Validity of Instrumented 360° Turn Test in Older Adults with Cognitive Impairment

Abstract

Aims: To examine concurrent and construct validity of inertial sensor 360° turn measures in relation with motion capture and mobility assessments in cognitively impaired older adults.

Methods: Data was collected in 31 participants, mean age 85.2 (SD 5.2), during clockwise (CW) and counter clockwise (CCW) 360° turns using (1) APDM body-worn inertial sensors and (2) Qualisys 8-camera laboratory-based motion capture.

Results: Absolute agreement between inertial sensor and motion capture measures was excellent for turn duration and turn peak velocity (ICC = 0.96–0.98). Strong to moderate correlations were present between inertial sensor turn measures and performance on the Timed Up and Go, Short Physical Performance Battery and 90-s Balance Test. ROC curve analysis of CCW 360° turn duration and turn peak velocity distinguished higher risk versus lower risk for mobility disability.

Conclusions: Inertial sensor 360° turn measures demonstrated concurrent and construct validity in relation to motion capture and mobility assessments.

Keywords:

• Inertial sensors
• turns
• older adults
• cognitive impairment
• mobility disability

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This study was funded by the National Institutes of Health/National Institute on Aging: Northwest Roybal Center: Improving Healthcare for Cognitively Impaired Elders and Their Caregivers (P.I. Linda Teri, PhD; P30 AGO34592-03). Data for this study was managed with REDCap (Research Electronic Data Capture) at ITHS, supported by the National Center For Advancing Translational Sciences of the National Institutes of Health under Award Number UL1 TR002319.