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J Athl Train. 1993 Fall; 28(3): 227–229.
PMCID: PMC1317718

The Reliability Of Three Isokinetic Knee-extension Angle-specific Torques

Brent L. Arnold, MS, ATC
Brent L. Arnold is Doctoral Student in Sports Medicine at Curry School of Education, University of Virginia, Charlottesville, VA 22903
David H. Perrin, PhD, ATC
David H. Perrin is Associate Professor and Director of Graduate Athletic Training Education and Research at Curry School of Education, University of Virginia, Charlottesville, VA 22903.
Evan V. Hellwig, PhD, ATC, PT


To determine the reliability of concentric quadriceps muscle torque at 30°, 60°, and 75° of knee extension, 25 female university students were studied. Each subject was tested on the Kin-Com isokinetic dynamometer on 2 separate days, 7 days apart. The dynamometer's speed was set at 60°ls. Intraclass correlation coefficients for 30°, 60°, and 75° were 0.84 (p<.01), 0.87 (p<.01), and 0.83(p<.01), respectively. The standard errors of the measure were 5.92 N·m, 7.65 N·m, and 7.35 N·m, respectively. Based on the instrumentation and protocol used in this study, we believe angle-specific torques have good reliability. Because of the error size, clinicians using similar methodology to determine angle-specific torques should be cautious when comparing differences between angle-specific torques of less than 12 to 16 N·m.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Farrell M, Richards JG. Analysis of the reliability and validity of the kinetic communicator exercise device. Med Sci Sports Exerc. 1986 Feb;18(1):44–49. [PubMed]
  • Kannus P, Kaplan M. Angle-specific torques of thigh muscles: variability analysis in 200 healthy adults. Can J Sport Sci. 1991 Dec;16(4):264–270. [PubMed]
  • Kannus P, Yasuda K. Value of isokinetic angle-specific torque measurements in normal and injured knees. Med Sci Sports Exerc. 1992 Mar;24(3):292–297. [PubMed]
  • Kues JM, Rothstein JM, Lamb RL. Obtaining reliable measurements of knee extensor torque produced during maximal voluntary contractions: an experimental investigation. Phys Ther. 1992 Jul;72(7):492–504. [PubMed]
  • Snow CJ, Blacklin K. Reliability of knee flexor peak torque measurements from a standardized test protocol on a Kin/Com dynamometer. Arch Phys Med Rehabil. 1992 Jan;73(1):15–21. [PubMed]
  • Tredinnick TJ, Duncan PW. Reliability of measurements of concentric and eccentric isokinetic loading. Phys Ther. 1988 May;68(5):656–659. [PubMed]

Articles from Journal of Athletic Training are provided here courtesy of National Athletic Trainers Association