Describe concentric and eccentric activity. Note that the context here is that a "kinesiological EMG" is a mix of both of these activities.
Mix of concentric & eccentric activity
úConcentric activity occurs in brief bursts – Power generation
Starts the limb’s momentum going forward and then it turns off to save energy
úEccentric muscle activity is very energy efficient – Power absorption
What type (fast twitch or slow twitch) of muscle would you expect to be contracting eccentrically?
* Note: In understanding muscle in regard to movement, activity will always lead the joint being moved