One-minute Sit-to-stand Test Is Practical to Assess and Follow the Muscle Weakness in Cystic Fibrosis.
Abstract Background: Quadriceps muscle weakness and reduced exercise tolerance are prevalent in patients with cystic fibrosis (CF) and associated with a worse prognosis. The one-minute sit-to-stand test (1STST) has been proposed to evaluate exercise capacity and assess quadriceps strength. The aim of the study was to correlate the 1STST and the maximal isometric voluntary contraction of the quadriceps (MVCQ) evaluated by the dynamometer in stable patients with CF and to evaluate the impact of intravenous (IV) antibiotherapy.Methods: MVCQ and exercise capacity (dynamometer and 1STST) were measured in stable patients with CF at a routine visit, at the admission and the discharge of an IV antibiotherapy. Patients wore an activity monitor during 72h during IV treatment. Results: 51 stable patients with CF at a routine visit and 30 treated with IV antibiotherapy were recruited. In stable patients, the number of repetitions was reduced to 2101nxkg±657 (mean±SD), representing 79% of the predicted values (%PV) (7;142) (median (min;max)) as well as the MVCQ to 78.64N-m (23.21;170.34), representing 57%PV±26. The 1STST was correlated to MVCQ (r=0.536;p<0.0001) and lung function (r=0.508;p=0.0001). Over the IV antibiotherapy course, the 1STST improves significantly like lung function and body mass index while a positive trend for MVCQ was observed. The gain of 1STST was correlated to the change in MVCQ (r=0.441;p=0.015) and was significantly higher in hospitalized patients versus home therapy.Conclusions: The 1STST is a good alternative to the dynamometer to evaluate and assess muscular weakness for the routine visit and IV antibiotherapy.