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 > Sport, Exercise and Rehabilitation
Depositing User:	Paul Burns
Date Deposited:	12 Dec 2014 16:08
Last Modified:	12 Oct 2019 16:26
URI:	http://nrl.northumbria.ac.uk/id/eprint/18492

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