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The amplitude of EMG signals depend upon which of the following factor?

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The amplitude of EMG signals depend upon which of the following factor?

(a) Respiration

(b) Position of electrode

(c) Blood Resistivity

(d) Ventricular Volume

This question was posed to me during an online interview.

Question is taken from Measurement of Respiration Rate in chapter Patient Monitoring System of Biomedical Instrumentation

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Correct option is (b) Position of electrode

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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