Giving Santos™ Fatigue: Muscle Fatigue
To generate a required force, the brain will send electrical pulses to the motor units more and more rapidly until sufficient force is generated.
With the aid of the mathematical model for force and fatigue prediction, motion and posture for humans can be predicted. This mathematical model works for anaerobic fatigue, and work is presently ongoing to include aerobic and psychological fatigue. Anaerobic fatigue effects in a weight lifter performing a leg extension exercise illustrates how the mathematical model is applied to predict the motion and fatigue of a digital human.
In order to model fatigue, the physiological processes responsible for the generation of force and, eventually, fatigue are written into five coupled differential equations and an algebraic equation. Solving these equations results in the calcium-time history and force-time history of the muscle.
