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Related Experiment Videos

Postural forearm changes induced by predictable in time or voluntary triggered unloading in man.

M Dufossé, M Hugon, J Massion

    Experimental Brain Research
    |January 1, 1985
    PubMed
    Summary

    Anticipatory muscle deactivation, crucial for stabilizing posture during unloading, was only observed when subjects voluntarily used their other hand to release a load. Predictable timing or voluntary key presses did not elicit this anticipatory response.

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    Area of Science:

    • Neuroscience
    • Human Motor Control
    • Biomechanics

    Background:

    • Maintaining a stable posture against external loads requires complex sensorimotor integration.
    • Anticipatory muscle activity plays a key role in preparing the musculoskeletal system for expected perturbations.
    • The unloading reflex is a well-documented response to the sudden removal of a load.

    Purpose of the Study:

    • To investigate the neural mechanisms underlying anticipatory muscle deactivation during load unloading.
    • To compare the effects of voluntary, predictable, and unpredictable unloading on forearm muscle activity and joint rotation.
    • To determine if temporal cues or voluntary triggering alone can elicit anticipatory muscle responses.

    Main Methods:

    • Human subjects maintained a loaded forearm in a horizontal position.

    Related Experiment Videos

  • Electromyography (EMG) of forearm muscles (biceps, brachio-radialis, triceps), elbow joint angle, and wrist forces were recorded.
  • Four unloading conditions were tested: voluntary contralateral hand unloading, unpredictable passive unloading, predictable passive unloading (cued by tone), and self-triggered unloading (key press).

    • Main Results:

    • Voluntary unloading by the contralateral hand elicited anticipatory deactivation of forearm flexors, preventing elbow rotation.
    • Unpredictable passive unloading resulted in forearm rotation and the classical unloading reflex.
    • Predictable unloading and self-triggered unloading did not produce anticipatory deactivation; forearm rotation initially resembled unpredictable unloading, with some subjects later showing reduced rotation possibly due to enhanced reflex action.

    Conclusions:

    • Anticipatory deactivation of forearm flexors is specifically linked to coordinated voluntary load release by the contralateral limb.
    • Temporal information (predictable timing) or voluntary triggering (key press) alone is insufficient to induce this anticipatory response.
    • The findings highlight the role of specific motor commands and sensory feedback in modulating preparatory muscle activity for postural control.