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Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
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Quantifying trunk neuromuscular control using seated balancing and stability threshold.

N Peter Reeves1, Victor Giancarlo Sal Y Rosas Celi2, Ahmed Ramadan3

  • 1Sumaq Life LLC, East Lansing, MI, USA; MSU Center for Orthopedic Research, Michigan State University, Lansing, MI, USA.

Journal of Biomechanics
|September 22, 2020
PubMed
Summary
This summary is machine-generated.

Challenging trunk neuromuscular control with a robotic seat quantifies balance ability. Heavier and female participants showed poorer control, indicating factors beyond health status influence balance assessment.

Keywords:
Core controlCore stabilityPostural controlReliabilitySexUnstable seat

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Area of Science:

  • Biomechanics
  • Neuromuscular Control
  • Human Movement Science

Background:

  • Seated balancing assesses trunk neuromuscular control, crucial for evaluating back pain impairments.
  • Current methods may not maximally challenge control, leading to ambiguous results influenced by personal preference rather than health status.

Purpose of the Study:

  • To develop a less ambiguous method for assessing trunk neuromuscular control by maximally challenging balance.
  • To quantify trunk neuromuscular control using critical stiffness (kCrit) on a robotic seat.
  • To investigate the influence of anthropometric and demographic factors on kCrit and its reliability.

Main Methods:

  • Thirty-four healthy subjects performed a seated balancing task on a robotic seat with adjustable rotational stiffness.
  • Rotational stiffness was gradually reduced until subjects lost balance, determining critical stiffness (kCrit).
  • Test-retest reliability was assessed over three days, with anthropometric and demographic influences analyzed.

Main Results:

  • Higher critical stiffness (kCrit), indicating poorer control, was significantly associated with greater body weight and female sex.
  • Height and age did not significantly influence kCrit.
  • Anthropometric and demographic factors affected reliability estimates, necessitating adjustments for accurate assessment.

Conclusions:

  • Critical stiffness (kCrit) on a robotic seat provides a reliable measure of trunk neuromuscular control, even after accounting for anthropometric and demographic influences.
  • This method offers a precise way to set exercise difficulty for optimizing trunk control and spine health.
  • Future assessments should consider and adjust for factors like body weight and sex to ensure unambiguous evaluation of neuromuscular control.