 Nerve Conduction Study NCS - Nerve conduction is recorded through surface electrodes to measure conduction in the peripheral nervesSurface EMG electrodes are placed at a known distance away from the stimulating electrode over the muscles innervated by the studied nerve soleus, tibialis anterior, extensor digitorum longus. Ground straps are placed on thighs. Repeated single-pulse electrical stimulation is delivered at very low intensities for the recorded muscles for each of the three nerves evaluated. Stimulation delivery rates will not exceed 2 per second. 