S14-2. F wave and spinal excitability; masseteric contraction or motor imagery enhances ulnar nerve F wave

We tested the validity of instructing patients to clench the teeth to facilitate F-waves recorded from a limb muscle in clinical practice. We explored to study effect of motor imagery and voluntary contraction of the masseter muscles on F waves recorded from the first dorsal interosseous muscle in healthy subjects. F waves were recorded at rest, during motor imagery and during voluntary contraction monitored by a force transducer to maintain the level at 10% of maximal effort. F-wave persistence increased from at rest to during motor imagery, and during voluntary contraction.

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