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Related Experiment Videos

[Immediate and remote postactivation effects in the human motor system].

V S Gurfinkel', Iu S Levik, M A Lebedev

    Neirofiziologiia = Neurophysiology
    |January 1, 1989
    PubMed
    Summary

    Postactivation effects, a sustained muscle contraction, can extend from distal to proximal muscles. These effects, including concealed changes, offer insights into postural mechanisms.

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    Fiziologiia cheloveka·2015

    Area of Science:

    • Neuroscience
    • Human Physiology
    • Motor Control

    Background:

    • Postactivation effects are characterized by sustained non-voluntary muscle contractions following voluntary effort.
    • These effects are typically observed in the muscles directly involved in the voluntary activity.

    Purpose of the Study:

    • To investigate the occurrence of postactivation effects in proximal muscles after distal muscle contraction.
    • To identify and characterize delayed or concealed changes in motor system excitability using muscle tendon vibration.
    • To explore the potential of postactivation phenomena in understanding postural control mechanisms.

    Main Methods:

    • Sustained voluntary contraction of distal muscles.
    • Assessment of postactivation effects in both distal and proximal muscles.
    • Muscle tendon vibration testing to evaluate motor system excitability.
    • Monitoring of immediate and delayed (15-20 min) changes in muscle activity.

    Main Results:

    • Postactivation effects were observed in proximal muscles not directly involved in the preceding voluntary contraction of distal muscles.
    • Muscle tendon vibration revealed immediate postactivation effects as well as concealed changes lasting 15-20 minutes.
    • These findings suggest the involvement of central tonogenic structures activated by voluntary effort or afferent input.

    Conclusions:

    • Postactivation phenomena extend beyond the directly activated muscles, influencing proximal muscle groups.
    • Concealed changes in motor system excitability persist for a significant duration after voluntary effort.
    • Postactivation effects serve as a valuable tool for investigating the neural underpinnings of postural control.

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