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Relationships between kinematic characteristics and ratio of forces during initial sprint acceleration

DANIEL KING

Swansea University Author: DANIEL KING

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Abstract

In track sprinting, the athlete generates around 70% of their maximum velocity during the initial acceleration phase (Nagahara et al., 2019a). Effective acceleration performance is largely determined by the technical ability of effectively orientating force applied to the track, quantified by the ra...

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Published: Swansea 2022
URI: https://cronfa.swan.ac.uk/Record/cronfa59441
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first_indexed 2022-02-23T12:14:29Z
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fullrecord <?xml version="1.0"?><rfc1807><datestamp>2022-02-23T12:24:45.0266037</datestamp><bib-version>v2</bib-version><id>59441</id><entry>2022-02-23</entry><title>Relationships between kinematic characteristics and ratio of forces during initial sprint acceleration</title><swanseaauthors><author><sid>f3d1fb722569777f58b3fe8b76b6d921</sid><firstname>DANIEL</firstname><surname>KING</surname><name>DANIEL KING</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2022-02-23</date><abstract>In track sprinting, the athlete generates around 70% of their maximum velocity during the initial acceleration phase (Nagahara et al., 2019a). Effective acceleration performance is largely determined by the technical ability of effectively orientating force applied to the track, quantified by the ratio of forces (RF; Morin et al., 2011). This thesis aimed to investigate the relationships between kinematic characteristics and RF during the initial acceleration phase of sprinting, as these important considerations remain unknown. Fourteen male sprinters completed two maximal 60 m sprint efforts from a block start. Whole-body kinematic data and external kinetic data were measured for the first four steps on the track. An initial analysis using semi-partial correlations (sr) determined that step-to-step variation in RF over the four steps was not related (sr = -0.280) to initial acceleration performance (normalised average horizontal external power; NAHEP), but that mean RF (RFMEAN) over these steps was strongly related to initial acceleration performance (sr = 0.683). To address the aim of this thesis, correlations with kinematic characteristics, using RFMEAN as the dependent variable, revealed that placing the stance foot further behind the whole-body centre of mass at touchdown was strongly related to high RF (r = -0.672). Specific stance leg configurations contributed to this favourable touchdown distance - a more anterior orientation (i.e., of the proximal end) of the foot and shank segments were both very strongly associated with RF (r = -0.724 and r = -0.764, respectively). Following touchdown, ankle dorsiflexion range of motion was also very strongly related to RF (r = 0.728). Touchdown distance was the only measure strongly related to both RF and performance (r = -0.710 with NAHEP). These findings suggest coaches should focus on strategies which manipulate lower-leg configurations at touchdown and actions during early stance if they wish to improve RF ability.</abstract><type>Thesis</type><journal/><volume/><journalNumber/><paginationStart/><paginationEnd/><publisher/><placeOfPublication>Swansea</placeOfPublication><isbnPrint/><isbnElectronic/><issnPrint/><issnElectronic/><keywords>biomechanics, sprint, kinematics, kinetics</keywords><publishedDay>23</publishedDay><publishedMonth>2</publishedMonth><publishedYear>2022</publishedYear><publishedDate>2022-02-23</publishedDate><doi/><url/><notes>A selection of third party content is redacted or is partially redacted from this thesis due to copyright restrictions.</notes><college>COLLEGE NANME</college><CollegeCode>COLLEGE CODE</CollegeCode><institution>Swansea University</institution><supervisor>Bezodis, Neil ; Burnie, Louise</supervisor><degreelevel>Master of Research</degreelevel><degreename>MSc by Research</degreename><apcterm/><funders/><projectreference/><lastEdited>2023-01-19T16:20:59.3005951</lastEdited><Created>2022-02-23T11:54:33.0809251</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Engineering and Applied Sciences - Uncategorised</level></path><authors><author><firstname>DANIEL</firstname><surname>KING</surname><order>1</order></author></authors><documents><document><filename>59441__22434__d20a929effe84e5fa200c74896d5d76f.pdf</filename><originalFilename>King_Daniel_T_MSc_Research_Thesis_Final_Redacted.pdf</originalFilename><uploaded>2022-02-23T12:24:45.0266037</uploaded><type>Output</type><contentLength>4554473</contentLength><contentType>application/pdf</contentType><version>Redacted version - open access</version><cronfaStatus>true</cronfaStatus><documentNotes>Copyright: The author, Daniel Thomas King, 2022.</documentNotes><copyrightCorrect>true</copyrightCorrect><language>eng</language></document></documents><OutputDurs/></rfc1807>
