Estimating effective contact and flight times using a sacral-mounted inertial measurement unit.

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License: CC BY 4.0
Serval ID
serval:BIB_1FA350B8A952
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Estimating effective contact and flight times using a sacral-mounted inertial measurement unit.
Journal
Journal of biomechanics
Author(s)
Patoz A., Lussiana T., Breine B., Gindre C., Malatesta D.
ISSN
1873-2380 (Electronic)
ISSN-L
0021-9290
Publication state
Published
Issued date
31/07/2021
Peer-reviewed
Oui
Volume
127
Pages
110667
Language
english
Notes
Publication types: Journal Article
Publication Status: aheadofprint
Abstract
Effective ground contact (t <sub>ce</sub> ) and flight (t <sub>fe</sub> ) times were proven to be more appropriate to decipher the landing-take-off asymmetry of running than usual ground contact (t <sub>c</sub> ) and flight (t <sub>f</sub> ) times. To measure these effective timings, force plate is the gold standard method (GSM), though not very portable overground. In such situation, alternatives could be to use portable tools such as inertial measurement unit (IMU). Therefore, the purpose of this study was to propose a method that uses the vertical acceleration recorded using a sacral-mounted IMU to estimate t <sub>ce</sub> and t <sub>fe</sub> and to compare these estimations to those from GSM. Besides, t <sub>ce</sub> and t <sub>fe</sub> were used to evaluate the landing-take-off asymmetry, which was further compared to GSM. One hundred runners ran at 9, 11, and 13 km/h. Force data (200 Hz) and IMU data (208 Hz) were acquired by an instrumented treadmill and a sacral-mounted IMU, respectively. The comparison between GSM and IMU method depicted root mean square error ≤22 ms (≤14%) for t <sub>ce</sub> and t <sub>fe</sub> along with small systematic biases (≤20 ms) for each tested speed. These errors are similar to previously published methods that estimated usual t <sub>c</sub> and t <sub>f</sub> . The systematic biases on t <sub>ce</sub> and t <sub>fe</sub> were subtracted before calculating the landing-take-off asymmetry, which permitted to correctly evaluate it at a group level. Therefore, the findings of this study support the use of this method based on vertical acceleration recorded using a sacral-mounted IMU to estimate t <sub>ce</sub> and t <sub>fe</sub> for level treadmill runs and to evaluate the landing-take-off asymmetry but only after subtraction of systematic biases and at a group level.
Keywords
Biophysics, Rehabilitation, Orthopedics and Sports Medicine, Biomedical Engineering, Accelerometer, Biomechanics, Gait analysis, Running, Sensor
Pubmed
Open Access
Yes
Create date
02/08/2021 8:14
Last modification date
25/08/2021 6:37
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