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Response inhibition during avoidance of virtual obstacles while walking.

Zrinka Potocanac1, Wouter Hoogkamer, Felipe P Carpes

  • 1Department of Kinesiology, KU Leuven, Belgium.

Gait & Posture
|August 24, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel walking test to measure motor inhibition, crucial for preventing falls. Reducing response distance significantly increased failures, validating the test

Keywords:
Accidental fallsGaitObstacle avoidancePrecision steppingResponse inhibition

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Motor Control

Background:

  • Motor inhibition, the ability to suppress planned movements, is vital for preventing falls during locomotion.
  • While typically assessed in hand function, evaluating motor inhibition in lower limbs during walking is less explored.
  • Developing a reliable test for gait-related motor inhibition could aid in fall risk assessment.

Purpose of the Study:

  • To develop and validate a novel treadmill-based test to assess motor inhibition during walking.
  • To investigate the impact of varying response distances on the accuracy of gait adjustments.
  • To establish a protocol for evaluating motor inhibition in young adults, with potential application to older adults.

Main Methods:

  • Subjects walked on a treadmill, stepping on projected light patches that could change color, requiring step adjustments.
  • Four difficulty conditions were implemented by manipulating the available response distance.
  • Failure rates (inability to adjust steps) were analyzed across conditions.

Main Results:

  • A significant increase in failure rates was observed when the available response distance was reduced by 150 mm (from 15.6% to 65.1%).
  • The novel walking test demonstrated sensitivity to changes in motor inhibition demands.
  • Adjusting a precise aiming movement during walking proved more challenging than automatic movement adjustments.

Conclusions:

  • The developed treadmill task effectively assesses motor inhibition levels during walking.
  • This test provides a valuable tool for quantifying gait-related response inhibition.
  • Findings highlight the complexity of modifying pre-programmed gait adjustments, particularly under time constraints.