Spiroergometric studies in diseases of the muscles

37 patients with muscle disease (23 myopathies and 14 neurogenic muscle diseases) were studied by spiroergometric investigations. The multivariate analysis of variance (MA-NOVA) and linear discriminant analyses indicated the diagnostic effectiveness of the maximal work capacity/maximal cardiac frequency ratio. The sensitivity was found to be 0.81 and the specificity was found to be 0.43.