Skervin, Timmion K., Thomas, Neil M., Schofield, Andrew J., Hollands, Mark A., Maganaris, Constantinos N., O’Brien, Thomas D., Baltzopoulos, Vasilios and Foster, Richard J. (2023). Accuracy and Precision of a Novel Photogate System to Measure Toe Clearance on Stairs. Sensors, 23 (5),
Abstract
Background: Toe clearance on stairs is typically measured using optoelectronic systems, though these are often constrained to the laboratory, due to their complex setups. Here we measured stair toe clearance through a novel prototype photogate setup and compared this to optoelectronic measurements. Methods: Twelve participants (age 22 ± 3 years) completed 25 stair ascent trials, each on a seven-step staircase. Toe clearance over the fifth step edge was measured using Vicon and the photogates. Twenty-two photogates were created in rows through laser diodes and phototransistors. The height of the lowest photogate broken at step-edge crossing was used to determine photogate toe clearance. A limits of agreement analysis and Pearson’s correlation coefficient compared the accuracy, precision and relationship between systems. Results: We found a mean difference of −1.5 mm (accuracy) between the two measurement systems, with upper and lower limits (precision) of 10.7 mm and −13.8 mm, respectively. A strong positive correlation was also found (r = 70, n = 12, p = 0.009) between the systems. Discussion: The results suggest that photogates could be an option for measuring real-world stair toe clearances, where optoelectronic systems are not routinely used. Improvements to the design and measurement factors may help to improve the precision of the photogates.
Publication DOI: | https://doi.org/10.3390/s23052429 |
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Divisions: | College of Health & Life Sciences > School of Psychology College of Health & Life Sciences > Aston Institute of Health & Neurodevelopment (AIHN) College of Health & Life Sciences Aston University (General) |
Additional Information: | Copyright © 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Funding: This research was funded by a Liverpool John Moores University (UK) PhD scholarship. |
Uncontrolled Keywords: | optoelectronic,photogates,stair safety,toe clearance,Analytical Chemistry,Information Systems,Biochemistry,Atomic and Molecular Physics, and Optics,Instrumentation,Electrical and Electronic Engineering |
Publication ISSN: | 1424-8220 |
Last Modified: | 02 Dec 2024 08:50 |
Date Deposited: | 06 Mar 2023 13:44 |
Full Text Link: | |
Related URLs: |
https://www.mdp ... -8220/23/5/2429
(Publisher URL) http://www.scop ... tnerID=8YFLogxK (Scopus URL) |
PURE Output Type: | Article |
Published Date: | 2023-03 |
Published Online Date: | 2023-02-22 |
Accepted Date: | 2023-02-12 |
Authors: |
Skervin, Timmion K.
Thomas, Neil M. Schofield, Andrew J. ( 0000-0002-0589-4678) Hollands, Mark A. Maganaris, Constantinos N. O’Brien, Thomas D. Baltzopoulos, Vasilios Foster, Richard J. |