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Related Experiment Video

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An Instrumented Pull Test to Characterize Postural Responses
12:18

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Published on: April 6, 2019

Direction-dependent neck and trunk postural reactions during sitting.

Nancy St-Onge1, Julie N Côté, Richard A Preuss

  • 1Department of Exercise Science, Concordia University, 7141 Sherbrooke St. West, Montreal, QC, Canada. nancy.st-onge@concordia.ca

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|September 16, 2011
PubMed
Summary

Forward translations caused greater body movement and earlier stabilizing forces in healthy seated individuals compared to backward translations. This suggests forward movements pose a higher postural threat, requiring quicker neck and trunk stabilization.

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Last Updated: May 29, 2026

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Neuroscience

Background:

  • Postural reactions in seated individuals are direction-dependent.
  • Neck responses to forward vs. backward translations are not well-compared.

Purpose of the Study:

  • Compare neck and trunk kinematic, kinetic, and EMG stabilization to forward and backward translations in seated individuals.

Main Methods:

  • Ten healthy individuals were exposed to forward/backward translations on a movable platform.
  • Recorded head/trunk kinematics, EMG of 16 muscles, and calculated COM and joint moments.

Main Results:

  • Forward translations resulted in greater COM peak displacements.
  • Earlier peak moments of force were observed during forward translations.
  • These findings suggest a higher postural threat during forward translations.

Conclusions:

  • Seated individuals exhibit distinct neck and trunk stabilization strategies for forward vs. backward translations.
  • Forward translations elicit a more robust and rapid postural response due to increased perceived threat.