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Reliability and Validity of a New Method for Isometric Back Extensor Strength Evaluation Using A Hand-Held

Hee-Won Park1,2,3, Sora Baek1,2, Hong Young Kim2

  • 1Department of Rehabilitation Medicine, Kangwon National University Hospital, Kangwon National University School of Medicine, Chuncheon, Korea.

Annals of Rehabilitation Medicine
|December 5, 2017
PubMed
Summary

A new portable dynamometer method for measuring isometric back extensor strength demonstrates excellent test-retest reliability and acceptable validity. This reliable tool offers a promising approach for assessing back extensor muscle function.

Keywords:
Back musclesIsometric contractionMuscle strength dynamometerReproducibility of results

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Area of Science:

  • Biomechanics
  • Musculoskeletal research
  • Physical therapy

Background:

  • Assessing isometric back extensor strength is crucial for evaluating spinal health and function.
  • Existing measurement methods can be cumbersome or require specialized equipment.
  • A need exists for a reliable, valid, and portable tool for strength assessment.

Purpose of the Study:

  • To evaluate the reliability and validity of a novel portable dynamometer for measuring isometric back extensor strength.
  • To establish the performance of a new device against a recognized standard.

Main Methods:

  • A custom chair with an integrated portable dynamometer (Power Track II Commander Muscle Tester) was utilized.
  • Isometric back extensor strength was measured in 20 healthy men and 30 healthy women.
  • Test-retest reliability was determined using intraclass correlation coefficient (ICC), and validity was assessed against the BTE PrimusRS system using Bland-Altman analysis.

Main Results:

  • The portable dynamometer exhibited excellent test-retest reliability (ICC = 0.82).
  • Bland-Altman analysis indicated acceptable agreement between the portable dynamometer and the BTE PrimusRS system, with limits of agreement ranging from -63.1 N to 61.1 N.

Conclusions:

  • The portable dynamometer is a reliable and valid instrument for measuring isometric back extensor strength.
  • This device offers a practical and effective option for clinical and research settings.
  • The findings support the use of this portable dynamometer for assessing back extensor function.