Gait Variability Using Waist- and Ankle-Worn Inertial Measurement Units in Healthy Older Adults
Rantalainen, T., Karavirta, L., Pirkola, H., Rantanen, T., & Linnamo, V. (2020). Gait Variability Using Waist- and Ankle-Worn Inertial Measurement Units in Healthy Older Adults. Sensors, 20(10), Article 2858. https://doi.org/10.3390/s20102858
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.
Gait variability observed in step duration is predictive of impending adverse health outcomes among apparently healthy older adults and could potentially be evaluated using wearable sensors (inertial measurement units, IMU). The purpose of the present study was to establish the reliability and concurrent validity of gait variability and complexity evaluated with a waist and an ankle-worn IMU. Seventeen women (age 74.8 (SD 44) years) and 10 men (73.7 (4.1) years) attended two laboratory measurement sessions a week apart. Their stride duration variability was concurrently evaluated based on a continuous 3 min walk using a force plate and a waist- and an ankle-worn IMU. Their gait complexity (multiscale sample entropy) was evaluated from the waist-worn IMU. The force plate indicated excellent stride duration variability reliability (intra-class correlation coefficient, ICC = 0.90), whereas fair to good reliability (ICC = 0.47 to 0.66) was observed from the IMUs. The IMUs exhibited poor to excellent concurrent validity in stride duration variability compared to the force plate (ICC = 0.22 to 0.93). A good to excellent reliability was observed for gait complexity in most coarseness scales (ICC = 0.60 to 0.82). A reasonable congruence with the force plate-measured stride duration variability was observed on many coarseness scales (correlation coefficient = 0.38 to 0.83). In conclusion, waist-worn IMU entropy estimates may provide a feasible indicator of gait variability among community-dwelling ambulatory older adults. ...
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- Liikuntatieteiden tiedekunta 
Related funder(s)European Commission; Academy of Finland
Funding program(s)Research post as Academy Research Fellow, AoF; Research costs of Academy Research Fellow, AoF; Academy Project, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingRantalainen was an Academy Research Fellow during the preparation of this manuscript (Academy of Finland grant numbers 321336 and 328818). Rantanen was supported by grants of the European Research Council (grant number 693045) and the Academy of Finland (grant number 310526).
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