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Stretch reflex modulation during a cyclic elbow movement.

W A MacKay, H C Kwan, J T Murphy

    Electroencephalography and Clinical Neurophysiology
    |June 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

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    This study investigated the stretch reflex in arm muscles during cyclic elbow movements. Results show reflex responses are modulated throughout the movement, anticipating and counteracting dynamic loads.

    Area of Science:

    • Neuroscience
    • Biomechanics
    • Human Motor Control

    Background:

    • The stretch reflex plays a crucial role in maintaining posture and executing movements.
    • Understanding reflex modulation during dynamic tasks is essential for comprehending motor control.

    Purpose of the Study:

    • To investigate the modulation of the stretch reflex in brachialis and triceps muscles during cyclic elbow movements.
    • To determine the timing and characteristics of reflex responses in relation to voluntary muscle activity and external loads.

    Main Methods:

    • 11 healthy subjects performed cyclic elbow flexion-extension movements in the horizontal plane.
    • Small torque pulses were applied to the forearm to elicit stretch reflexes.
    • Reflexes were analyzed across different phases of the movement cycle and under various loading conditions.

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    Main Results:

    • A late reflex (approx. 60 ms latency) was significantly modulated during the movement cycle.
    • Reflex amplitude increased at the onset of muscle contraction and anticipation of voluntary activity.
    • Peak reflex responses occurred prior to the peak rate of dynamic load increase, suggesting a predictive role.

    Conclusions:

    • The late stretch reflex is actively modulated during cyclic arm movements.
    • This modulation appears to be timed to provide anticipatory muscle force, aiding in the counteraction of dynamic loads.
    • Findings contribute to understanding the neural mechanisms underlying dynamic motor control.