Date Approved

1995

Graduate Degree Type

Thesis

Degree Name

Physical Therapy (M.S.)

Degree Program

Physical Therapy

First Advisor

Gordan Alderink

Second Advisor

William Bell

Third Advisor

Jolene Bennett

Abstract

The purpose of this study was to investigate the correlation between knee strength and endurance, as tested by the Biodex{dollar}\sp\circler{dollar} isokinetic system, and the lateral step-up, cross-over hop for distance, and triple hop for distance. Subjects included 20 males and 30 females aged 21-40 years with no history of low back, hip, knee, or ankle injury that was treated by a physician. Bilateral knee flexion and extension strength, power, and endurance was measured at 60, 180 and 300 degrees/second with the hip extended and flexed 115{dollar}\sp\circ{dollar}. Isokinetic data were normalized to body weight and correlated to hop distance which was normalized to height. The relationship between total work from the lateral step-up and isokinetic data was also determined. Paired t-tests demonstrated no difference (p {dollar}<{dollar}.05) in quadriceps femoris and hamstrings torque in the sitting and supine positions. Likewise, there was no difference in torque production between right and left extremities. The lateral step-up was the only functional test to demonstrate little or no correlation (r =.00-.25) with all isokinetic variables. Triple hop and cross-over hop for distance demonstrated a moderate to good (r =.50-.69) correlation to various isokinetic values, although no specific trend was noted. All other correlations between isokinetic and functional variables ranged from r =.26-.49. The results suggest that open chain isokinetic data should be used cautiously when assessing a patient's functional status.

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