title: Concentric needle jitter in stimulated frontalis in 20 healthy subjects.
abstract: Normative data for jitter parameters using a disposable concentric needle have been presented in a few studies. Jitter, expressed as the mean consecutive difference (MCD), was measured in the frontalis muscle in 20 subjects by percutaneous bar stimulation of the temporal nerve branch. The mean MCD for individual studies (20) and for all potentials (600) were 16.05 ± 2.73 μs and 16.05 ± 5.96 μs, respectively. The suggested limit for mean MCD is 22 μs and for outliers is 28 μs.
authors.affiliation: Department of Neurological Sciences, Neuromuscular Investigation Laboratory, Faculdade de Medicina de São José do Rio Preto (FAMERP), São Paulo, Brazil. jaris@terra.com.br
authors.forename: João A
authors.initials: JA
authors.lastname: Kouyoumdjian
authors.forename: Erik V
authors.initials: EV
authors.lastname: Stålberg
mesh_terms: D000328:Adult; D001703:Biophysics; D004558:Electric Stimulation / Q000379:methods; D004576:Electromyography; D005152:Facial Muscles / Q000502:physiology*; D005260:Female; D006257:Head / Q000294:innervation*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009119:Muscle Contraction / Q000502:physiology*; D009339:Needles; D011446:Prospective Studies; D013997:Time Factors; D055815:Young Adult