Reproducibility of maximal quadriceps strength and its relationship to maximal voluntary activation in postpoliomyelitis syndrome1  Herwin L Horemans, MSc, Anita Beelen, PhD, Frans Nollet, MD, PhD, David A Jones, PhD, Gustaaf J Lankhorst, MD, PhD  Archives of Physical Medicine and Rehabilitation  Volume 85, Issue 8, Pages 1273-1278 (August 2004) DOI: 10.1016/j.apmr.2003.10.026

Fig 1 Measurements of MVC torque and MVA. (A) The MVC torque is determined as the highest peak torque of 3 trials. (B) MVA is calculated from the increment in torque produced by stimulation during an MVC (a) and the torque due to control stimulation (b) as (1−a/b)×100. MVCSTIM is the voluntary torque at the start of stimulation. Archives of Physical Medicine and Rehabilitation 2004 85, 1273-1278DOI: (10.1016/j.apmr.2003.10.026)

Fig 2 Bland-Altman plots of repeated measures of (A) MVC torque and (B) MVA. Original data are presented. The solid line represents the mean difference (the second visit minus the first visit), the dotted lines represent the 95% limits of agreement. The limits of agreement for MVC torque are expressed as ratios. Archives of Physical Medicine and Rehabilitation 2004 85, 1273-1278DOI: (10.1016/j.apmr.2003.10.026)

Fig 3 The difference in MVA between visits is plotted against the difference in MVCSTIM torque. The difference in MVA is calculated from the score on the second visit minus the score on the first visit. The difference in MVCSTIM torque is expressed as the percentage of change from the first visit. The squared correlation coefficient (r2) indicates the variance in MVCSTIM torque that is explained by the variance in MVA. Archives of Physical Medicine and Rehabilitation 2004 85, 1273-1278DOI: (10.1016/j.apmr.2003.10.026)