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In Vivo Canine Muscle Function Assay

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Tibial nerve F-wave recordings.

Sanjeev D Nandedkar¹, Paul E Barkhaus²

¹Natus Medical Inc, 15 Dartantra Drive, Hopewell Junction, New York, USA.

|April 8, 2015

Summary

Tibial F-wave recordings are complex due to volume conducted signals from foot muscles picked up by the reference electrode. This study clarifies the origin of these complex tibial F-wave patterns.

Keywords:

A-wave F-wave persistence F-waves far-field recordings tibial nerve

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Area of Science:

Neurophysiology
Electromyography

Background:

Tibial F-wave recordings exhibit notable complexity and persistence.
The reference electrode (E2) placement is hypothesized to influence these complex patterns.

Purpose of the Study:

To investigate the source of complex tibial F-wave recordings.
To determine the role of the reference electrode in tibial F-wave complexity.

Main Methods:

Tibial F-wave recordings were performed on 10 subjects from the abductor hallucis (AH) muscle using a standard montage.
Simultaneous far-field F-wave recordings were obtained from the AH, base of the large toe, and base of the small toe, with the E2 electrode on the contralateral foot.

Main Results:

Recordings using the standard method and from toe bases showed complex waveforms and similar latencies.
Recordings from the AH to the contralateral foot generally yielded simple waveforms.
In some subjects, recordings from the AH-contralateral foot showed longer latencies or reduced persistence.

Conclusions:

Tibial F-waves are primarily composed of volume-conducted signals from tibial-innervated foot muscles.
The E2 electrode placement significantly contributes to the observed complexity in tibial F-wave recordings.