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Related Concept Videos

Effects of feedback01:24

Effects of feedback

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Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
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A Vibrotactile Feedback Device for Seated Balance Assessment and Training
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Does visual augmented feedback reduce local dynamic stability while walking?

Daniel Hamacher1, Dennis Hamacher2, Lutz Schega2

  • 1Department of Sport Science, Otto von Guericke University Magdeburg, Germany.

Gait & Posture
|August 23, 2015
PubMed
Summary
This summary is machine-generated.

Visual augmented feedback for gait training may decrease local dynamic stability (LDS), potentially increasing fall risk. Clinicians should weigh this against potential benefits for gait pattern correction.

Keywords:
Fall riskGaitGait trainingLocal dynamic stability

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Area of Science:

  • Biomechanics
  • Rehabilitation Medicine
  • Neurology

Background:

  • Augmented feedback is crucial for gait training in patients with movement disorders.
  • Voluntary gait modifications can reduce local dynamic stability (LDS), increasing fall risk.
  • Visual feedback is often used to correct specific gait deviations.

Purpose of the Study:

  • To investigate the immediate impact of visual augmented feedback on the LDS of the pelvis and trunk.
  • To assess how visual cues for frontal plane movements affect gait stability.

Main Methods:

  • Kinematic gait data collected from ten women with gait disorders.
  • Analysis of local dynamic stability (LDS) using the largest Lyapunov exponent.
  • Comparison of LDS with and without visual augmented feedback.

Main Results:

  • A significant reduction in LDS was observed when subjects used visual augmented feedback (e.g., pelvis: p=.009).
  • Visual feedback led to less stable gait patterns, indicating a diminished capacity to manage small perturbations.
  • This suggests a potential increase in the risk of falling.

Conclusions:

  • Visual augmented feedback may compromise gait stability, potentially increasing fall risk.
  • The benefits of visual feedback for gait correction need to be balanced against its impact on stability.
  • Further research with larger, homogeneous cohorts is needed to confirm these findings and their clinical implications.