the elbow (S2). They did not use a fixed distance between the recording and stimulation sites. Distances between wrist (S1) and elbow (S2) stimulations were taken using a measuring tape, and latencies for antidromic conduction between the elbow and wrist were calculated by subtraction. In all subjects, careful attempts were made to control skin temperature; right hands were warmed in 40 °C hot water before each test. The authors used supramaximal stimulation (greater than 30 %) and 0.2-ms duration. Onset latencies, negative peak latencies, negative peak amplitude, peak to peak amplitude, and nerve conduction velocity (in the wrist–elbow and wrist–digit III segments) were calculated. Values for two subjects were eliminated because of substantial interference by muscle action potential after elbow stimulations.

Melvin et al. [3] studied 24 dominant hands of 24 healthy volunteers (Table 3) and 17 dominant wrist from 17 patients (Table 4) with carpal tunnel syndrome (CTS), using surface ring electrodes for recording to digit II (active and reference electrodes were placed 4 cm apart on the finger) and stimulating the cathode placed 14 cm proximal to the active electrode at the wrist. They measured distal latencies (ms), forearm velocities (m/s), amplitudes at the wrist and at the elbow (μV), and the duration of the antidromic sensory responses at the wrist and at the elbow (ms). Separate digit II and digit III values were not reported.