Which of the following factor determines the amplitude of EMG signal?(a) Respiration(b) Ventricular Volume(c) Blood Resistivity(d) Position of electrodeI had been asked this question in examination.This interesting question is from Multi-Channel Wireless Telemetry System topic in chapter Biomedical Telemetry of Biomedical Instrumentation

Which of the following factor determines the amplitude of EMG signal?(

1.	Which of the following factor determines the amplitude of EMG signal?(a) Respiration(b) Ventricular Volume(c) Blood Resistivity(d) Position of electrodeI had been asked this question in examination.This interesting question is from Multi-Channel Wireless Telemetry System topic in chapter Biomedical Telemetry of Biomedical Instrumentation
Answer» Correct choice is (d) Position of electrode Best explanation: The amplitude of the EMG signals DEPENDS upon VARIOUS factors, e.g. the type and placement of electrodes USED and the degree of muscular exertions. The needle electrode in contact with a single muscle fibre will pick up spike type voltages whereas a surface electrode picks up many overlapping spikes and THEREFORE produces an average VOLTAGE effect.

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