Portable Inertial Motion Unit for Continuous Assessment of In-shoe Foot Movement
Open accessAbstract
The validity and reliability of a new prototype (PT) to measure tibio-calcaneal eversion/inversion, internal/external rotation, and plantar/dorsiflexion angle during running were investigated. Design. Test-retest measurements by a 3D accelerometer and gyroscope inertial motion unit (IMU) were compared to a motion capture (MC) based system both capturing in-shoe rearfoot and tibia kinematics. Background. Laboratory running tests may not reflect movement characteristics experienced during outdoor training. Lower extremity running kinematics have not been obtained by 3D IMU measurement within the shoe previously. Methods. 3D motion of two IMUs attached to the tibia and calcaneus, as well as retroreflective markers through windows in the running shoes, were determined during running. Intersegmental motion was extracted by a complementary filter fusing accelerometer data with integrated gyroscope angular velocity. PT measurements for motion along main anatomical axes were similar to MC derived curves based on coefficients of multiple correlation. Intraclass correlation correlations (ICC) showed a low correlation between PT and MC in three out of four parameters, but high repeatability for PT between test and retest measures. PT underestimated angular motion with a root mean square error (RMSe) of 182.5°/s and bias of 176.3°/s. Eversion was underestimated by PT with RMSe of 6.3°. The PT method was found inadequate to determine valid tibio-calcaneal motion while it was reliable for repeated tests and may allow for intra-subject comparisons of different footwear or inserts.
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Ankle intra- and inter-rater reliability varied across movement complexity (better for walking ICC 0.6 to 0.95 than jumping ICC 0.39 to 0.99 or playing soccer ICC 0.28 to 0.79).
“Intra- and inter-rater reliability varied across movements complexity (better for walking [ICC of 0.6 to 0.95] than jumping [ICC of 0.39 to 0.99] or playing soccer [ICC of 0.28 to 0.79] [29,53,62]).”
From Validity and Reliability of Wearable Sensors for Joint Angle Estimation: A Systematic Review (2019) · cites this paper as [62]
Ecological tasks related to activities of daily living generally require complex movements, the use of both upper and lower limb joints, movements in more than one plane, and irregular movement speed, which all drastically affect M/IMU system performance.
“Indeed, ecological tasks related to activities of daily living generally require complex movements, the use of both upper and lower limb joints, movements in more than one plane, and irregular movement speed, which all drastically affect system performance (e.g., walking at different speed vs. running [62,63]).”
From Validity and Reliability of Wearable Sensors for Joint Angle Estimation: A Systematic Review (2019) · cites this paper as [62]
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- Authors
- Mifsud, N. L., Kristensen, N. H., Villumsen, M., Hansen, J., & Kersting, U. G.
- Affiliations
- Aalborg University (DK)
- Corresponding author
- Kersting, Uwe G.
- Venue
- Procedia Engineering
- Publisher
- Elsevier BV
- Published
- 2014
- Volume
- 72
- Pages
- 208-213
- ISSN
- 1877-7058 (ISSN-L)
- OpenAlex
- W1994561567
- Cited by
- 16
- References
- 16
- Citations by year
- 2026: 1 · 2022: 4 · 2021: 3 · 2020: 2 · 2019: 2 · 2018: 2 · 2017: 1 · 2016: 1
- FWCI
- 1.29
- Type
- conference paper
- Language
- en
- Open access
- diamond
- doi.org
- Licence
- Locations
- Procedia Engineering (publishedVersion, cc-by-nc-nd)
- VBN Forskningsportal (Aalborg Universitet) (submittedVersion, other-oa)
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Lower Extremity Biomechanics and Pathologies
- Physical Sciences › Engineering › Aerospace Engineering › Inertial Sensor and Navigation
- Physical Sciences › Engineering › Biomedical Engineering › Sports Dynamics and Biomechanics
- Keywords
- inertial motion units, running kinematics, complementary filter, motion capture comparison, test-retest reliability, wearable sensors
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