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Related Experiment Video

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The reliability, variability and minimal detectable change of multiplanar isometric trunk strength testing using a

Jonathan Bucke1,2, Adam Mattiussi3, Karen May2

  • 1Ballet Healthcare, Royal Opera House, London, UK.

Journal of Sports Sciences
|June 20, 2024
PubMed
Summary

This study shows a fixed digital dynamometer reliably measures trunk strength in multiple directions. This offers a practical and dependable tool for assessing core strength in clinical settings and sports.

Keywords:
ForceLateral trunk flexiontrunk extensiontrunk flexion

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Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Clinical Assessment

Background:

  • Trunk strength is crucial for athletic performance, rehabilitation, and overall health.
  • Existing trunk strength assessment methods are often costly, not portable, or lack reliability.
  • There is a need for dependable and accessible tools to measure trunk strength.

Purpose of the Study:

  • To evaluate the reliability, variability, standard error of measurement, and minimal detectable change (MDC) of trunk strength.
  • To assess trunk strength in the sagittal (flexion, extension) and frontal (lateral flexion) planes.
  • To determine the effectiveness of a fixed digital dynamometer for trunk strength assessment.

Main Methods:

  • Eighteen participants (10 men, 8 women) underwent two testing sessions separated by 7 days.
  • Participants performed maximal voluntary isometric contractions using a trunk harness attached to a fixed digital dynamometer.
  • Measurements were taken in four positions: prone, supine, left-side recumbent, and right-side recumbent.

Main Results:

  • All tested positions demonstrated excellent within-session (ICC: 0.95-0.98; CV: 5-7%) and between-session (ICC: 0.98-0.99; CV: 4-6%) reliability.
  • Low variability was observed across all positions and sessions.
  • Between-session minimal detectable change (MDC) ranged from 8% to 13%, equating to 2.9-3.2 kg.

Conclusions:

  • Maximal isometric force testing with a fixed digital dynamometer provides highly reliable measurements of multiplanar trunk strength.
  • This method offers a practical and dependable approach for clinical use.
  • The findings support the use of this device for accurate trunk strength evaluation.