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Validity of Instrumented 360° Turn Test in Older Adults with Cognitive Impairment
Ellen L McGough1, Molly Gries1, Linda Teri2
1Department of Rehabilitation Medicine, University of Washington, Seattle, Washington, USA.
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.
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