Sound Evoked Triceps Myogenic Potentials

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Abstract

Objective:

To determine if a sound evoked myogenic potential could be obtained from the triceps with the recording and stimulus parameters routinely used to obtain a vestibular evoked myogenic potential (VEMP) from the sternocleidomastoid.

Study Design:

Prospective study of myogenic potentials recorded from the triceps in healthy subjects. We used a monaural acoustic stimulus and measured the unrectified myogenic potential using surface electromyography electrodes, using response-triggered averaging, on the triceps of 18 subjects.

Setting:

University-affiliated otoneurology clinic.

Patients:

Eighteen healthy adult volunteers (11 women and 7 men), age ranging between 27 and 36 years.

Main Outcome Measures:

Latencies and amplitudes of the first two waves of the evoked response.

Results:

The P1 latency was 36.83 ± 8.42 ms (range, 26.34-57.99 ms; 95% confidence interval [CI], 33.53-40.14 ms), the N1 latency was 43.74 ± 8.80 ms (range, 34.67-66.32 ms; 95% CI, 40.29-47.19 ms), the P1-N1 interlatency was 6.90 ± 1.23 ms (range, 5.21-9.79 ms; 95% CI, 6.42-7.39 ms), and the P1-N1 interamplitude was 93.23 ± 51.25 μV (range, 16.33-206.62 μV; 95% CI, 73.14-113.32 V).

Conclusion:

A monaural sound stimulus elicits a robust and reproducible surface myogenic potential in triceps muscles.

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