When a raw EMG is processed to derive the Average Rectified EMG value (ARV), what effect does increasing the length of the time window over which the signal is 'averaged' (e.g. from 50 ms to 100 ms) have on the final processed EMG?

Question

Quizplus · Accepted Answer

Selection of short duration window widths (e.g. 10-50 ms) in the ARV calculation may allow the detection of rapid alterations in activity, but the resulting curve will still resemble the rectified EMG. Adoption of longer widths (e.g. 100-200 ms) will reduce the variability of peak amplitudes, but the resulting curve will lose the trend of the underlying EMG.

When a Raw EMG Is Processed to Derive the Average