Associations between step duration variability and inertial measurement unit derived gait characteristics

Rantalainen, Timo, Hart, Nicholas H., Nimphius, Sophia and Wundersitz, Daniel W. 2016, Associations between step duration variability and inertial measurement unit derived gait characteristics, journal of applied biomechanics, vol. 32, no. 4, pp. 401-406, doi: 10.1123/jab.2015-0266.

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Title Associations between step duration variability and inertial measurement unit derived gait characteristics
Author(s) Rantalainen, TimoORCID iD for Rantalainen, Timo
Hart, Nicholas H.
Nimphius, Sophia
Wundersitz, Daniel W.
Journal name journal of applied biomechanics
Volume number 32
Issue number 4
Start page 401
End page 406
Total pages 6
Publisher Human Kinetics
Place of publication Champaign, Ill.
Publication date 2016-08
ISSN 1065-8483
Keyword(s) spectral analysis
inertial measurement unit
sample entropy
Summary Inertial measurement units (IMU) provide a convenient tool for gait stability assessment. However, it is unclear how various gait characteristics relate to each other and whether gait characteristics can be obtained from resultant acceleration. Therefore, step duration variability was measured in treadmill walking from 39 young ambulant volunteers (age 24.2 [± 2.5] y; height 1.79 [± 0.09] m; mass 71.6 [± 12.0] kg) using motion capture. Accelerations and gyrations were simultaneously recorded with an IMU. Harmonic ratio, maximum Lyapunov exponents, and multiscale sample entropy (MSE) were calculated. Step duration variability was positively associated with MSE with coarseness levels = 3-6 (r = -.33 to -.42, P ≤ .045). Harmonic ratio and MSE with all coarseness levels were negatively associated (r = -.45 to -.57, P ≤ .004). The MSE with coarseness level = 2 was negatively associated with short-term maximum Lyapunov exponents (r = -.32, P = .047). The agreement between resultant and vertical acceleration derived gait characteristics was excellent (ICC = 0.97-0.99). In conclusion, MSE with varying coarseness levels was associated with the other gait characteristics evaluated in the study. Resultant and vertical acceleration derived results had excellent agreement, which suggests that resultant acceleration is a viable alternative to considering the acceleration dimensions independently.
Language eng
DOI 10.1123/jab.2015-0266
Field of Research 0903 Biomedical Engineering
1106 Human Movement And Sports Science
0913 Mechanical Engineering
Socio Economic Objective 920499 Public Health (excl. Specific Population Health) not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Human Kinetics
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