Test-retest reliability of three strategies to measure quadriceps muscle endurance in people with COPD

• Despite its clinical relevance, there is no consensus on how to measure quadriceps muscle endurance in people with COPD. Moreover, the reliability of available measurement strategies are only partly known.Aim: To determine test-retest reliability and feasibility of isokinetic, isometric and isotonic protocols to assess quadriceps muscle endurance in people with COPD.Method: Fifty nine participants (FEV1 of predicted 55±18%, age 67±8 years) were included and tested in an interday multicentre test-retest design with test occasions separated by 5-9 days. Quadriceps muscle endurance was assessed using isokinetic, isometric and isotonic knee extension protocols controlled by a computerized dynamometer. Relative reliability was determined by intra-class correlation coefficient (ICC)( two-way mixed effects, absolute agreement, single measurement) and absolute reliability by standard error of measurement (SEM).Result: Isokinetic measurements demonstrated very high relative reliability (ICC: [95% confidence interval] 0.97 [0.94-0.99]), and isometric and isotonic demonstrated high relative reliability (0.89 [0.79-0.94], and 0.89 [0.82-0.94], respectively). Mean values across test-retest occasions were 2122 joules, 49 seconds, and 29 repetitions, for isokinetic, isometric and isotonic measurements, respectively. Corresponding SEM values were 150 joules, 7 seconds, and 5 repetitions. All three measurement strategies were feasible with an average time consumption of less than 10 minutes and no major adverse events.Conclusion: The results indicate that isokinetic, isotonic and isometric measurements of quadriceps muscle endurance are reliable and feasible in people with COPD.

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MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Lungmedicin och allergi (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Respiratory Medicine and Allergy (hsv//eng)

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