Evaluation of intuitive trunk and non-intuitive leg sEMG control interfaces as command input for a 2-D Fitts’s law style task

S. Verros (Corresponding Author), Koen Lucassen, E.E.G. Hekman, A. Bergsma, G.J. Verkerke, H.F.J.M. Koopman

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    Abstract

    Duchenne muscular dystrophy (DMD) is a muscular condition that leads to muscle loss. Orthotic devices may present a solution for people with DMD to perform activities of daily living (ADL). One such device is the active trunk support but it needs a control interface to identify the user’s intention. Myoelectric control interfaces can be used to detect the user’s intention and consequently control an active trunk support. Current research on the control of orthotic devices that use surface electromyography (sEMG) signals as control inputs, focuses mainly on muscles that are directly linked to the movement being performed (intuitive control). However in some cases, it is hard to detect a proper sEMG signal (e.g., when there is significant amount of fat), which can result in poor control performance. A way to overcome this problem might be the introduction of other, non-intuitive forms of control. This paper presents an explorative study on the comparison and learning behavior of two different control interfaces, one using sEMG of trunk muscles (intuitive) and one using sEMG of leg muscles that can be potentially used for an active trunk support (non-intuitive). Six healthy subjects undertook a 2-D Fitts’s law style task. They were asked to steer a cursor into targets that were radially distributed symmetrically in five directions. The results show that the subjects were generally able to learn to control the tasks using either of the control interfaces and improve their performance over time. Comparison of both control interfaces demonstrated that the subjects were able to learn the leg control interface task faster than the trunk control interface task. Moreover, the performance on the diagonal-targets was significantly lower compared to the one directional-targets for both control interfaces. Overall, the results show that the subjects were able to control a non-intuitive control interface with high performance. Moreover, the results indicate that the non-intuitive control may be a viable solution for controlling an active trunk support.
    Original languageEnglish
    Article numbere0214645
    JournalPLoS ONE
    DOIs
    Publication statusPublished - 3 Apr 2019

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    Electromyography
    electromyography
    Leg
    legs
    Orthotic Devices
    Muscles
    muscles
    muscular dystrophy
    Duchenne Muscular Dystrophy
    Activities of Daily Living
    Healthy Volunteers
    learning
    Muscle
    Fats
    Learning
    Orthotics
    Equipment and Supplies
    lipids
    Research

    Cite this

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    title = "Evaluation of intuitive trunk and non-intuitive leg sEMG control interfaces as command input for a 2-D Fitts’s law style task",
    abstract = "Duchenne muscular dystrophy (DMD) is a muscular condition that leads to muscle loss. Orthotic devices may present a solution for people with DMD to perform activities of daily living (ADL). One such device is the active trunk support but it needs a control interface to identify the user’s intention. Myoelectric control interfaces can be used to detect the user’s intention and consequently control an active trunk support. Current research on the control of orthotic devices that use surface electromyography (sEMG) signals as control inputs, focuses mainly on muscles that are directly linked to the movement being performed (intuitive control). However in some cases, it is hard to detect a proper sEMG signal (e.g., when there is significant amount of fat), which can result in poor control performance. A way to overcome this problem might be the introduction of other, non-intuitive forms of control. This paper presents an explorative study on the comparison and learning behavior of two different control interfaces, one using sEMG of trunk muscles (intuitive) and one using sEMG of leg muscles that can be potentially used for an active trunk support (non-intuitive). Six healthy subjects undertook a 2-D Fitts’s law style task. They were asked to steer a cursor into targets that were radially distributed symmetrically in five directions. The results show that the subjects were generally able to learn to control the tasks using either of the control interfaces and improve their performance over time. Comparison of both control interfaces demonstrated that the subjects were able to learn the leg control interface task faster than the trunk control interface task. Moreover, the performance on the diagonal-targets was significantly lower compared to the one directional-targets for both control interfaces. Overall, the results show that the subjects were able to control a non-intuitive control interface with high performance. Moreover, the results indicate that the non-intuitive control may be a viable solution for controlling an active trunk support.",
    author = "S. Verros and Koen Lucassen and E.E.G. Hekman and A. Bergsma and G.J. Verkerke and H.F.J.M. Koopman",
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    AU - Verros, S.

    AU - Lucassen, Koen

    AU - Hekman, E.E.G.

    AU - Bergsma, A.

    AU - Verkerke, G.J.

    AU - Koopman, H.F.J.M.

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    SN - 1932-6203

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