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- Bäcklund, Tomas,1958-Umeå universitet,Radiofysik (author)
Single sensor measurement of heel-height during the push-off phase of gait
- Article/chapterEnglish2021
Publisher, publication year, extent ...
- 2021-11-26
- Institute of Physics (IOP),2021
- electronicrdacarrier
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- LIBRIS-ID:oai:DiVA.org:umu-182776
- https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-182776URI
- https://doi.org/10.1088/1361-6579/ac325cDOI
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- Language:English
- Summary in:English
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- SwePubSwePub
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- Previously included in thesis in manuscript form.
- Objective: In healthy gait a forceful push-off is needed to get an efficient leg swing and propulsion, and a high heel lift makes a forceful push-off possible. The power of the push-off is decreased with increased age and in persons with impaired balance and gait. The aim of this study was to evaluate whether a wearable equipment (Striton) and algorithms to estimate vertical heel-height during gait from a single optical distance sensor is reliable and feasible for clinical applications.Approach: To assess heel-height with the Striton system an optical distance sensor was used to measure the distance to the floor along the shank. An algorithm was created to transform this measure to a vertical distance. The heel-height was validated in an experimental setup, against a 3D motion capture system (MCS), and test-retest and day-to-day tests were performed on 10 elderly persons. As a reference material 83 elderly persons were included, and heel-height was measured before and after surgery in four patients with the neurological disorder idiopathic normal pressure hydrocephalus (iNPH).Main results: In the experimental setup the accuracy was high with a maximum error of 2% at all distances, target colours and inclination angles, and the correlation to the MCS was R = 0.94. Test-retest and day-to-day tests were equal within ±1.2 cm. Mean heel-height of the elderly persons was 16.5 ± 0.6 cm and in the patients with iNPH heel-height was increased from 11.2 cm at baseline to 15.3 cm after surgery.Significance: Striton can reliably measure heel-height during gait, with low test-retest and day-to-day variability. The system was easy to attach, and simple to use, which makes it suitable for clinical applications.
Subject headings and genre
- TEKNIK OCH TEKNOLOGIER Medicinteknik hsv//swe
- ENGINEERING AND TECHNOLOGY Medical Engineering hsv//eng
- heel-height
- optical sensor
- heel-height variability
- push-off phase
- medical informatics
- medicinsk informatik
Added entries (persons, corporate bodies, meetings, titles ...)
- Grip, HelenaUmeå universitet,Radiofysik(Swepub:umu)heagrp96 (author)
- Öhberg, Fredrik,1969-Umeå universitet,Radiofysik(Swepub:umu)froh0003 (author)
- Sundström, NinaUmeå universitet,Radiofysik(Swepub:umu)nian0004 (author)
- Umeå universitetRadiofysik (creator_code:org_t)
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- In:Physiological Measurement: Institute of Physics (IOP)42:100967-33341361-6579
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