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J Athl Train. 1992; 27(4): 362–365.
PMCID: PMC1317290

Test-Retest Reliability of Reciprocal Isokinetic Knee Extension and Flexion Peak Torque Measurements

Robert W. McCleary, MS, ATC and J.C. Andersen, PhD, ATC, PT


Our purpose in conducting this study was to estimate the reliability of reciprocal concentric knee extension and flexion peak torque obtained in uninjured male athletes using the Biodex isokinetic dynamometer. Twenty-six male intercollegiate athletes (age=19.5±4.1 yr; ht=70.3±14.9 in; wt=212.9±48.5 lb) participated in this study. We used the Biodex to measure peak torque occurring during right knee extension and flexion over 3 consecutive days. Means and standard deviations were calculated for both extension and flexion on each of the 3 days. We observed a significant main effect for days for both extension and flexion. Mean peak torque for the first day was significantly higher (Turkey, p<.05) than the means for the other 2 days, which were not significantly different from each other (Turkey, p>0.05). Intraclass correlation coefficients (ICCs) were estimated for each of the six trials on each of the 3 days. Intraclass correlation coefficients (ICCs) ranged from .88 on trial 1, day 1 for both extension and flexion peak torque to .97 for extension peak torque and .98 for flexion peak torque on day 3, trial 6. The standard error of measurement for extension peak torque was 7.0 ft-lbs and for flexion peak torque was 3.0 ft-lbs. These results indicate that reliable measurements of reciprocal right knee extension and flexion peak torque can be obtained from uninjured male athletes with the Biodex isokinetic dynamometer.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Gross MT, McGrain P, Demilio N, Plyler L. Relationship between multiple predictor variables and normal knee torque production. Phys Ther. 1989 Jan;69(1):54–62. [PubMed]
  • Sobal J, Klein H, Graham D, Black J. Health concerns of high school students and teachers' beliefs about student health concerns. Pediatrics. 1988 Feb;81(2):218–223. [PubMed]
  • Johnson J, Siegel D. Reliability of an isokinetic movement of the knee extensors. Res Q. 1978 Mar;49(1):88–90. [PubMed]
  • Kroll W. Reliability theory and research decision in selection of a criterion score. Res Q. 1967 Oct;38(3):412–419. [PubMed]

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