3D Motion Capture and Electromyography
Optically-based 3D motion capture systems use reflective markers attached to key anatomical features on the subject of interest. The reflective markers are tracked by multiple video cameras and (after proper calibration of the camera positions, camera lens distortion, subject's anatomical features, etc.) highly specialized software automatically calculates the 3D positions of the markers using the techniques of triangulation. The marker positions are then used to estimate the skeletal kinematics (joint centers and axes of rotation) of the subject wearing the markers.
Surface electromyography (SEMG) is widely applied to characterize the time phasing of muscle activity. Electrodes attached to the surface of the skin over the muscle(s) of interest enable measurement of the electrical activity associated with muscle contractions. The electrical signals typically document the activity or inactivity of muscles over time as well as the relative degree of activity compared to a previously determined standard (e.g., an isometric maximum voluntary contraction).
Auburn University's new 6 camera motion capture system from Motion Reality Inc, (Atlanta, GA) and 8 channel wireless EMG system from Noraxon Inc. (Scottsdale, AZ) are currently being used in biomechanical engineering studies of precision motor skills, balance and force generation during complex motion. For example:
Development of experimentally validated computational models of skeletal kinematics (joint centers, axes of rotation, velocities and accelerations), reflex activity and musculoskeletal stresses and strains during controlled falls. Use of the verified models to investigate injury potential during uncontrolled falls. This research has the potential to contribute to the development of new designs of living and workplace accommodations with reduced injury potential from falls.
Neuromuscular studies of induced reflex activity and muscle inhibitions through controlled stimulations of select peripheral nerves. This work may contribute to new less-lethal control and restraint technologies for homeland defense and professional security applications.
Personal research into comparative studies of the biomechanical similarities of complex techniques of the striking arts of karate/Tae Kwon Do with the grappling arts of hapkido/jujitsu/aikido. More info can be found by clicking here.