P-200: Concurrent validity, test-retest reliability, and minimal detectable change of a single body-fixed-sensor to assess gait characteristics during rollator-assisted walking in geriatric patients

摘要

Introduction: In geriatric patients, gait characteristics can often be assessed only during rollator-assisted walking. Psychometric properties of body-fixed-sensors (BFSs) to assess gait characteristics under this walking condition are, however, often still unknown. This study aims to determine the concurrent validity, test—retest reliability, and minimal detectable change (MDC) of a BFS to measure gait characteristic during rollator-assisted walking in geriatric patients. Methods: The study is still in-progress. Twenty-two hospitalized geriatric patients (≥ 65 years) who were dependent on a rollator for ambulation have so far been included. Gait speed; step time, length and frequency; gait intensity and smoothness were measured during rollator-assisted walking over a 10-m walkway using the BFS (Dy-naport MoveTest, McRoberts). Concurrent validity for gait speed and step time, length and frequency was assessed against APDM's Mobility Lab. Participants completed the walkway twice with a 15-min rest period in between. Intraclass correlation coefficients (ICC2,1) were calculated to determine absolute agreement with APDM's Mobility Lab and between the test and retest. MDCs were calculated based on standard error of measurements. Results: Preliminary analyses revealed excellent absolute agreement between the BFS and the APDM's Mobility Lab (ICC2,1 = 0.871-0.914). Test-retest reliability was excellent for gait speed; step time, length and frequency; gait intensity and smoothness (ICC2,1 = 0.824-0.954). Five out of six parameters had a MDC95% of ≤ 20% (range 5.9-32.6%). Final results will be presented at the conference. Conclusion: These preliminary results suggest that the single BFS is a valid and reliable tool for measuring gait characteristics during rollator-assisted walking in geriatric patients.