Explain 2 reasons to normalize emg data

1. Why do you normalize EMG data?
2. Why do we normalize a signal?
3. How is EMG activity measured?
4. Why is integrated EMG used?

Why do you normalize EMG data?

To allow comparison of activity between different muscles, across time, and between individuals, the EMG signal should be normalized, i.e. expressed in relation to a reference value obtained during standardized and reproducible conditions.

Why do we normalize a signal?

Normalizing the amplitude of a signal is to change the amplitude to meet a particular criterion. One type of normalization is to change the amplitude such that the signal's peak magnitude equals a specified level.

How is EMG activity measured?

During the test, one or more small needles (also called electrodes) are inserted through the skin into the muscle. The electrical activity picked up by the electrodes is then displayed on an oscilloscope (a monitor that displays electrical activity in the form of waves).

Why is integrated EMG used?

Integrated EMG (IEMG) is generally used as a pre-activation index for muscle activity. It is the area under the curve of the rectified EMG signal. IEMG can be simplified and expressed as the summation of the absolute values of the EMG amplitude [7].