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Journal of the Korean Academy of Rehabilitation Medicine 2000;24(1):58-64.
Changes of Compound Muscle Action Potentials Related to Voluntary Muscle Contraction and Alteration of Muscle Length in Peripheral Neuropathy.
Park, Byung Kyu , Kim, Hoon , Park, Ho Joon
Department of Rehabilitation Medicine, Pusan National University College of Medicine.
말초신경손상 환자의 근수축과 길이변화에 따른 복합근활동전위의 변화
박병규, 김훈, 박호준
부산대학교 의과대학 재활의학교실

To investigate waveform changes of compound muscle action potentials (CMAPs) related to voluntary muscle contraction and alteration of muscle length and to evaluate the effect of peripheral neuropathy on temporal and spatial summations of CMAPs.

The influence of voluntary muscle contraction and alteration of muscle length on CMAP was studied in 37 median nerves of 21 patients with median neuropathy.

In patients with no apparent axonopathy, temporal summation was partially disturbed without significant change of spatial summation. Shortening of muscle length or voluntary contraction produced a physiologic improvement of spatial and temporal summations. There was a decrease in temporal and spatial summations, more prominent in temporal summation, with lengthening of the muscle. In axonopathy, spatial summation was markedly deteriorated with partial reduction of temporal summation. Spatial summation was not affected by the change of muscle length or voluntary contraction. Temporal summation was improved by muscle shortening or voluntary contraction and was decreased by muscle lengthening.

Peripheral neuropathy has an effects on physiological spatial and temporal summations of CMAPs. Temporal summation is preferentially decreased in cases without axonopathy. When axonopathy is apparent, spatial summation is profoundly disturbed with partial reduction of temporal summation.

Key Words: Compound muscle action potential, Muscle contraction, Muscle length, Peripheral neuropathy, Spatial summation, Temporal summation


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