What would happen if you remove the black (reference) electrode from the circuit? Since you are measuring the difference between the two electrodes. You can use circuit ground as reference so why even include the third electrode in the circuit?
The black and red go into a difference amplifier, while the ground lead is used to help pull electrical interference, particularly 60/50 Hz from main supply, off the body to decrease interference into the recording system. The ground can also can decrease stimulation artifact, so best to place the ground between stimulating and recording electrodes.
When the nervous system stimulates the muscle cells, those muscle cells undergo action potentials (their membrane charge flips from positive to negative repeatedly). It is those action potentials that the muscle cells are undergoing, as part of the signal for their contraction, that the EMG machine is picking up. It is that the charge of action potentials going quickly from negative to positive and back again and repeating as long as the cells are stimulated, that is what causes the EMG signals to go up and down symmetrically.
Thanks Again Dr. Hartung ! Your videos always clarify my confusions . Thank you so much for your kindness. Keep doing great things !
Thanks for keeping up on the videos Dr. Ren! I always find them very informative 👌!
How to straighten an EMG curvy baseline, please? I have a green and a red electrode I place on the patient along with a concentric needle
Thank you for this video. It is possible to save this data for flexion and extension of the forarm?.
tKS, that´s so cool
Why u gate keeping bro? Inform us
What would happen if you remove the black (reference) electrode from the circuit? Since you are measuring the difference between the two electrodes. You can use circuit ground as reference so why even include the third electrode in the circuit?
The black and red go into a difference amplifier, while the ground lead is used to help pull electrical interference, particularly 60/50 Hz from main supply, off the body to decrease interference into the recording system. The ground can also can decrease stimulation artifact, so best to place the ground between stimulating and recording electrodes.
@@kennethklettke832 thanks, It had me confused for a long time
Why the EMG signal symmetrically bounds over and under zero?
When the nervous system stimulates the muscle cells, those muscle cells undergo action potentials (their membrane charge flips from positive to negative repeatedly). It is those action potentials that the muscle cells are undergoing, as part of the signal for their contraction, that the EMG machine is picking up. It is that the charge of action potentials going quickly from negative to positive and back again and repeating as long as the cells are stimulated, that is what causes the EMG signals to go up and down symmetrically.