#Muscle twitch skin#

#Muscle twitch skin#

To reduce electrode movement, use adhesive tape to attach theĬables to the skin close to the electrode. Place the electrodes on the skin over the crosses so they adhere Snap the cables from CH1 on the Bio Amp cable onto the electrodes. Trimmed slightly so they will fit on smaller hands. Lightly abrade the marked skin to reduce its electrical resistance. Minimi muscle where the recording electrodes will be placed,Īs shown in the figure. Mark 2 small crosses on the skin over the abductor digiti Space to place the stimulating bar electrode at the wrist. Wrap the dry earth strap around the volunteer's wrist. Remove any jewelry from the volunteer's wrists.

The elbow or wrist, and record muscle activity (compound muscleĪction potential) and abductor digiti minimi. In these activities, students will stimulate the ulnar nerve at Use these marks to reposition the stimulating bar electrode at theĮlbow for EMG recordings in the following activities. Indicating the position of the electrode that produces the most With a ballpoint pen, lightly mark two small crosses on the skin

When a good response is achieved select Stop on the device.

Of the electrodes, and locate the position which produces the largest Examine the effect of small adjustments in the position Take note of the twitch contractions affecting the little finger and If you cannot achieve a response, increase the stimulator current by 2

Select Start, and a short pulse current will pass through the Switched off internally at all other times.

Isolated Stimulator only becomes active during a recording. On a PowerLab, the Isolated Stimulator switch should be set to the ON position. Set the current to 8 milliamperes (mA) in the Isolated Stimulator panel (if using a PowerLab). The approximate position is shown in the diagram, above.Īpply pressure to the stimulating bar electrode to ensure the electrode Place the stimulating bar electrode over the volunteer's ulnar nerve at Place a small amount of electrode paste on the 2 metal pads of the Electrode placement for ulnar nerve stimulation at the elbow.