Increased range of motion and decreased muscle activity during maximal reach with gravity compensation in stroke patients

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    To stimulate restoration of arm function after stroke, active movement is important, which can be facilitated by supporting the weight of the hemiparetic arm, either in conventional treatment or in other approaches such as robot-aided therapy. During arm support, the active range of motion during reach can increase with respect to unsupported movements. The present objective was to investigate the influence of gravity compensation on muscle activity and range of motion during maximal reach. Six stroke patients performed maximal reaching movements, once with and once without gravity compensation. When comparing these two conditions, muscle activity decreased while range of motion increased with gravity compensation. This implies that gravity compensation may facilitate active arm movements, by reducing the required muscle activity to maintain a particular arm orientation. This may be related to a reduction of an abnormal coupling between shoulder abduction and elbow flexion when arm movements are performed with gravity compensation.
    Original languageUndefined
    Title of host publicationIEEE 10th International Conference on Rehabilitation Robotics (ICORR 2007)
    EditorsJust L. Herder G.J. Gelderblom Bart Driessen
    Place of PublicationPiscataway, NJ 08855-1331
    PublisherIEEE Service Center, P.O. Box 1331, +1 800 678 IEEE (+1 800 678 4333) +1 732 981 1393 + 1 732 981 9667 (FAX)
    Number of pages5
    ISBN (Print)978-1-4244-1319-5
    Publication statusPublished - 13 Jun 2007
    EventIEEE 10th International Conference on Rehabilitations Robotics, ICORR 2007: Robots care! - Noordwijk, Netherlands
    Duration: 13 Jun 200715 Jun 2007
    Conference number: 10

    Publication series



    ConferenceIEEE 10th International Conference on Rehabilitations Robotics, ICORR 2007
    Abbreviated titleICORR


    • METIS-240493
    • Stroke patients
    • elbow flexion
    • Muscle activity
    • Arm function
    • IR-76475
    • gravity compensation
    • EWI-19870
    • robot-aided therapy
    • shoulder abduction
    • hemiparetic arm
    • maximal reaching movements
    • BSS-Biomechatronics and rehabilitation technology

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