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Background: Muscle power assessed by isokinetic dynamometers has the potential for playing an important role in investigating functional status in older subjects. Researchers and clinicians are interested in the reliability of isokinetic test protocols for the confidential assessment of status, as this affects the interpretation of the results of an intervention program. Objective: The current study investigated the inter- and intrarater reliability of an isokinetic strength-testing protocol of the knee and ankle preceded by a familiarization session. Methods: Twenty-four independently living elderly subjects (6 males, 18 females, mean age 71.2 ± 5.5 years) were assessed 3 times in two test sessions. The main outcomes were the intraclass correlation coefficient, standard error of measurements (SEM) and ratio of limits of agreement (RLOA) for isokinetic knee and ankle contractions, as measured with the Biodex System …