Sound evoked triceps myogenic potentials.
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.


METHODS
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.


METHODS
University-affiliated otoneurology clinic.


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


METHODS
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 microV (range, 16.33-206.62 microV; 95% CI, 73.14-113.32 V).


CONCLUSIONS
A monaural sound stimulus elicits a robust and reproducible surface myogenic potential in triceps muscles.
Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611-5800, USA. m-cherchi2@md.northwestern.edu
Marcello
M
Cherchi
Nicholas P
NP
Bellinaso
Katrena
K
Card
Ashley
A
Covington
Amber
A
Krumpe
Michael S
MS
Pfeifer
Angela
A
Truitt
Hyun Jin
HJ
Yoo
Heather E
HE
Rudisill
Timothy C
TC
Hain
D000161:Acoustic Stimulation; D000328:Adult; D001132:Arm / Q000502:physiology; D004576:Electromyography / Q000379:methods; D005072:Evoked Potentials, Auditory; D005260:Female; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D011446:Prospective Studies; D013016:Sound