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Study of Nerve Conduction and Late Responses in Normal Chinese Infants, Children, and Adults

Department of Paediatrics, Children's Hospital, Chongqing University of Medical Sciences, Chongqing, China

Jiemin Zhang, MD

Department of Paediatrics, Children's Hospital, Chongqing University of Medical Sciences, Chongqing, China

Healthy Chinese individuals (n = 168), aged from 24 hours to 30 years, were studied to establish the following normal values: (1) motor conduction velocity, distal latency, amplitude, and F-wave velocity in the median, ulnar, tibial, and peroneal nerves; (2) H-reflex velocity and latency in the tibial nerve for all subjects as well as in the median and ulnar nerves in infants; (3) sensory conduction velocity, latency, and amplitude in the median, ulnar, and sural nerves; and (4) the dif ference in minimal latencies of both H-reflex and F-waves between corresponding nerves in opposite limbs and between two nerves in the same limb. The motor conduction velocities, sensory conduction velocities, F-wave velocities, and H-reflex velocities in newborns were approximately 50%, 40%, 40 to 45%, and 40 to 45% of adult values, respectively. At age 3 years, the normal values were in the adult range for all motor conduction velocities and for the sensory conduction velocities in the upper limbs. The sensory conduction velocities, H-reflex velocities, and F-wave velocities in the lower limbs did not reach adult values until age 6 years whereas the upper limb F-wave velocities reached adult levels between 6 and 14 years in different nerves. These results indicate that adult values for nerve conduction velocities, including the late responses, are reached earlier in the lower extremities; however, conduction velocities at any age are always faster in the upper limbs and in the proximal compared to the distal segments. The maturation process occurs most rapidly during the first 3 to 6 years of life, especially in the first year. This parallels the histologic development of peripheral nerves during childhood. (J Child Neurol 1997; 12:13-18).

Journal of Child Neurology, Vol. 12, No. 1, 13-18 (1997)
DOI: 10.1177/088307389701200102


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