Surface electromyography and kinetics during step descent in individuals with low-level chronic or recurrent low back pain and lumbar instability

Background: Most biomechanical studies in populations with low back pain have examined level gait or stationary tasks. This study investigates step negotiation a subgroup of individuals pain. Methods: Surface electromyography and kinetic data were collected 22 subjects. Results: Vertical ground reaction force rise-time was slower participants when leading the left leg they had delayed muscle onsets right gluteus medius, rectus abdominis stepping, lumbar erector spinae stepping but earlier onset stepping. EMG activations higher spinae, medius both steps. Conclusion: The results this show that activity levels, onsets, weight acceptance.