Development and testing of a moment-based coactivation index to assess complex dynamic tasks for the lumbar spine

Clinical Biomechanics
Peter LeWilliam S Marras

Abstract

Many methods exist to describe coactivation between muscles. However, most methods have limited capability in the assessment of coactivation during complex dynamic tasks for multi-muscle systems such as the lumbar spine. The ability to assess coactivation is important for the understanding of neuromuscular inefficiency. In the context of this manuscript, inefficiency is defined as the effort or level of coactivation beyond what may be necessary to accomplish a task (e.g., muscle guarding during postural stabilization). The objectives of this study were to describe the development of an index to assess coactivity for the lumbar spine and test its ability to differentiate between various complex dynamic tasks. The development of the coactivation index involved the continuous agonist/antagonist classification of moment contributions for the power-producing muscles of the torso. Different tasks were employed to test the range of the index including lifting, pushing, and Valsalva. The index appeared to be sensitive to conditions where higher coactivation would be expected. These conditions of higher coactivation included tasks involving higher degrees of control. Precision placement tasks required about 20% more coactivation than ta...Continue Reading

Citations

Sep 16, 2018·International Journal of Environmental Research and Public Health·Ranavolo AlbertoSergio Iavicoli
Nov 13, 2020·Frontiers in Bioengineering and Biotechnology·Xiao HuSilvia S Blemker
Nov 30, 2021·Computer Methods in Biomechanics and Biomedical Engineering·Farshid GhezelbashAboulfazl Shirazi-Adl

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