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Reliability of a new instrument for measuring plantarflexor muscle strength
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-5417-5939
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2007 (English)In: Archives of Physical Medicine and Rehabilitation, ISSN 0003-9993, E-ISSN 1532-821X, Vol. 88, no 9, 1164-1170 p.Article in journal (Refereed) Published
Abstract [en]

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 plantar-flexors 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.

Place, publisher, year, edition, pages
2007. Vol. 88, no 9, 1164-1170 p.
Keyword [en]
gastrocnemius muscle, isometric contraction, rehabilitation, reproducibility of results, soleus muscle, hand-held dynamometry, interrater reliability, isokinetic dynamometer, cerebral-palsy, children, torque, knee, activation, arthritis, velocity
National Category
Medical Engineering
URN: urn:nbn:se:kth:diva-16948DOI: 10.1016/j.apmr.2007.05.028ISI: 000249350300013PubMedID: 17826463ScopusID: 2-s2.0-34548388466OAI: diva2:334991
Conference of the European-Society-of-Movement-Analysis-for-Adult-and-Children Location: Amsterdam, Australia, Date: SEP, 2006 Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-09-12Bibliographically approved

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Gutierrez-Farewik, Elena M.Farewik, Markus
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