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Effect of motor imagery and voluntary muscle contraction on the F wave

We tested the validity of instructing patients to minimally contract the muscle to facilitate F‐wave recording in clinical practice. In 12 healthy subjects, F waves were recorded from the first dorsal interosseous muscle at rest, during motor imagery, and at up to 30% of the maximal voluntary contraction (MVC). F‐wave persistence increased significantly from 32.5 ± 11.9% (mean ± SD) at rest to 58.3 ± 15.2% during motor imagery and 90.0 ± 8.7% during 3% MVC. It then remained the same during stepwise changes to and from 30% MVC before decreasing significantly from 80.8 ± 18.5% during 3% MVC to 48.7 ± 23.8% during motor imagery and 27.0 ± 16.0% at rest. The trial average of F‐wave amplitude showed a similar pattern of facilitation. Motor imagery enhances F‐wave persistence and amplitude, which further increase with a slight muscle contraction and show no additional change with a stronger effort. Muscle Nerve, 2010