1. Reliability and criterion-related validity with a smartphone used in timed-up-and-go test
- Author
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Alejandro Galán-Mercant, Antonio Cuesta-Vargas, Francisco Javier Barón-López, and Maria Teresa Labajos-Manzanares
- Subjects
Engineering ,Movement ,Acceleration ,Biomedical Engineering ,Monitoring, Ambulatory ,Kinematics ,Timed Up and Go test ,Walking ,Accelerometer ,Inertial sensor ,Biomaterials ,Gait (human) ,iPhone ,Validation ,Criterion validity ,Humans ,Radiology, Nuclear Medicine and imaging ,Multiple correlation ,Older adult ,Gait ,Postural Balance ,Reliability (statistics) ,Simulation ,Aged ,Radiological and Ultrasound Technology ,Anthropometry ,business.industry ,Research ,Reproducibility of Results ,General Medicine ,Equipment Design ,Test (assessment) ,Biomechanical Phenomena ,Cross-Sectional Studies ,Exercise Test ,Smartphone ,business ,Cell Phone - Abstract
Background: The capacity to diagnosys, quantify and evaluate movement beyond the general confines of a clinical environment under effectiveness conditions may alleviate rampant strain on limited, expensive and highly specialized medical resources. An iPhone 4® mounted a three dimensional accelerometer subsystem with highly robust software applications. The present study aimed to evaluate the reliability and concurrent criterion-related validity of the accelerations with an iPhone 4® in an Extended Timed Get Up and Go test. Extended Timed Get Up and Go is a clinical test with that the patient get up from the chair and walking ten meters, turn and coming back to the chair. Methods: A repeated measure, cross-sectional, analytical study. Test-retest reliability of the kinematic measurements of the iPhone 4® compared with a standard validated laboratory device. We calculated the Coefficient of Multiple Correlation between the two sensors acceleration signal of each subject, in each sub-stage, in each of the three Extended Timed Get Up and Go test trials. To investigate statistical agreement between the two sensors we used the Bland-Altman method. Results: With respect to the analysis of the correlation data in the present work, the Coefficient of Multiple Correlation of the five subjects in their triplicated trials were as follows: in sub-phase Sit to Stand the ranged between r =0.991 to 0.842; in Gait Go, r =0.967 to 0.852; in Turn, 0.979 to 0.798; in Gait Come, 0.964 to 0.887; and in Turn to Stand to Sit, 0.992 to 0.877. All the correlations between the sensors were significant (p
- Published
- 2014