EMG Onset

Here is an example to try to find the onset of EMG in electromechanical delay:

The definition of electromechanical delay here is the time delay between the M wave which

is stimulated by ES and the onset of force.

Finding force onset is pretty easy. I just found the point which is double standard deviation of

the baseline force.

However, finding M wave onset is a little bit difficult. I made two definition to find the onset 

point. One is the location of point should be in front of the location of Max peak and Min peak of M wave.

The other is the point should be zero after differential.