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Obtaining Reliable Measurements of Knee Extensor Torque Produced During Maximal Voluntary Contractions: An Experimental Investigation

JM Kues, PT, was a student in the Department of Physical Therapy, Medical College of Virginia, Virginia Commonwealth University, when this study was completed in partial fulfillment of the requirements for her Master of Science degree. She is Assistant Professor, Department of Physical Therapy, School of Allied Health Professions, Medical College of Virginia, Virginia Commonwealth University, PO Box 224, MCV Station, Richmond, VA 23298-0224 (USA).
JM Rothstein, PhD, PT, is Professor and Head, Department of Physical Therapy, College of Associated Health Professions, University of Illinois at Chicago, 1919 W Taylor St, Chicago, IL 60612, and Chief, Physical Therapy Services, University of Illinois Hospital.
RL Lamb, PhD, PT, is Professor and Chairman, Department of Physical Therapy, School of Allied Health Professions, Medical College of Virginia, Virginia Commonwealth University.

The purpose of this study was to develop and test a protocol that could be used to obtain reliable measurements of knee extensor torque produced during maximal voluntary contractions. On each of 3 days, 10 subjects performed six consecutive maximal voluntary contractions, in the same randomized order, for each of the following 10 conditions: concentric isokinetic contractions at velocities of 30°, 90°, 120°, and 180°/s; eccentric isokinetic contractions at velocities of 30°, 90°, 120°, and 180°/s; and isometric contractions at 40 and 60 degrees of knee flexion. The peak torques produced were examined to determine on which day and during which contraction subjects produced the greatest torques for each condition. This information was used to develop a practice protocol. Fifteen different subjects were tested following this protocol. Subjects participated in two practice sessions, a test session, and a retest session. Intraclass correlation coefficients (ICCs) were calculated to determine the degree of agreement between torques for the test and retest sessions. The ICCs ranged from .87 to .98. The protocol developed appears to be useful for obtaining reliable measurements of knee extensor torque.

Key Words: Lower extremity, knee • Motor learning • Muscle performance, lower extremity/measurement • Tests and measurements

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Scott D Minor
Physical Therapy 1992 72: 501-503. [Abstract] [PDF]

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