Motor unit action potentials

Motor unit action potentials

Spikes of electrical activity recorded during an EMG that reflect the number of motor units (motor neurons and the muscle fibers they transmit signals to) activated when the patient voluntarily contracts a muscle.
Mentioned in: Electromyography
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
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References in periodicals archive ?
(2) Electromyogram revealed polyphasic low amplitude motor unit action potentials of slow duration consistent with partial nerve root lesion.
The long head of the right biceps femoris showed large polyphasic motor unit action potentials with decreased recruitment and absence of denervation potentials.
Electromyography of supraspinatus, infraspinatus, masseter, deltoid and biceps muscles bilaterally revealed small polyphasic motor unit action potentials (MUAP) with early recruitment pattern consistent with a myopathic disorder.
However, significant differences were seen between the primiparous and the nulliparous subjects in the motor unit action potentials recorded by EMG.