Avaliação da validade, aplicabilidade e confiabilidade do teste timed-up and go instrumentado por sensores inerciais de smartphones

Abstract

The Timed-up and go (TUG) test has been widely used by healthcare professionals to assess the risk of falls and mobility due to its practical application. Currently, the outcome of the test is evaluated by its execution time, however technological devices have been integrated into this in order to obtain other information about the execution of the execution steps, for greater accuracy of the result. In this sense, the use of inertial sensors on smartphones represents an accessible and low-cost possibility for clinical application. Based on this, the present study aims to test the validity, applicability and reliability of inertial measurements obtained by a smartphone accelerometer and gyroscope during the execution of the TUG test, as well as the replicability of data obtained at different times. To this end, quantitative survey research was carried out, with a cross-sectional and exploratory design, through three test runs using a strap with a smartphone attached to capture data from the device's inertial sensors with the Momentum Science App and the measurement of the first run with a watch. The research was carried out with 30 participants, of both sexes, with an average age of 26.96 years (± 1.5), average weight of 75.08 kg (± 16.03), average height of 1.69 m ( ± 0.099) and mean BMI of 26.02 (± 4.64). The distribution of test data was evaluated using the Kolmogorov-Smirnov test. For validation, the T test, the Pearson Correlation test and the Bland-Altman test were performed. The difference between the means was calculated at 0.46, the T test demonstrated that there was no statistically significant difference between the data (T=1.315; df=58; p= 0.19; eta squares 0.029). The correlation between the measurement obtained by the watch and the Smartphone was significant r=0.93 and the bias was not significant. To compare the measurements obtained in the three repetitions of the TUG test, an analysis of variance (ANOVA) test was performed followed by the Tukey test for normal samples and the Kruskal-Wallis test was applied followed by the Dunn test for non-normal samples. normal. In all variables extracted from the TUG, there was no statistically significant difference in the three replications. The reliability of the measurements was assessed using the intraclass correlation coefficient (ICC). Among the variables, 70% showed a moderate to excellent correlation, one showed a weak correlation and two did not obtain significant statistics. The minimum detectable change values ranged from 0.771 to 2.758.