Mean Power Frequency

Mean power frequency is a single-number summary of a signal's frequency content, computed as the power-spectrum-weighted mean of frequency. In surface-EMG-based accessibility input devices, MPF of each electrode channel is used to discriminate between contractions of nearby muscles whose signals bleed into the same electrodes, because different muscles produce EMG with different characteristic frequency profiles. MPF is also widely used in clinical EMG as a fatigue indicator, because sustained muscle contractions shift the EMG spectrum toward lower frequencies.