P239 Muscle contraction does not always trigger the appearance of motor evoked potential polyphasia in healthy individuals

Motor evoked potentials (MEP) using magnetic stimulation are a non-invasive method that assesses the integrity of the central motor pathway. A phase is a part of the motor unit action potential that falls between two baseline crossings. Previous studies suggest that voluntary muscle contraction increases the appearance of MEP polyphasia. In this study we examined healthy individuals with the use of MEP, in order to evaluate the probability of polyphasia appearance during both muscle contraction and relaxation.

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