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Radial nerve F-wave reference values with surface electrodes from the anconeus muscle
Full text linkINTRODUCTION: We aimed to obtain normative values for radial nerve F-wave parameters, recording with surface electrodes from the anconeus muscle. METHODS: We tested 30 healthy subjects (17 females, 13 males) and measured the following parameters: number of F-waves/40 traces (F%), minimum, maximum and mean F-wave latency (FMIN, FMAX, FMED), F-wave chronodispersion (FCHR), inter-side difference of F% and FMIN (DF%, DFMIN). RESULTS: The mean F% was 41.3%; the normative values of FMIN, FMED, FMAX and FCHR were <21.2 ms, <22.1 ms, <23.3 ms and <4.0 ms, respectively, and those of DF% and DFMIN were <16.6% and <1.1 ms. Height was the sole independent predictor in a regression model of FMIN, FMED, and FMAX, explaining 37% to 44% of the variability. DISCUSSION: we identified a feasible and useful technique to record radial nerve F-waves from the anconeus muscle and obtained normative values of F-wave parameters. This article is protected by copyright. All rights reserved
Magnetic motor evoked potentials (MEPs) in masseter muscles. Elec¬tro¬myo¬gr. Clin. Neuro¬physiol. 1991;31:303-309.
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Trigemino-facial reflex inhibitory responses in some lower facial muscles.
No full textThe effects of electrical trigeminal stimulation on activated facial muscles were studied in 20 normal subjects in order to evaluate whether excitatory or inhibitory responses are present and to investigate whether the reflex organization is similar in all the facial muscles. No inhibition was observed in frontalis, orbicularis oculi, orbicularis oris, and mentalis muscles. By contrast, a clear suppression of electromyographic (EMG) activity (late silent period or SP2) was present in the levator labii superioris, depressor anguli oris, and depressor labii inferioris muscles, with a mean latency ranging from 41.8 to 50.2 ms, and a mean duration ranging from 27.5 to 40.9 ms. An early suppression of EMG activity (early silent period or SP1) was observed, with a latency of 16 to 20 ms and a duration of 10 ms, mainly in inferior perioral muscles. Our findings show a selective trigeminal inhibitory influence upon some specific lower facial muscles
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