Reliability of Concentric and Eccentric Muscle Testing of Adults with Cerebral Palsy

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Leona Holland University of Alberta

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Jeff McCubbin Oregon State University

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Ewen Nelson University of Alberta

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Robert Steadward University of Alberta

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The purpose of this study was to determine the reliability of eccentric and concentric strength of adults with cerebral palsy (CP) as measured on the Kin-Corn. Fourteen subjects performed four eccentric and concentric contractions of shoulder adduction and abduction, and knee flexion and extension at a speed of 60°/s during three testing sessions. Peak and average torque were calculated for each type of contraction for each of the four movements. Generalizability coefficients were high for all scores (r = .79 to .96) except average eccentric extension of the knee (r = .26). The variance components revealed that differences between test sessions were large (8.5%–65.8%) compared to the differences between trials (0.0%–5.8%). These data indicate that the Kin-Corn is a reliable mode for testing average and maximal concentric muscular strength, and maximal eccentric contractions on adults with CP, following an initial orientation session.

Leona Holland, Ewen Nelson, and Robert Steadward are with the Rick Hansen Centre at the University of Alberta, W1-67 Van Vliet Complex, Edmonton, AB, Canada T6G 2H9. Jeff McCubbin is with the College of Health and Human Performance, 120 Women’s Building, Oregon State University, Corvallis, OR 97331-6802.

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