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Force-Time Measurements of Knee Muscle Functions of Subjects with Multiple Sclerosis

Mrs. Chen was a graduate student, School of Allied Medical Professions, The Ohio State University, when this study was completed in partial fulfillment of her master of science degree.
Mr. Pierson is Assistant Professor and Director, Division of Physical Therapy, School of Allied Medical Professions, The Ohio State University, 1583 Perry St, Columbus, OH 43210-1234 (USA).
Miss Burnett is Associate Professor, Division of Physical Therapy, School of Allied Medical Professions, The Ohio State University.

The purpose of this study was to determine whether the time-rate of muscle tension development, the muscle tension-maintaining capacity, and the reciprocal inhibition time of muscles in subjects with multiple sclerosis were significantly different from those of healthy subjects. An isokinetic dynamometer was used to evaluate the quadriceps femoris and hamstring muscles of 15 Experimental Group subjects with multiple sclerosis and 17 healthy Control Group subjects. The muscles were tested isometrically at 45 degrees of knee flexion and isokinetically at speeds of 30°/sec and 90°/sec. The subjects with multiple sclerosis demonstrated a significant (p < .001) slowing of the time-rate of muscle tension development and a significant (p < .005) decrease in muscle tension-maintaining capacity when compared with healthy subjects. The difference in the reciprocal inhibition time of muscles of the Experimental and Control Groups was not significant. When the reciprocal inhibition time of muscles was expressed as a percentage of the total torque curve, however, a significant prolongation (p < .001) was observed in the subjects with multiple sclerosis.

Key Words: Multiple sclerosis • Muscle spasticity • Muscles • Physical therapy

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