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Suppressing a Blocked Balance Recovery Step: A Novel Method to Assess an Inhibitory Postural Response.

David A E Bolton1,2, Charlie C Baggett1, Chase A Mitton1

  • 1Department of Kinesiology and Health Science, Utah State University, Logan, UT 84322, USA.

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|October 28, 2023
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This study introduces a new way to measure how well people can stop a step to avoid obstacles during balance recovery. Good performance in this test relates to a handheld device, suggesting clinical potential.

Keywords:
ReacStickreactive balanceresponse inhibitionstepping

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Motor Control

Background:

  • Stepping is crucial for maintaining balance and avoiding falls.
  • Adapting stepping reactions is necessary when encountering obstacles, typically guided by visual information.
  • Assessing the ability to inhibit a planned step in response to visual cues during balance recovery is important.

Purpose of the Study:

  • To describe a novel method for assessing visually prompted step inhibition within a reactive balance task.
  • To investigate the relationship between step suppression during balance recovery and inhibitory capacity measured by a handheld device (ReacStick).
  • To explore the potential clinical translation of this assessment method.

Main Methods:

  • Participants performed a reactive balance task involving stepping to recover from a supported forward lean.
  • Obstacles were introduced on rare trials to prompt step inhibition.
  • Occlusion goggles controlled visual timing relative to postural perturbation; inhibitory capacity was measured using the ReacStick handheld device.

Main Results:

  • A significant correlation was found between ReacStick performance and successful step inhibition (r = 0.57).
  • Overall reaction accuracy in the balance task also correlated significantly with ReacStick performance (r = 0.76).
  • The study successfully developed and validated a novel method for assessing rapid inhibition in a dynamic postural context.

Conclusions:

  • The ability to rapidly inhibit a planned step is a prerequisite for adaptive balance strategies.
  • Performance on the novel inhibition assessment task is significantly related to ReacStick performance.
  • The findings suggest potential clinical applications for the ReacStick device in evaluating inhibitory capacity.