A Comparison of Methods to Detect Postural Transitions Using a Single Tri-Axial Accelerometer

Godfrey, Alan, Barry, Gillian, Mathers, John and Rochester, Lynn (2014) A Comparison of Methods to Detect Postural Transitions Using a Single Tri-Axial Accelerometer. In: EMBC’14 - 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 26th - 30th August 2014, Illinois, USA.

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Abstract

Two algorithms for evaluating postural transitions (PTs) in cohorts of 40 healthy younger and 40 older adults are described and evaluated. The time of sit-to-stand (SiSt) and stand-to-sit (StSi) transitions and their duration were measured with two tri-axial accelerometers, one on the chest and one on the lower back. Each algorithm was optimized for these sensor placements. The first algorithm for sensor placement on the chest used a scalar product and vertical velocity estimates. The second algorithm for sensor placement on the lower back used a vector magnitude and a discrete wavelet transform. Both algorithms performed excellently in PT classification for younger and older adults (>86%). However, the chest based sensor and algorithm were better for estimating transition duration (TD) with ICCs to video analysis ranging from 0.678 to 0.969.

Item Type: Conference or Workshop Item (Paper)
Subjects: B800 Medical Technology
B900 Others in Subjects allied to Medicine
Department: Faculties > Health and Life Sciences > School of Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: Paul Burns
Date Deposited: 12 Dec 2014 16:08
Last Modified: 10 Aug 2015 11:27
URI: http://nrl.northumbria.ac.uk/id/eprint/18492

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