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A surface electromyogram (EMG), especially when recorded near the neuromuscular junction, is expected to contain the endplate potential (EPP) component which can be extracted with an appropriate signal filter. Two factors are important: the EMG must be recorded in monopolar fashion, and the recording must be done so the low frequency signal corresponding the EPP is not eliminated. This report explains how to extract the EPP component from the EMG of the masseter muscle in a human subject. The surface EMG is recorded from eight sites using traditional disc electrodes aligned along over the muscle, with equal inter-electrode distance from the zygomatic arch to the angle of mandible in response to quick gum clenching. A reference electrode is placed on the tip of the nose. The EPP component is extracted from the raw EMGs by applying a high-cut digital filter (2nd dimension Butterworth filter) with a range of 10-35 Hz. When the filter is set to 10 Hz, the extracted EPP wave deflects either negative or positive depending on the recording site. The difference in the polarity reflects the sink-source relation of the end plate current, with the site showing the most negative deflection corresponding to the neuromuscular junction. In the case of the masseter muscle, the neuromuscular junction is estimated to be located in the inferior portion close to the angle of mandible. The EPP component exhibits an interesting oscillation when the cut-off frequency of the high-cut digital filter is set to 30 Hz. The EPP oscillation indicates that muscle contraction is adjusted in an intermittent manner. Abnormal tremors accompanying various sorts of diseases may be substantially due to this EPP oscillation, which becomes slower and is difficult to cease.
To study the antiglycating, antidiabetic and antioxidant properties of Aegle marmelos Correa leaf extract and identify the bioactive constituent.
The effect of the chloroform extract of Aegle marmelos Correa was studied in streptozotocin-induced diabetic rats thro...
Sea surface height anomalies observed by satellites in 1993--2012 are
combined with simulation and observations by surface drifters and Argo floats
to study water flow pattern in the Near Strait (NS) connected the Pacific Ocean
with the Bering Sea. Daily Lagrangian latitudinal maps, computed with t...
We have revisited Cooper's one pair problem of calculating the binding energy
For two electrons, experiencing an attractive interaction near the Fermi
Surface, in case of quasi one dimensional lattice system. Though it is a
Generalized formalism, we have chosen two materials viz., (TMTSF)2ClO4 and
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