Evaluation of the Accuracy of a Triaxial Accelerometer Embedded into a Cell Phone Platform for Measuring Physical Activity.
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Date
2013-06-04
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Abstract
BACKGROUND Physical activity is important in health and weight management Several cell phone platforms integrate an accelerometer onto the motherboard Here we tested the validity of the cell phone accelerometer to assess physical activity in a controlled laboratory setting METHODS 31 subjects wore the cell phone on their waist along with the validated Physical Activity Monitoring System PAMS with different body postures and during graded walking Energy expenditure was measured using indirect calorimetry 11 subjects also wore the iPhone at different locations such as arm hand pant pocket etc RESULTS The cell phone accelerometer was accurate and precise compared to the PAMS with an intra class correlation coefficient r 2 0 98 The cell phone accelerometer showed excellent sequential increases with increased in walking velocity and energy expenditure r 2 0 9 CONCLUSION An accelerometer embedded into a cell phone was accurate and reliable in measuring and quantifying physical activity in the laboratory setting Data from free living users shows promise for deployment of a comprehensive integrated physical activity promoting and weight loss platform using such mobile technologies
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Keywords
Accelerometers / Motion sensors, Raw data, Surveillance, Data collection and reporting, Functionality