Figure 1.

PMCT-APB

The APB was innervated by the median nerves (C8 and T1 nerve roots), with the main myotome being T1. The CMAPs and F-waves were also recorded following supramaximal electrical stimulation of the median nerves of the wrist. The PMCT, excluding the turn-around time at the spinal motor neuron (1 ms), was calculated from the latencies of the CMAPs and F-waves as follows: PMCT=(latency of CMAPs + the shortest latency of F-wave -1)/2. PMCT=(5.1+27.4-1)/2=15.75ms.

PMCT, peripheral motor conduction time; APB, abductor pollicis brevis; CMAPs, compound muscle action potentials.