Fig. 1

Correlation between the 1STST and FEV1 or MVCQ in the stable CF population. A Correlation between the 1STST expressed as a product of the bodyweight and the MVCQ expressed in Newton-meter, in the stable CF population. B Correlation between the 1STST expressed as a product of the bodyweight and the MVCQ expressed in percentage of the predicted values, in the stable CF population. C Correlation between the 1STST expressed as a product of the bodyweight and the FEV1 expressed in percentage of the predicted values, in the stable CF population. Correlation values were determined by Pearson test if parametric (B, C) and by Spearman test if non-parametric data (A). N = 51. Definition of abbreviations: 1STST, one-minute sit-to-stand test; nxkg, number of repetitions as a product of bodyweight expressed in kilogram; MVCQ, maximal isometric voluntary contraction of the quadriceps; N-m Newton-meter; PV, predicted values; FEV1, forced expiratory volume in one second; CF, cystic fibrosis; N, number of patients