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Testing a novel isokinetic dynamometer constructed using a 1080 Quantum.

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Summary
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Two custom-built isokinetic dynamometers showed high reliability for measuring leg extension power. Model A demonstrated better comparability with the gold-standard Humac Norm than Model B.

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Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Sports Science

Background:

  • Isokinetic dynamometers are crucial for assessing muscular strength and power.
  • Custom-built devices offer potential cost-effective alternatives to gold-standard equipment.
  • Assessing the reliability and comparability of new devices is essential for their adoption in research and clinical settings.

Purpose of the Study:

  • To evaluate the reliability and comparability of two custom-built isokinetic dynamometers (Model A and Model B) against a gold-standard device (Humac Norm).
  • To determine the accuracy of power, force, and velocity measurements from the custom devices.

Main Methods:

  • Twenty healthy subjects performed maximal concentric leg extensions at 180° s-1 on Model A, Model B, and the Humac Norm.
  • Peak power, mean power, and fatigue indexes were recorded for each device.
  • Statistical analysis included intraclass correlation coefficient (ICC), coefficient of variation (CV), and standard error of measurement (SEM).

Main Results:

  • Both custom dynamometers exhibited high test-retest reliability for peak and mean power (ICC > 0.88).
  • Model A showed good comparability with the Humac Norm, with small CV (9.0% mean, 8.4% peak) and SEM (49W).
  • Model B demonstrated greater variance compared to the Humac Norm (CV = 13.3% mean, 14.7% peak; SEM = 120W mean, 146W peak).

Conclusions:

  • Custom-built isokinetic dynamometers can provide highly reliable measures of muscular performance.
  • Model A offers a reliable and comparable alternative to the Humac Norm for leg extension power assessment.
  • While both custom models are reliable, absolute power outputs differ, necessitating consistent use of a single device for longitudinal tracking or intervention studies.