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Matters arising of left shoulder abduction. My third concern with the study is that the authors' results differ from those I have obtained and reported elsewhere.4 Although the authors' work is, in many more ways, more comprehensive than my own, the two issues addressed above (correction for gravity and prevention of substitution) were controlled in my paper. The result of my study of knee extension was that relative endurance, which the authors seem also to be testing, was better in patientsdoi:10.1136/jnnp.50.11.1563 fatcat:2sd4d67oxfa35ij4zk2uy5gic4