Validation of Smartphone Accelerometry for the Evaluation of Sit-To-Stand Performance and Lower-Extremity Function in Older Adults

in Journal of Aging and Physical Activity
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This study tested the concurrent and construct validity of smartphone accelerometry measurement of sit-to-stand (STS) performance in individuals aged 65–89 years. Normal and fast STS times were recorded by smartphone accelerometer, force plate, and video motion systems concurrently, and isokinetic knee extension power and STS whole-body power were obtained. Normal and fast speed STS times from a smartphone accelerometer agreed closely with force plate and motion system methods (mean difference = 0.04 s). Normal and fast STS times were inversely related to isokinetic knee extension power (r = −.93, p < .001 and r = −.82, p < .001, respectively) and STS whole-body power (r = −.76, p < .001 and r = −.70, p < .001, respectively). The STS time obtained from a smartphone accelerometer was equivalent to the established, precise measures of STS time and was related to lower-extremity power, making it a potentially useful metric of lower-extremity function.

Song and LaRoche are with the Department of Kinesiology, University of New Hampshire, Durham, NH, USA. Begum is with the Department of Computer Science, University of New Hampshire, Durham, NH, USA. Arthanat is with the Department of Occupational Therapy, University of New Hampshire, Durham, NH, USA.

LaRoche (Dain.LaRoche@unh.edu) is corresponding author.
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