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Experimental Methods to Study Human Postural Control
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Simultaneous Postural Adjustments (SPA) scrutinized using the Lissajous method.

Paul Fourcade, Clint Hansen, Serge LeBozec

    Journal of Biomechanics
    |December 3, 2014
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    Area of Science:

    • Neuroscience
    • Biomechanics
    • Motor Control

    Background:

    • Voluntary movements involve complex interactions between focal and postural body segments.
    • Understanding the timing and role of these adjustments is crucial for motor control research.

    Purpose of the Study:

    • To investigate the kinetics and timing of simultaneous postural adjustments (SPA) during a maximal velocity pointing task.
    • To elucidate the dual role of the postural system during voluntary upper limb movements.

    Main Methods:

    • Utilized a 2-DOF model to differentiate focal (upper limb) and postural (rest of body) components.
    • Recorded upper limb kinematics and body kinetics during a maximal velocity pointing task.
    • Analyzed the relationship between shoulder action (AoSh) and resultant reaction (RoSh) using Lissajous ellipses to estimate time lag.

    Main Results:

    • Postural component kinetics preceded focal component kinetics.
    • The time lag in SPA was comparable to anticipatory postural adjustment (APA) duration.
    • Postural component kinetics opposed pointing-induced perturbations during specific movement phases.

    Conclusions:

    • The postural component exhibits a dual role: stabilization and propulsion, varying with movement phase.
    • Findings provide insights into motor control mechanisms in healthy individuals.
    • This research can help differentiate motor impairments based on postural adjustment patterns.