Surface electromyographic (SEMG) amplitude signals can often contain rhythmic spikes due to cardiogenic electrical activity. The author discusses the impact of this activity on SEMG biofeedback training and techniques to reduce the problems caused by cardiogenic electrical activity. In particular, changing the low frequency cutoff of the digital filter settings to reduce cardiogenic electrical activity is recommended as a procedure to improve the fidelity of SEMG amplitude signals.

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