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

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

(a) Respiration

(b) Ventricular Volume

(c) Blood Resistivity

(d) Position of electrode

I 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

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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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