A relationship between external work and internal energy during knee flexion/extension

The work/energy approach towards the analysis of human motion has wide ranging applications in both clinical and sports biomechanics. The present study aims at relating the external work done to the total energy in the EMG signal. The EMG activity from the major flexor and extensor muscles of the knee joint were measured. The external work done during extension/flexion movements at four speeds were computed. Preliminary results indicate that there exists a relationship between the external work done and the energy in the EMG signal.