Transcultural Adaptation and Psychometric Properties of a Spanish-Language Version of Physical Activity Instruments for Patients With Fibromyalgia

Abstract Munguía-Izquierdo, D, Legaz-Arrese A, Mannerkorpi K. Transcultural adaptation and psychometric properties of a Spanish-language version of physical activity instruments for patients with fibromyalgia. Objectives To develop a transcultural adaptation of the Leisure Time Physical Activity Instrument (LTPAI) and the Physical Activity at Home and Work Instrument (PAHWI) in Spanish and to assess their psychometric properties in women with fibromyalgia syndrome (FS). Design A cross-sectional transcultural adaptation and validation study. Setting Testing was completed at the university. Participants Seventy-five (N=75) women with FS (median age=51y; 25th–75th percentiles, 45–55y) and a median symptom duration of 16 years (25th–75th percentiles, 10–25y) were recruited for the study. Intervention Not applicable. Main Outcome Measures Cognitive function (Paced Auditory Serial Addition Task), physical activity habits (LTPAI, PAHWI, International Physical Activity Questionnaire [IPAQ]), and active energy expenditure using a multiple-sensor body monitor were used for the evaluations. The differences between the readings (test 1 – test 2) and the SD of the differences, intraclass correlation coefficient (ICC), 95% confidence interval (CI) for the ICC, coefficient of repeatability, intrapatient SD, standard error of the mean, minimal detectable change, Wilcoxon signed-rank test, and Bland-Altman graphs were used to examine reliability. The magnitude of the associations between LTPAI–PAHWI and IPAQ, and between LTPAI–PAHWI and the body monitoring device, were used to examine the validity of the construct. Results The median time that the study population spent performing physical activities during their leisure time was 5h/wk (25th–75th percentiles, 3–9h/wk). A satisfactory test–retest reliability was found for the total score of the LTPAI (ICC=.84; 95% CI, .76–.90) and for the workplace subscale of the PAHWI (ICC=.87; 95% CI, .81–.92). A significant association was observed between LTPAI and both the leisure time domain of the IPAQ (ρ=.61; P