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Performance characteristics of the Kin-Com dynamometer

T P Mayhew1, J M Rothstein, S D Finucane

  • 1Department of Physical Therapy, Medical College of Virginia, Virginia Commonwealth University, Richmond 23298.

Physical Therapy
|November 1, 1994
PubMed
Summary
This summary is machine-generated.

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The Kin-Com dynamometer demonstrates high accuracy and reliability for static force and angle measurements, crucial for gravity-correction and isometric testing. Its velocity control is also accurate under no-load conditions.

Area of Science:

  • Biomechanics
  • Kinesiology
  • Rehabilitation Engineering

Background:

  • The Kin-Com dynamometer is a widely used device for assessing muscle strength and joint range of motion.
  • Accurate performance characteristics are essential for reliable clinical and research applications.

Purpose of the Study:

  • To evaluate the performance characteristics of the Kin-Com dynamometer (model #500-11).
  • To assess the accuracy and reliability of force, angle, and velocity measurements under controlled conditions.

Main Methods:

  • Compared Kin-Com measurements (force, angle, velocity) with an external recording system.
  • Analyzed linear relationships using the coefficient of determination (r2).
  • Examined between-day reliability using the intraclass correlation coefficient (ICC[2,1]).

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Main Results:

  • Coefficient of determination (r2) for force, angle, and velocity comparisons exceeded .99 in all conditions.
  • Intraclass correlation coefficient (ICC) for between-day reliability was above .99 for all measurements.

Conclusions:

  • Static force and angle measurements are accurate and replicable, suitable for gravity-correction and isometric testing.
  • The Kin-Com dynamometer's velocity control is accurate and replicable under no-load conditions.
  • Using acceleration/deceleration modes other than "high" caused a loss of lever arm excursion.