Detection of Ground Contact Times with Inertial Sensors in Elite 100-m Sprints under Competitive Field Conditions

This study describes a method for extracting the stride parameter ground contact time (GCT) from inertial sensor signals in sprinting. Five elite athletes were equipped with inertial measurement units (IMU) on their ankles and performed 34 maximum 50 and 100-m sprints. The GCT of each step was estim...

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Autores principales:	Patrick Blauberger, Alexander Horsch, Martin Lames
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	running sprinting contact time sports analytics inertial sensors (IMU) field application Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/c830822f44a747acbd9c8e5d14df8e5a
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spelling	oai:doaj.org-article:c830822f44a747acbd9c8e5d14df8e5a2021-11-11T19:16:38ZDetection of Ground Contact Times with Inertial Sensors in Elite 100-m Sprints under Competitive Field Conditions10.3390/s212173311424-8220https://doaj.org/article/c830822f44a747acbd9c8e5d14df8e5a2021-11-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/21/7331https://doaj.org/toc/1424-8220This study describes a method for extracting the stride parameter ground contact time (GCT) from inertial sensor signals in sprinting. Five elite athletes were equipped with inertial measurement units (IMU) on their ankles and performed 34 maximum 50 and 100-m sprints. The GCT of each step was estimated based on features of the recorded IMU signals. Additionally, a photo-electric measurement system covered a 50-m corridor of the track to generate ground truth data. This corridor was placed interchangeably at the first and the last 50-ms of the track. In total, 863 of 889 steps (97.08%) were detected correctly. On average, ground truth data were underestimated by 3.55 ms. The root mean square error of GCT was 7.97 ms. Error analyses showed that GCT at the beginning and the end of the sprint was classified with smaller errors. For single runs the visualization of step-by-step GCT was demonstrated as a new diagnostic instrument for sprint running. The results show the high potential of IMUs to provide the temporal parameter GCT for elite-level athletes.Patrick BlaubergerAlexander HorschMartin LamesMDPI AGarticlerunningsprintingcontact timesports analyticsinertial sensors (IMU)field applicationChemical technologyTP1-1185ENSensors, Vol 21, Iss 7331, p 7331 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	running sprinting contact time sports analytics inertial sensors (IMU) field application Chemical technology TP1-1185
spellingShingle	running sprinting contact time sports analytics inertial sensors (IMU) field application Chemical technology TP1-1185 Patrick Blauberger Alexander Horsch Martin Lames Detection of Ground Contact Times with Inertial Sensors in Elite 100-m Sprints under Competitive Field Conditions
description	This study describes a method for extracting the stride parameter ground contact time (GCT) from inertial sensor signals in sprinting. Five elite athletes were equipped with inertial measurement units (IMU) on their ankles and performed 34 maximum 50 and 100-m sprints. The GCT of each step was estimated based on features of the recorded IMU signals. Additionally, a photo-electric measurement system covered a 50-m corridor of the track to generate ground truth data. This corridor was placed interchangeably at the first and the last 50-ms of the track. In total, 863 of 889 steps (97.08%) were detected correctly. On average, ground truth data were underestimated by 3.55 ms. The root mean square error of GCT was 7.97 ms. Error analyses showed that GCT at the beginning and the end of the sprint was classified with smaller errors. For single runs the visualization of step-by-step GCT was demonstrated as a new diagnostic instrument for sprint running. The results show the high potential of IMUs to provide the temporal parameter GCT for elite-level athletes.
format	article
author	Patrick Blauberger Alexander Horsch Martin Lames
author_facet	Patrick Blauberger Alexander Horsch Martin Lames
author_sort	Patrick Blauberger
title	Detection of Ground Contact Times with Inertial Sensors in Elite 100-m Sprints under Competitive Field Conditions
title_short	Detection of Ground Contact Times with Inertial Sensors in Elite 100-m Sprints under Competitive Field Conditions
title_full	Detection of Ground Contact Times with Inertial Sensors in Elite 100-m Sprints under Competitive Field Conditions
title_fullStr	Detection of Ground Contact Times with Inertial Sensors in Elite 100-m Sprints under Competitive Field Conditions
title_full_unstemmed	Detection of Ground Contact Times with Inertial Sensors in Elite 100-m Sprints under Competitive Field Conditions
title_sort	detection of ground contact times with inertial sensors in elite 100-m sprints under competitive field conditions
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/c830822f44a747acbd9c8e5d14df8e5a
work_keys_str_mv	AT patrickblauberger detectionofgroundcontacttimeswithinertialsensorsinelite100msprintsundercompetitivefieldconditions AT alexanderhorsch detectionofgroundcontacttimeswithinertialsensorsinelite100msprintsundercompetitivefieldconditions AT martinlames detectionofgroundcontacttimeswithinertialsensorsinelite100msprintsundercompetitivefieldconditions
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Detection of Ground Contact Times with Inertial Sensors in Elite 100-m Sprints under Competitive Field Conditions

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