Dynamic EMG processing in describing muscle activities during isokinetics

A dynamic EMG (electromyography) processing method combined with a biomechanical model is used to describe the muscle activities during isokinetics. This new approach transfers the EMG signals into two components to depict the spatial summation and the temporal summation separately. Good correlation between the EMG and muscle force predicted from a biomechanical model is obtained. In low-speed isokinetic movement, the muscle strength change is dominated by the change in the number of fibers (spatial summation variation). However, in high-speed isokinetic movement, the muscle strength change is contributed by both the spatial summation variation and the frequency change of the nerve impulses in each fiber (temporal summation variation)