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Related Experiment Video

Updated: May 15, 2026

Isokinetic Robotic Device to Improve Test-Retest and Inter-Rater Reliability for Stretch Reflex Measurements in Stroke Patients with Spasticity
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A reliability study for standing functional reach test using modified and traditional rulers.

Yi-Hung Lin1, Tou-Rong Chen, Yung-Wen Tang

  • 1Graduate Institute of Medical, Laboratory and Biotechnology, Chung Shan Medical University, Taichung City, Taiwan.

Perceptual and Motor Skills
|December 26, 2012
PubMed
Summary

The functional reach test shows similar reliability using traditional or modified rulers. Using the mean of two trials is recommended for measuring standing reach distance with either ruler.

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Area of Science:

  • Biomechanics
  • Physical Therapy
  • Gerontology

Background:

  • The functional reach test is a common assessment for balance and fall risk.
  • Standardized measurement tools are crucial for reliable clinical assessments.

Purpose of the Study:

  • To evaluate the test-retest and interrater reliability of the functional reach test using traditional and modified rulers.
  • To compare the functional reach test scores based on one, two, or three trials.

Main Methods:

  • Sixty-four participants (aged 19-70) performed the functional reach test.
  • Intraclass correlation coefficient (ICC) assessed reliability.
  • Standard error of measurement (SEM) was calculated.

Main Results:

  • Both rulers yielded similar reach scores, with no significant statistical differences.
  • Reliability estimates (ICC) were high for both two-trial (0.87-1.00) and three-trial (0.89-1.00) means.
  • The modified ruler consistently produced a smaller SEM compared to the traditional ruler.

Conclusions:

  • The modified ruler offers a reliable alternative for measuring standing reach distance.
  • A mean of two trials is recommended for consistent and reliable functional reach test performance measurement.