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Coherence and reliability of a wearable inertial measurement unit for measuring postural sway

Ekvall Hansson, Eva LU and Tornberg, Åsa LU (2019) In BMC Research Notes 12(1). p.1-5
Abstract

OBJECTIVE: The aim of this study was to test the coherence of a wearable device, an inertial measurement unit (IMU) against the gold standard; also, to test the intra-trial reliability. This study has a cross-sectional design, where measurement of postural sway in the medio-lateral and anterior-posterior directions was performed simultaneously on a force plate and with a IMU called the Snubblometer ("snubbla" is stumble in Swedish). Thirty-two healthy volunteers participated in the tests.

RESULTS: The coherence between the IMU and the force plate was 0.84 (strong) in the medio-lateral direction with eyes open (EO) and 0.88 (strong) with eyes closed (EC). The ICC for intra-trial reliability for the IMU varied between 0.50 and 0.67... (More)

OBJECTIVE: The aim of this study was to test the coherence of a wearable device, an inertial measurement unit (IMU) against the gold standard; also, to test the intra-trial reliability. This study has a cross-sectional design, where measurement of postural sway in the medio-lateral and anterior-posterior directions was performed simultaneously on a force plate and with a IMU called the Snubblometer ("snubbla" is stumble in Swedish). Thirty-two healthy volunteers participated in the tests.

RESULTS: The coherence between the IMU and the force plate was 0.84 (strong) in the medio-lateral direction with eyes open (EO) and 0.88 (strong) with eyes closed (EC). The ICC for intra-trial reliability for the IMU varied between 0.50 and 0.67 (moderate to good) with a CV between 17.8 and 22.1% and ICC varied between 0.75 and 0.86 (good) for inter-trial reliability, with an SEM of 0.98 to 1.96 mm/s. We have demonstrated that the IMU was both reliable and highly coherent with golden standard, although the two assessment methods were not interchangeable. The ability to move the balance lab out into real life in the form of a wearable device will provide opportunities to perform research that has not been possible before.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
BMC Research Notes
volume
12
issue
1
pages
1 - 5
publisher
BioMed Central
external identifiers
  • scopus:85063782244
ISSN
1756-0500
DOI
10.1186/s13104-019-4238-8
language
English
LU publication?
yes
id
8aeecee2-a041-473d-af3f-d82c742356dc
date added to LUP
2019-04-10 11:24:19
date last changed
2019-07-11 03:00:27
@article{8aeecee2-a041-473d-af3f-d82c742356dc,
  abstract     = {<p>OBJECTIVE: The aim of this study was to test the coherence of a wearable device, an inertial measurement unit (IMU) against the gold standard; also, to test the intra-trial reliability. This study has a cross-sectional design, where measurement of postural sway in the medio-lateral and anterior-posterior directions was performed simultaneously on a force plate and with a IMU called the Snubblometer ("snubbla" is stumble in Swedish). Thirty-two healthy volunteers participated in the tests.</p><p>RESULTS: The coherence between the IMU and the force plate was 0.84 (strong) in the medio-lateral direction with eyes open (EO) and 0.88 (strong) with eyes closed (EC). The ICC for intra-trial reliability for the IMU varied between 0.50 and 0.67 (moderate to good) with a CV between 17.8 and 22.1% and ICC varied between 0.75 and 0.86 (good) for inter-trial reliability, with an SEM of 0.98 to 1.96 mm/s. We have demonstrated that the IMU was both reliable and highly coherent with golden standard, although the two assessment methods were not interchangeable. The ability to move the balance lab out into real life in the form of a wearable device will provide opportunities to perform research that has not been possible before.</p>},
  articleno    = {201},
  author       = {Ekvall Hansson, Eva and Tornberg, Åsa},
  issn         = {1756-0500},
  language     = {eng},
  month        = {04},
  number       = {1},
  pages        = {1--5},
  publisher    = {BioMed Central},
  series       = {BMC Research Notes},
  title        = {Coherence and reliability of a wearable inertial measurement unit for measuring postural sway},
  url          = {http://dx.doi.org/10.1186/s13104-019-4238-8},
  volume       = {12},
  year         = {2019},
}