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Reliability and Validity of Force Platform Measures of Balance Impairment in Individuals With Parkinson Disease

Cathy C. Harro, Alicia Marquis, Natasha Piper, Chris Burdis
DOI: 10.2522/ptj.20160099 Published 1 December 2016
Cathy C. Harro
C.C. Harro, PT, MS, Department of Physical Therapy, College of Health Professions, Grand Valley State University, 301 Michigan St NE, Suite 268, Grand Rapids, MI 49503 (USA).
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Alicia Marquis
A. Marquis, PT, DPT, ATC, Department of Physical Therapy, College of Health Professions, Grand Valley State University.
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Natasha Piper
N. Piper, PT, DPT, Department of Physical Therapy, College of Health Professions, Grand Valley State University.
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Chris Burdis
C. Burdis, PT, DPT, Department of Physical Therapy, College of Health Professions, Grand Valley State University.
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Abstract

Background Complex movement and balance impairments in people with Parkinson disease (PD) contribute to high fall risk. Comprehensive balance assessment is warranted to identify intrinsic fall risk factors and direct interventions.

Objective The purpose of this study was to examine the psychometric properties of 3 balance measures of a force platform (FP) system in people with PD.

Methods Forty-two community-dwelling individuals with idiopathic PD completed the testing protocol. Test-retest reliability was assessed for the Limits of Stability Test (LOS), Motor Control Test (MCT), and Sensory Organization Test (SOT). Intraclass correlation coefficients (ICC [2,1]) were calculated to determine test-retest reliability and minimal detectable change. Validity was assessed by comparing the FP measures with criterion gait and balance measures using Pearson product moment correlations. Multiple regression analyses examined the contribution of PD characteristics to FP measures.

Results All primary FP variables demonstrated excellent test-retest reliability (ICC=.78–.92). The SOT and LOS demonstrated fair to good correlations with criterion measures, whereas the MCT had fair correlations to balance measures only. Both SOT composite equilibrium and MCT average latency were moderately associated with disease severity.

Limitations This study's sample had a relatively small number of participants with a positive fall history, which may limit the generalizability of the findings.

Conclusions This study's findings provide support that FP measures are reliable and valid tests of balance impairment in people with PD. Disease severity was significantly associated with SOT and MCT measures, perhaps reflecting that these tests are meaningful indicators of decline in postural control with disease progression. Force platform measures may provide valuable quantitative information about underlying balance impairments in people with PD to guide therapeutic interventions for fall risk reduction.

Footnotes

  • All authors provided concept/idea/research design, writing, and data collection and analysis. Professor Harro provided project management, participants, and facilities/equipment.

  • The authors thank Dr Sango Otieno, Department of Statistics, Grand Valley State University, for his expertise and collaboration in the statistical analyses for this study.

  • This study was approved by the Institutional Review Board at Grand Valley State University.

  • Received March 4, 2016.
  • Accepted July 7, 2016.
  • © 2016 American Physical Therapy Association
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Vol 96 Issue 12 Table of Contents
Physical Therapy: 96 (12)

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Reliability and Validity of Force Platform Measures of Balance Impairment in Individuals With Parkinson Disease
Cathy C. Harro, Alicia Marquis, Natasha Piper, Chris Burdis
Physical Therapy Dec 2016, 96 (12) 1955-1964; DOI: 10.2522/ptj.20160099

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Reliability and Validity of Force Platform Measures of Balance Impairment in Individuals With Parkinson Disease
Cathy C. Harro, Alicia Marquis, Natasha Piper, Chris Burdis
Physical Therapy Dec 2016, 96 (12) 1955-1964; DOI: 10.2522/ptj.20160099
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  • Predictors of Reduced Frequency of Physical Activity 3 Months After Injury: Findings From the Prospective Outcomes of Injury Study
  • Effects of Locomotor Exercise Intensity on Gait Performance in Individuals With Incomplete Spinal Cord Injury
Show more Measurement

Subjects

  • Examination/Evaluation
    • Tests and Measurements
  • Neurology/Neuromuscular System
    • Parkinson Disease and Parkinsonian Disorders
    • Balance

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