An inverse dynamic analysis on the influence of upper limb gravity compensation during reaching

J. M.N.Hans Essers, Kenneth Meijer, Alessio Murgia, Arjen Bergsma, Paul Verstegen

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    1 Citation (Scopus)

    Abstract

    Muscular dystrophies (MDs) are characterized by progressive muscle wasting and weakness. Several studies have been conducted to investigate the influence of arm supports in an attempt to restore arm function. Lowering the load allows the user to employ the residual muscle force for movement as well as for posture stabilization. In this pilot study three conditions were investigated during a reaching task performed by three healthy subjects and three MD subjects: a control condition involving reaching; a similar movement with gravity compensation using braces to support the forearm; an identical reaching movement in simulated zero-gravity. In the control condition the highest values of shoulder moments were present, with a maximum of about 6 Nm for shoulder flexion and abduction. In the gravity compensation and zero gravity conditions the maximum shoulder moments were decreased by more than 70% and instead of increasing during reaching, they remained almost unvaried, fluctuating around an offset value less than 1 Nm. Similarly, the elbow moments in the control condition were the highest with a peak around 3.3 Nm for elbow flexion, while the moments were substantially reduced in the remaining two conditions, fluctuating around offset values between 0 to 0.5 Nm. In conclusion, gravity compensation by lower arm support is effective in healthy subjects and MD subjects and lowers the amount of shoulder and elbow moments by an amount comparable to a zero gravity environment. However the influence of gravity compensation still needs to be investigated on more people with MDs in order to quantify any beneficial effect on this population.

    Original languageEnglish
    Title of host publication2013 IEEE 13th International Conference on Rehabilitation Robotics, ICORR 2013
    ISBN (Electronic)9781467360241
    DOIs
    Publication statusPublished - 31 Dec 2013
    EventIEEE 13th International Conference on Rehabilitation Robotics, ICORR 2013: Design and Control of Robotic Exoskeletons with Compliant Joints and Actuation Systems - University of Washington , Seattle, United States
    Duration: 24 Jun 201326 Jun 2013
    Conference number: 13
    https://depts.washington.edu/uwconf/icorr2013/

    Conference

    ConferenceIEEE 13th International Conference on Rehabilitation Robotics, ICORR 2013
    Abbreviated titleICORR
    CountryUnited States
    CitySeattle
    Period24/06/1326/06/13
    Internet address

    Keywords

    • gravity compensation
    • inverse dynamics
    • joint moments
    • lower arm support
    • zero gravity environment

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  • Cite this

    Essers, J. M. N. H., Meijer, K., Murgia, A., Bergsma, A., & Verstegen, P. (2013). An inverse dynamic analysis on the influence of upper limb gravity compensation during reaching. In 2013 IEEE 13th International Conference on Rehabilitation Robotics, ICORR 2013 [6650368] https://doi.org/10.1109/ICORR.2013.6650368