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Understanding the track and field sprint start through a functional analysis of the external force features which contribute to higher levels of block phase performance

Neil Bezodis Orcid Logo, Sean Walton Orcid Logo, Ryu Nagahara

Journal of Sports Sciences, Volume: 37, Issue: 5, Pages: 560 - 567

Swansea University Authors: Neil Bezodis Orcid Logo, Sean Walton Orcid Logo

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DOI (Published version): 10.1080/02640414.2018.1521713

Abstract

This study aimed to identify the continuous ground reaction force (GRF) features which contribute to higher levels of block phase performance. Twenty-three sprint-trained athletes completed starts from their preferred settings during which GRFs were recorded separately under each block. Continuous f...

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Published in: Journal of Sports Sciences
ISSN: 0264-0414 1466-447X
Published: 2019
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa43730
first_indexed 2018-09-07T12:58:58Z
last_indexed 2020-07-08T19:04:48Z
id cronfa43730
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spelling 2020-07-08T14:26:06.5486382 v2 43730 2018-09-07 Understanding the track and field sprint start through a functional analysis of the external force features which contribute to higher levels of block phase performance 534588568c1936e94e1ed8527b8c991b 0000-0003-2229-3310 Neil Bezodis Neil Bezodis true false 0ec10d5e3ed3720a2d578417a894cf49 0000-0002-6451-265X Sean Walton Sean Walton true false 2018-09-07 EAAS This study aimed to identify the continuous ground reaction force (GRF) features which contribute to higher levels of block phase performance. Twenty-three sprint-trained athletes completed starts from their preferred settings during which GRFs were recorded separately under each block. Continuous features of the magnitude and direction of the resultant GRF signals which explained 90% of the variation between the sprinters were identified. Each sprinter’s coefficient score for these continuous features was then input to a linear regression model to predict block phase performance (normalised external power). Four significant (p < 0.05) predictor features associated with GRF magnitude were identified; there were none associated with GRF direction. A feature associated with greater rear block GRF magnitudes from the onset of the push was the most important predictor (β = 1.185), followed by greater front block GRF magnitudes for the final three-quarters of the push (β = 0.791). Features which included a later rear block exit (β = 0.254) and greater front leg GRF magnitudes during the mid-push phase (β = 0.224) were also significant predictors. Sprint practitioners are encouraged, where possible, to consider the continuous magnitude of the GRFs produced throughout the block phase in addition to selected discrete values. Journal Article Journal of Sports Sciences 37 5 560 567 0264-0414 1466-447X 31 12 2019 2019-12-31 10.1080/02640414.2018.1521713 COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University 2020-07-08T14:26:06.5486382 2018-09-07T09:25:16.1988600 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Neil Bezodis 0000-0003-2229-3310 1 Sean Walton 0000-0002-6451-265X 2 Ryu Nagahara 3 0043730-07092018092656.pdf bezodis2018(2).pdf 2018-09-07T09:26:56.4770000 Output 736549 application/pdf Accepted Manuscript true 2019-10-11T00:00:00.0000000 true eng
title Understanding the track and field sprint start through a functional analysis of the external force features which contribute to higher levels of block phase performance
spellingShingle Understanding the track and field sprint start through a functional analysis of the external force features which contribute to higher levels of block phase performance
Neil Bezodis
Sean Walton
title_short Understanding the track and field sprint start through a functional analysis of the external force features which contribute to higher levels of block phase performance
title_full Understanding the track and field sprint start through a functional analysis of the external force features which contribute to higher levels of block phase performance
title_fullStr Understanding the track and field sprint start through a functional analysis of the external force features which contribute to higher levels of block phase performance
title_full_unstemmed Understanding the track and field sprint start through a functional analysis of the external force features which contribute to higher levels of block phase performance
title_sort Understanding the track and field sprint start through a functional analysis of the external force features which contribute to higher levels of block phase performance
author_id_str_mv 534588568c1936e94e1ed8527b8c991b
0ec10d5e3ed3720a2d578417a894cf49
author_id_fullname_str_mv 534588568c1936e94e1ed8527b8c991b_***_Neil Bezodis
0ec10d5e3ed3720a2d578417a894cf49_***_Sean Walton
author Neil Bezodis
Sean Walton
author2 Neil Bezodis
Sean Walton
Ryu Nagahara
format Journal article
container_title Journal of Sports Sciences
container_volume 37
container_issue 5
container_start_page 560
publishDate 2019
institution Swansea University
issn 0264-0414
1466-447X
doi_str_mv 10.1080/02640414.2018.1521713
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description This study aimed to identify the continuous ground reaction force (GRF) features which contribute to higher levels of block phase performance. Twenty-three sprint-trained athletes completed starts from their preferred settings during which GRFs were recorded separately under each block. Continuous features of the magnitude and direction of the resultant GRF signals which explained 90% of the variation between the sprinters were identified. Each sprinter’s coefficient score for these continuous features was then input to a linear regression model to predict block phase performance (normalised external power). Four significant (p < 0.05) predictor features associated with GRF magnitude were identified; there were none associated with GRF direction. A feature associated with greater rear block GRF magnitudes from the onset of the push was the most important predictor (β = 1.185), followed by greater front block GRF magnitudes for the final three-quarters of the push (β = 0.791). Features which included a later rear block exit (β = 0.254) and greater front leg GRF magnitudes during the mid-push phase (β = 0.224) were also significant predictors. Sprint practitioners are encouraged, where possible, to consider the continuous magnitude of the GRFs produced throughout the block phase in addition to selected discrete values.
published_date 2019-12-31T19:31:55Z
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score 11.04748

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