Concurrent validity of accelerations measured using a tri-axial inertial measurement unit while walking on firm, compliant and uneven surfaces

Cole, Michael H., Van Den Hoorn, Wolbert, Kavanagh, Justin K., Morrison, Steven, Hodges, Paul W., Smeathers, James E. and Kerr, Graham K. (2014) Concurrent validity of accelerations measured using a tri-axial inertial measurement unit while walking on firm, compliant and uneven surfaces. PLoS One, 9 5: e98395.1-e98395.12. doi:10.1371/journal.pone.0098395


Author Cole, Michael H.
Van Den Hoorn, Wolbert
Kavanagh, Justin K.
Morrison, Steven
Hodges, Paul W.
Smeathers, James E.
Kerr, Graham K.
Title Concurrent validity of accelerations measured using a tri-axial inertial measurement unit while walking on firm, compliant and uneven surfaces
Journal name PLoS One   Check publisher's open access policy
ISSN 1932-6203
Publication date 2014-05-27
Year available 2014
Sub-type Article (original research)
DOI 10.1371/journal.pone.0098395
Open Access Status DOI
Volume 9
Issue 5
Start page e98395.1
End page e98395.12
Total pages 12
Place of publication San Francisco, CA United States
Publisher Public Library of Science
Collection year 2015
Language eng
Abstract Although accelerometers are extensively used for assessing gait, limited research has evaluated the concurrent validity of these devices on less predictable walking surfaces or the comparability of different methods used for gravitational acceleration compensation. This study evaluated the concurrent validity of trunk accelerations derived from a tri-axial inertial measurement unit while walking on firm, compliant and uneven surfaces and contrasted two methods used to remove gravitational accelerations; i) subtraction of the best linear fit from the data (detrending); and ii) use of orientation information (quaternions) from the inertial measurement unit. Twelve older and twelve younger adults walked at their preferred speed along firm, compliant and uneven walkways. Accelerations were evaluated for the thoracic spine (T12) using a tri-axial inertial measurement unit and an eleven-camera Vicon system. The findings demonstrated excellent agreement between accelerations derived from the inertial measurement unit and motion analysis system, including while walking on uneven surfaces that better approximate a real-world setting (all differences <0.16 m.s-2). Detrending produced slightly better agreement between the inertial measurement unit and Vicon system on firm surfaces (delta range: -0.05 to 0.06 vs. 0.00 to 0.14 m.s-2), whereas the quaternion method performed better when walking on compliant and uneven walkways (delta range: -0.16 to -0.02 vs. -0.07 to 0.07 m.s-2). The technique used to compensate for gravitational accelerations requires consideration in future research, particularly when walking on compliant and uneven surfaces. These findings demonstrate trunk accelerations can be accurately measured using a wireless inertial measurement unit and are appropriate for research that evaluates healthy populations in complex environments.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: UQ Centre for Clinical Research Publications
Official 2015 Collection
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 4 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Tue, 17 Jun 2014, 00:32:17 EST by System User on behalf of UQ Centre for Clinical Research