The effect of the interaction between asymmetric mouvement and muscular coactivation on lumbar loading in healthy subjects and subjects with lumbar back pain - Phase 1 Abstract Lumbar loading resulting in damage to intervertebral discs is exacerbated by certain combinations of trunk movements, such as bending and leaning, which are common components of many tasks. Because most currently available models are static and two-dimensional, they are ill-suited to the study of those movements, which are three-dimensional. This project developed a three-dimensional model that evaluates the force exerted on intervertebral discs, taking into account of the level of muscle activation, and validated it through laboratory simulations of materials handling. Muscle coactivation was observed regardless of the specific task performed, was related to the nature of the movement performed, and resulted in higher-than-predicted disk forces. The model could help identify and understand the behaviour of biomechanical variables associated with the risk of back injuries. Produced Under this Project Scientific Reports The effect of the interaction between asymmetric movement and muscle coactivationon spinal loading in healthy individuals and patients suffering from low back pain - Phase 1 : Development and validation of a physiologically optimal model of joint biomechanics Research Report: R-198 Scientific Publications Comparative ability of EMG, optimization, and hybrid modelling approaches to predict muscle forces and lumbar spine loading during dynamic saggital plane liftingGagnon D., Christian Larivière, Loisel P.Source : Clinical Biomechanics, vol. 16, no 5, 2001, p. 359-372A biomechanical comparison of lifting techniques between subjects with and without chronic low back pain during freestyle lifting and lowering tasksChristian Larivière, Gagnon D., Loisel P.Source : Clinical Biomechanics, vol. 17, no 2, 2002, p. 89-98The influence of trunk modelling in 3D biomechanical analysis of simple and complex lifting tasksChristian Larivière, Gagnon D.Source : Clinical Biomechanics, 1999, vol. 14, no 7, p. 449-461The L5/S1 joint moment sensitivity to measurement errors in dynamic 3D multisegment lifting modelsChristian Larivière, Gagnon D.Source : Human Movement Science, 1999, vol. 18, no 4, p. 573-587The comparison of trunk muscle EMG activation between subjects with and without chronic low back pain during flexion-extension and lateral bending tasks. Christian Larivière, Gagnon D., Loisel P.Source : Journal of Electromyography and Kinesiology, 2000, vol. 10, no 2, p. 79-91The effect of load on the coordination of the trunk segments of subjects with and without chronic low back pain during flexion-extension and lateral bending tasksChristian Larivière, Gagnon D., Loisel P.Source : Clinical Biomechanics, 2000, vol. 15, no 6, p. 407-416An application of pattern recognition for the comparison of trunk muscles EMG waveforms between subjects with and without chronic low back pain during flexion-extension and lateral bending tasksChristian Larivière, Gagnon D., Loisel P.Source : Journal of Electromyography and Kinesiology, 2000, vol. 10, no 4, p. 261-273The influence of trunk modelling in 3D biomechanical analysis of simple and complex lifting tasksChristian Larivière, Gagnon D.Source : in 12th Congress of the International Society of Electrophysiology and Kinesiology / ISEK 1998 (12th : June 27-30, 1998 : Montréal, Canada), A.B. Arsenault, P. McKinley & B. McFadyen (eds), 1998, p. 246-247Using optimization and EMG-assisted optimization lumbar spine models to contrast trunk muscle strategiesGagnon D., Christian Larivière, Ghorbal A., Loisel P.Source : in Proceedings of NACOB'98 the third North American Congress on Biomechanics (3rd : August 14-18, 1998 : Waterloo, Canada), 1998, p. 369-370The importance of a physiologically-assisted modelling approach to assess trunk muscle coactivation and dynamic spinal loadsGagnon D., Christian Larivière, Loisel P.Source : in International Society of Biomechanics (17th : August 8-13, 1999 : Calgary, Canada), 1999, p. 649The effect of load on the coordination of the trunk for subjects with and without chronic low back pain during flexion-extension & lateral bending tasksChristian Larivière, Gagnon D., Loisel P.Source : in International Society of Biomechanics (17th : August 8-13, 1999 : Calgary, Canada), 1999, p. 900Trunk modelling procedures and errors in net lumbar loadingGagnon D., Christian LarivièreSource : in Proceedings of the XIVth Triennal Congress of the International Ergonomics Association and 44th Annual Meeting of the Human Factors and Ergonomics Society (San Diego, California, USA), 2000, vol. 4, p. 605-608 Additional Information Type: Project Number: 0092-0300 Status: Completed Year of completion: 1998 Research Field: Occupational Rehabilitation Team: Denis Gagnon (Université de Sherbrooke)Patrick Loisel (Université de Sherbrooke)