Impact of Aging on Nerve Conduction Velocities and Late Responses in Healthy Individuals.

Background: Nerve conduction studies are performed to diagnose the disorders of the peripheral nervous system. The reference values for nerve conduction velocity (NCV) and late responses for different nerves considerably vary in different group and type of population. Physiological factors such as age, temperature, height, and gender affect the NCV. However, there are very few studies which show the age group at which these changes become significant.

Aim And Objectives: The aim of the study was to establish the electrophysiological data of the specific age group at which changes in NCV as well as late responses of median common peroneal nerve and also see the late response in the form of F-waves and H-reflex.

Methodology: Study groups were divided into three categories based on the age: Group I (18-30 years) ( = 80), Group II (31-45 years) ( = 43), and Group III (46-60 years) ( = 27). Out of which, 93 patients were male and 57 were female. The NCVs were determined for median, common peroneal nerve (motor component and sensory component) along with late responses in the form of H-reflex and F-waves.

Results: The mean and standard deviation of median, ulnar, peroneal, and tibial nerve was studied for latencies, amplitude, and velocities for both sensory and motor components. Patients with older age had longer latencies, smaller amplitudes, and slower conduction velocities compared with the younger age group. The change with age was greater in sensory nerve conduction and late responses in all the peripheral nerves.

Conclusions: Aging has a definite correlation with the NCV and late responses of different peripheral nerves. There is a need to have reference values with relation to age.