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Upper and lower extremity EMG correlations during normal human gait.

P L Weiss, D St Pierre

    Archives of Physical Medicine and Rehabilitation
    |January 1, 1983
    PubMed
    Summary

    Researchers investigated diagonal intersegmental interactions during human gait using electromyography (EMG). While not consistently synchronized, some upper limb muscles showed simultaneous activity with the tibialis anterior (TA), suggesting potential gait control applications.

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    Area of Science:

    • Biomechanics
    • Neuroscience
    • Human Movement Science

    Background:

    • Understanding intersegmental dynamics in human gait is crucial for developing advanced rehabilitation strategies.
    • Functional electrical stimulation (FES) holds promise for restoring gait in individuals with lower extremity paralysis.
    • Electromyographic (EMG) signals offer a potential control mechanism for FES during locomotion.

    Purpose of the Study:

    • To investigate the presence and nature of diagonal intersegmental interactions during normal human walking.
    • To assess the feasibility of using EMG signals from upper limb muscles to control FES for paralyzed lower extremity muscles during gait.

    Main Methods:

    • Surface electromyography (EMG) was used to monitor the activity of upper extremity muscles and the tibialis anterior (TA) in 8 healthy women.

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  • Data analysis focused on the phasing and synchronicity of EMG signals between upper and lower limb muscles during gait.

    • Main Results:

    • Significant variability in the frequency and duration of EMG activity was observed in all monitored upper extremity muscles.
    • No single upper extremity muscle consistently exhibited synchronous phasing with the tibialis anterior (TA) across all subjects.
    • However, a majority of subjects (6 out of 8) showed at least one upper extremity muscle active concurrently with the TA.

    Conclusions:

    • Diagonal intersegmental interactions during gait may exist but are not consistently synchronized across all individuals or muscle groups.
    • Variability in upper limb kinematics might obscure the detection of these intersegmental interactions.
    • Further research is needed to refine EMG-based control strategies for FES in gait rehabilitation, potentially accounting for kinematic differences.