Detection of physical activity types using triaxial accelerometers

Tidsskriftartikel - 2014


BACKGROUND: The aim of this study was to validate a triaxial accelerometer setup for identi-fying everyday physical activity types i.e. sitting, standing, walking, walking stairs, running and cycling.METHODS: Seventeen subjects equipped with triaxial accelerometers (ActiGraph GT3X+) at the thigh and hip carried out a standardized test procedure including walking, running, cycling, walking stairs, sitting and standing still. A method was developed to dis-criminate between these physical activity types based on threshold values of standard devia-tion of acceleration and the derived inclination. Moreover, the ability of the accelerometer placed at the thigh to detect sitting posture was separately validated during free-living by comparison to recordings of pressure sensors in the hip pockets.RESULTS: Sensitivity for dis-criminating between the physical activity types sitting, standing, walking, running and cy-cling in the standardized trials were 99-100% and for walking stairs 95%. Specificity was higher than 99% for all activities. During free-living (140 hours of measurements) sensitivity and specificity for detection of sitting posture were 98% and 93%, respectively.CONCLUSION: The developed method for detecting physical activity types showed a high sensitivity and specificity for sitting, standing, walking, running, walking stairs, and cycling in a standardized setting, and for sitting posture during free living.


Skotte JH, Korshøj M, Kristiansen J, Hanisch C, Holtermann A. Detection of physical activity types using triaxial accelerometers. Journal of Physical Activity & Health 2014;11(1):76-84.
doi: 10.1123/jpah.2011-0347

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