Motor nerve conduction velocities in normal children and in children with neuromuscular diseases. Especially regarding victims of cerebral palsy.

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We examined the motor nerve conduction velocity of the ulnar and tibial nerves of normal children, children with cerebral palsy and children with other neuromuscular diseases.(1) The conduction velocity of the tibial motor nerve increased rapidly untill 2 years of age. It came to a plateau at 3 to 5 years of age and remained constant untill coming of age.(2) The average conduction velocity of the tibial motor nerve affected by a change of the skin temperature remained constant from 26 to 34°C, but it slowed down sharply under 25°C.(3) Between the normal and the cerebral palsied children of each age from 0 to 10 years, there was no significant difference in the motor nerve conduction velocity of the ulnar and tibial nerves.(4) There was also no significant difference between the affected side and non-affected side of hemiplegic children.(5) We noticed that there was a lag in the nerve conduction velocity in children suffering from Charcot-Marie-Tooth, Friedreich and Beriberi.(6) In order to test the recovery time of skin temperature, latency time and nerve conduction velocity, normal adults were placed in a refrigerated room (2-3°C) for 30-40 minutes. After leaving the refrigerated room, the. recovery time required was 2 to 4 times the cooling time. This may suggest that neuromuscular dysfunction is involved in the causes of cooling disorder.

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