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The measurement of physical fitness of lower limb amputees is difficult as the commonly used ergometer tests have limitations. A combined arm-leg (Cruiser) ergometer might be valuable. The aim of this study was to establish the repeatability and validity of the combined arm-leg (Cruiser) ergometer. Thirty healthy volunteers performed three incremental exercise tests, once on the bicycle ergometer and twice on the Cruiser ergometer. The repeatability of the Cruiser ergometer was assessed by studying the means of the test-retest and the validity by studying the means of the bicycle and the two Cruiser ergometer tests. Intraclass Correlation Coefficient (ICC) for repeated measurements on the Cruiser ergometer was 0.84 for the maximal oxygen consumption (VO2 max) and 0.71 for the maximal heart rate (HR max). ICC for the measurements on the bicycle ergometer and the Cruiser ergometer was 0.86 for the VO2 max and 0.73 for HR max. Bland and Altman plots for VO2 max and HR max showed a bias close to zero and a great accuracy. The conclusion of this study is that the Cruiser ergometer provides a repeatable and valid measurement of the physical fitness in healthy volunteers. Its value in clinical practice for lower limb amputees needs further to be established.
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