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A control systems framework for understanding normal and abnormal posture.

W A Lee1

  • 1Programs in Physical Therapy, Northwestern University Medical School, Chicago, Illinois 60611.

The American Journal of Occupational Therapy : Official Publication of the American Occupational Therapy Association
|May 1, 1989
PubMed
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This study introduces a control systems framework to analyze normal and abnormal posture, focusing on postural control during arm movements and its clinical relevance. It details error correction mechanisms and objective system behavior descriptions.

Area of Science:

  • Biomechanics
  • Control Systems Theory
  • Neuroscience

Background:

  • Understanding normal and abnormal posture is crucial for diagnosing and treating various neurological and musculoskeletal conditions.
  • Existing frameworks often lack a unified approach to postural control, particularly during dynamic tasks like arm movements.

Purpose of the Study:

  • To present a control systems framework for analyzing normal and abnormal posture.
  • To emphasize postural control mechanisms during arm movements.
  • To discuss the clinical implications of postural control.

Main Methods:

  • Defining and distinguishing between joint posture and balance outputs.
  • Describing the roles of command and perturbing inputs.
  • Analyzing the effects of initial conditions on postural control.

Related Experiment Videos

  • Detailing active closed-loop and open-loop control processes for error correction.

    • Main Results:

    • A framework is presented that differentiates joint posture and balance outputs.
    • Mechanisms for correcting postural errors, including active feedback and feedforward control, are described.
    • Objective system behavior can be quantified using gains, time delays, and thresholds of input-output functions.

    Conclusions:

    • The proposed control systems framework provides a comprehensive method for understanding postural control.
    • The framework offers valuable insights into clinical conditions affecting posture and movement.
    • Objective measures of system behavior can aid in the assessment and rehabilitation of postural deficits.