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  • Title: Reliability of a new instrument for measuring plantarflexor muscle strength.
    Author: Ortqvist M, Gutierrez-Farewik EM, Farewik M, Jansson A, Bartonek A, Broström E.
    Journal: Arch Phys Med Rehabil; 2007 Sep; 88(9):1164-70. PubMed ID: 17826463.
    Abstract:
    OBJECTIVES: To test the reliability of a new muscle strength testing instrument (the Strength Measuring Chair [SMC]) designed to quantify isometric strength in the lower extremities, and to determine the agreement between the SMC and an isokinetic dynamometer (Biodex). DESIGN: Isometric strength tests were performed in plantarflexors with 2 different knee positions (60 degrees, 30 degrees). Measurements were taken at 3 different sessions. SETTING: Strength testing laboratory. PARTICIPANTS: Twenty-three able-bodied adults and 15 able-bodied children. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURE: Isometric plantarflexor strength. RESULTS: The reliability of isometric strength measurements of plantarflexors taken in the SMC was excellent for both the adult and children groups (intraclass correlation coefficient range, .84-.87). A Bland-Altman 95% limit of agreement test showed no systematic variation in 3 of the 4 SMC test observations; systematic variation was only observed in the adult group at a knee position of 30 degrees. There was no systematic difference in the adult group between the SMC and the isokinetic dynamometer, but there was a systematic variation in the children's group. CONCLUSIONS: The SMC reliably measured isometric plantarflexor strength in the tested populations.
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