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Related Experiment Videos

Reliability of knee extensor and flexor torques during continuous concentric-eccentric cycles.

J F Kramer1

  • 1Department of Physical Therapy, Faculty of Applied Health Sciences, University of Western Ontario, London, Canada.

Archives of Physical Medicine and Rehabilitation
|June 1, 1990
PubMed
Summary

Reliable knee extensor and flexor torques were achieved using a continuous concentric-eccentric cycle protocol. This method demonstrated high test-retest reliability for peak and average torques in healthy adults.

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Exercise Physiology

Background:

  • Assessing muscle strength and function is crucial in sports science and rehabilitation.
  • Isokinetic dynamometry is a standard method for measuring torque, but its reliability requires validation.
  • Understanding the reliability of specific protocols is essential for accurate performance evaluation.

Purpose of the Study:

  • To evaluate the test-retest reliability of peak and average torques for knee extensors and flexors.
  • To compare reliability across different angular velocities (45°/sec and 90°/sec) and muscle actions (concentric vs. eccentric).
  • To determine the effectiveness of a continuous concentric-eccentric cycle protocol for reliable torque measurements.

Main Methods:

  • Twenty healthy women and 15 healthy men participated in the study.

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  • Peak and average torques were measured on three separate occasions within a 10-day period.
  • Participants performed continuous concentric-eccentric cycles at 45°/sec and 90°/sec angular velocities.

    • Main Results:

    • Peak and average torques showed no significant or systematic variations across the test occasions.
    • Intraclass correlation coefficients (ICCs) for peak torques ranged from 0.79 to 0.91, and for average torques from 0.75 to 0.88.
    • Eccentric muscle actions yielded significantly higher torques than concentric actions (p < 0.01).

    Conclusions:

    • A continuous concentric-eccentric cycle protocol, incorporating specific practice contractions, provides reliable isokinetic torque measurements.
    • The protocol demonstrates good to excellent reliability for both peak and average torques of knee extensors and flexors.
    • Findings support the use of this protocol for consistent and dependable assessment of knee muscle strength.