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  • Title: Does choice of angular velocity affect pain level during isokinetic strength testing of knee osteoarthritis patients?
    Author: Almosnino S, Brandon SC, Sled EA.
    Journal: Eur J Phys Rehabil Med; 2012 Dec; 48(4):569-75. PubMed ID: 22713541.
    Abstract:
    BACKGROUND: Thigh musculature strength assessment in individuals with knee osteoarthritis is routinely performed in rehabilitative settings. A factor that may influence results is pain experienced during testing. AIM: To assess whether pain experienced during isokinetic testing in individuals with knee osteoarthritis is dependent on the angular velocity prescribed. DESIGN: Experimental, repeated measures. SETTING: University laboratory. POPULATION: Thirty-five individuals (19 women, 16 men) with tibiofemoral osteoarthritis. METHODS: Participants performed three randomized sets of five maximal concentric extension-flexion repetitions at 60°/s, 90°/s and 120°/s. Pain intensity was measured immediately after the completion of each set. Strength outcomes for each set were the average peak moment. RESULTS: Across gender, pain level was not significantly affected by testing velocity (P=0.18, η(p)(2) =0.05). There was a trend of women reporting more pain than men across all testing velocities, however this comparison did not reach statistical significance (P=0.18, η(p)(2)=0.05). There was a significant main effect of testing velocity on strength, with the highest level attained at 60°/s. However, no difference in strength was noted when testing was performed at 90°/s or 120°/s. CONCLUSION: A large variation in pain scores within and across conditions and gender was noted, suggesting that at the current stage: 1) isokinetic angular velocity prescription be performed on an individual patient basis; and 2) improvements in the manner pain is recorded are needed in order to reduce the variations in pain scores. CLINICAL REHABILITATION IMPACT: Individual prescription of angular velocity may be necessary for optimal strength output and reduction of pain during effort exertion in this patient population.
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