Quantification

The are numerous methods for quantifying electrical signals from muscles. Below is a diagram from David Winter's book Biomechanics and Motor Control of Human Movement, 2nd edition, that displays the more typical processing systems. The top row presents the raw, unprocessed data. A first stage is to rectify the biphasic sigal, that is, to make the signal all positive, as shown on the second row. Once that has been done you can use a low-pass filter (page 43 in Enoka) to create the "linear envelope", the third row, integrate over the complete cycle, the fourth row, or integrate to some preset time or voltage.

Click on each row to see a specific example or select from the items on the left.