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Isokinetic Dynamometer Leg Extensor Peak Torque Measurement: A Time-Delayed Reliability and Score Selection Analysis

Brennan J Thompson1,2, Jennifer Xu3

  • 1Department of Kinesiology and Health Science, Utah State University, Logan, UT 84322, USA.

Journal of Functional Morphology and Kinesiology
|May 23, 2023
PubMed
Summary
This summary is machine-generated.

Long-term reliability of isokinetic and isometric peak torque (PT) in leg extensors varies by selection method. Averaging the highest two reps from the first two sets offers the best combination of efficiency and reliability.

Keywords:
Biodexmuscle functionmuscle strengthpeak forcequadricepsstrength testing

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Area of Science:

  • Biomechanics and Exercise Physiology
  • Musculoskeletal Function Assessment
  • Sports Science and Rehabilitation

Background:

  • Previous research on isokinetic peak torque (PT) reliability primarily used short-term testing intervals (<10 days).
  • Many practical applications involve longer inter-trial testing periods (weeks to months).
  • Methods for selecting and reporting PT from multiple repetitions lack thorough investigation regarding reliability and performance comparisons.

Purpose of the Study:

  • To examine the long-term reliability of isokinetic and isometric peak torque (PT) in leg extensors.
  • To compare the reliability and performance implications of various PT score selection methods.
  • To identify an optimal PT selection method balancing efficiency, reliability, and bias reduction.

Main Methods:

  • Thirteen participants (19.5 years) completed two testing trials separated by approximately 29 days.
  • Maximal voluntary contractions were assessed using isokinetic (60 and 240 deg/s) and isometric leg extension protocols.
  • Seven distinct PT score selection methods were applied to analyze reliability using intraclass correlation coefficients (ICCs).

Main Results:

  • Reliability varied significantly across contraction types and PT selection methods (ICCs: 0.48–0.87).
  • Isokinetic at 240 deg/s demonstrated higher reliability (ICCs: 0.77–0.87) than at 60 deg/s (ICCs: 0.48–0.81).
  • Isometric PT showed moderate reliability (ICCs: 0.71–0.73), and methods using later sets generally yielded higher scores than set 1.

Conclusions:

  • Long-term reliability of leg extensor PT is dependent on the chosen score selection method.
  • The average of the highest two repetitions from the first two sets of three provides a reliable and efficient PT measure.
  • This method minimizes systematic error and offers a practical approach for long-term strength assessment.