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Assessment of Active and Passive Restraint During Guided Reaching After Chronic Brain Injury

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Abstract

We report the use of a mechatronic device for assessing arm movement impairment after chronic brain injury. The device, called the “Assisted Rehabilitation and Measurement Guide,” is designed to guide reaching movements across the workspace, to measure movement and force generation, and to apply controlled forces to the arm along linear reaching paths. We performed a series of experiments using the device in order to identify the contribution of active muscle and passive tissue restraint to decreased active range of motion of guided reaching (i.e., “workspace deficits”) in a group of five chronic, spastic hemiparetic, brain-injured subjects. Our findings were that passive tissue restraint was increased in the spastic arms, as compared to the contralateral, nonparetic arms. Active muscle restraint, on the other hand, was typically comparable in the two arms, as quantified by measurements of active arm stiffness at the workspace boundary during reaching. In all subjects, there was evidence of movement-generated weakness, consistent with a small contribution of spasticity to workspace deficits. These results demonstrate the feasibility of mechatronic assessment of the causes of decreased functional movement, and could provide a basis for enhanced treatment planning and monitoring following brain injury. © 1999 Biomedical Engineering Society.

PAC99: 8719La, 8719St, 8780Vt, 8719Nn, 8719Ff

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, and Program in Biomedical Engineering, University of California, Irvine, CA

    David J. Reinkensmeyer

  2. Department of Physical Medicine and Rehabilitation, Northwestern University Medical School, and Sensory Motor Performance Program, Rehabilitation Institute of Chicago, Chicago, IL

    David J. Reinkensmeyer, Brian D. Schmit & William Z. Rymer

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  1. David J. Reinkensmeyer
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  2. Brian D. Schmit
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  3. William Z. Rymer
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Reinkensmeyer, D.J., Schmit, B.D. & Rymer, W.Z. Assessment of Active and Passive Restraint During Guided Reaching After Chronic Brain Injury. Annals of Biomedical Engineering 27, 805–814 (1999). https://doi.org/10.1114/1.233

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