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Paraspinal muscle reflex dynamics.

K P Granata¹, G P Slota, B C Bennett

¹Motion Analysis and Motor Performance Laboratory, University of Virginia, 2270 Ivy Road, Charlottesville, VA 22903, USA. granata@vt.edu

Journal of Biomechanics

|January 7, 2004

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Paraspinal muscle reflexes provide feedback for spinal stability, responding to trunk disturbances. This study quantified reflex gain, finding it increases with perturbation but decreases with trunk flexion preload.

Area of Science:

Biomechanics
Neuroscience
Human Motor Control

Background:

Spinal stability relies on neuromuscular control, with paraspinal reflexes acting as a feedback mechanism against trunk disturbances.
Previous research explored preparatory muscle recruitment, but paraspinal reflex gain as a feedback response remains under-characterized.

Purpose of the Study:

To quantify the input-output dynamics of paraspinal reflexes using impulse response function (IRF).
To investigate the influence of perturbation force and trunk flexion preload on paraspinal reflex gain.

Main Methods:

Surface electromyography (EMG) recorded from trunk muscles during anteriorly directed impact force perturbations.
Trunk perturbation forces ranged from 6.1 to 12.0 Ns with 0 and 110 N flexion preload.

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Impulse response function (IRF) and its gain (G(IRF)) were calculated from EMG output and force input.

Main Results:

Reflex EMG was quantifiable in 91% of perturbations, with a mean onset latency of 30.7 ms.
Reflex amplitude and G(IRF) increased with perturbation force impulse.
G(IRF) showed a declining trend with increasing flexion preload.

Conclusions:

Paraspinal reflex gain is a quantifiable measure of neuromechanical feedback for spinal stability.
Flexion preload appears to modulate the reflex response, suggesting a complex interaction in maintaining stability.
Further research is needed to elucidate the precise contribution of these reflex dynamics to overall spinal stability.