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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...
We studied the stretch reflexes, an early R 1 and a late R 2 , by tapping the voluntarily contracted erector spinae muscles and recording from the same spinal level with the subject in the prone position. The onset latencies increased progressively towards the caudal level from 8.8 ± 0.7 ms at T 5-6 to 15.9 ± 1.1 ms at L 4-5 for R 1 , and...
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