Investigation of metric properties of the Londrina Activities of Daily Living Protocol in patients with idiopathic pulmonary fibrosis.

Patients with idiopathic pulmonary fibrosis (IPF) often experience a decline in activities of daily living (ADL) due to progressive lung impairment. Therefore, it is essential to evaluate ADL performance in a way that reflects real-life challenges. This study aims to investigate the metric properties of the Londrina ADL Protocol in patients with IPF. Thirty-three patients (66.7% men, age: 66.7 ± 5.2 years) participated in this observational metric analysis study. We evaluated the protocol's validity, reliability, standard error of measurement (SEM), and minimal detectable change with 95% confidence (MDC95). To assess validity, we calculated correlation coefficients between the Londrina-ADL protocol and the Glittre Test (TGlittre), the 6-Minute Walk Test (6MWT), the London Chest-ADL (LCADL) Scale, hand grip strength, knee extension strength, and respiratory functions. Intra-rater reliability was analyzed using the intraclass correlation coefficient (ICC), paired sample t-test, SEM, MDC95, and the learning effect. The Londrina-ADL protocol showed significant correlations with the TGlittre, the 6MWT, the LCADL, hand grip strength, knee extension strength, and respiratory functions (r = 0.742, r = -0.619, r = 0.665, r = -0.601, r = -0.587, p < .001, respectively.). The protocol demonstrated excellent intra-rater reliability (ICC = 0.939). Test durations differed significantly between tests (p < .001). The SEM and MDC95 values were 8.69 seconds and 24.01 seconds, respectively, with a learning effect of 4.7% observed between the first and second tests. Given its strong metric properties, the Londrina-ADL protocol may serve as a practical and sensitive tool for evaluating daily functional capacity and guiding individualized rehabilitation strategies in patients with IPF.