spelling 2022-02-23T12:24:45.0266037 v2 59441 2022-02-23 Relationships between kinematic characteristics and ratio of forces during initial sprint acceleration f3d1fb722569777f58b3fe8b76b6d921 DANIEL KING DANIEL KING true false 2022-02-23 In track sprinting, the athlete generates around 70% of their maximum velocity during the initial acceleration phase (Nagahara et al., 2019a). Effective acceleration performance is largely determined by the technical ability of effectively orientating force applied to the track, quantified by the ratio of forces (RF; Morin et al., 2011). This thesis aimed to investigate the relationships between kinematic characteristics and RF during the initial acceleration phase of sprinting, as these important considerations remain unknown. Fourteen male sprinters completed two maximal 60 m sprint efforts from a block start. Whole-body kinematic data and external kinetic data were measured for the first four steps on the track. An initial analysis using semi-partial correlations (sr) determined that step-to-step variation in RF over the four steps was not related (sr = -0.280) to initial acceleration performance (normalised average horizontal external power; NAHEP), but that mean RF (RFMEAN) over these steps was strongly related to initial acceleration performance (sr = 0.683). To address the aim of this thesis, correlations with kinematic characteristics, using RFMEAN as the dependent variable, revealed that placing the stance foot further behind the whole-body centre of mass at touchdown was strongly related to high RF (r = -0.672). Specific stance leg configurations contributed to this favourable touchdown distance - a more anterior orientation (i.e., of the proximal end) of the foot and shank segments were both very strongly associated with RF (r = -0.724 and r = -0.764, respectively). Following touchdown, ankle dorsiflexion range of motion was also very strongly related to RF (r = 0.728). Touchdown distance was the only measure strongly related to both RF and performance (r = -0.710 with NAHEP). These findings suggest coaches should focus on strategies which manipulate lower-leg configurations at touchdown and actions during early stance if they wish to improve RF ability. Thesis Swansea biomechanics, sprint, kinematics, kinetics 23 2 2022 2022-02-23 A selection of third party content is redacted or is partially redacted from this thesis due to copyright restrictions. COLLEGE NANME COLLEGE CODE Swansea University Bezodis, Neil ; Burnie, Louise Master of Research MSc by Research 2023-01-19T16:20:59.3005951 2022-02-23T11:54:33.0809251 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised DANIEL KING 1 59441__22434__d20a929effe84e5fa200c74896d5d76f.pdf King_Daniel_T_MSc_Research_Thesis_Final_Redacted.pdf 2022-02-23T12:24:45.0266037 Output 4554473 application/pdf Redacted version - open access true Copyright: The author, Daniel Thomas King, 2022. true eng
title Relationships between kinematic characteristics and ratio of forces during initial sprint acceleration
spellingShingle Relationships between kinematic characteristics and ratio of forces during initial sprint acceleration
DANIEL KING
title_short Relationships between kinematic characteristics and ratio of forces during initial sprint acceleration
title_full Relationships between kinematic characteristics and ratio of forces during initial sprint acceleration
title_fullStr Relationships between kinematic characteristics and ratio of forces during initial sprint acceleration
title_full_unstemmed Relationships between kinematic characteristics and ratio of forces during initial sprint acceleration
title_sort Relationships between kinematic characteristics and ratio of forces during initial sprint acceleration
author_id_str_mv f3d1fb722569777f58b3fe8b76b6d921
author_id_fullname_str_mv f3d1fb722569777f58b3fe8b76b6d921_***_DANIEL KING
author DANIEL KING
author2 DANIEL KING
format Staff Thesis
publishDate 2022
institution Swansea University
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 In track sprinting, the athlete generates around 70% of their maximum velocity during the initial acceleration phase (Nagahara et al., 2019a). Effective acceleration performance is largely determined by the technical ability of effectively orientating force applied to the track, quantified by the ratio of forces (RF; Morin et al., 2011). This thesis aimed to investigate the relationships between kinematic characteristics and RF during the initial acceleration phase of sprinting, as these important considerations remain unknown. Fourteen male sprinters completed two maximal 60 m sprint efforts from a block start. Whole-body kinematic data and external kinetic data were measured for the first four steps on the track. An initial analysis using semi-partial correlations (sr) determined that step-to-step variation in RF over the four steps was not related (sr = -0.280) to initial acceleration performance (normalised average horizontal external power; NAHEP), but that mean RF (RFMEAN) over these steps was strongly related to initial acceleration performance (sr = 0.683). To address the aim of this thesis, correlations with kinematic characteristics, using RFMEAN as the dependent variable, revealed that placing the stance foot further behind the whole-body centre of mass at touchdown was strongly related to high RF (r = -0.672). Specific stance leg configurations contributed to this favourable touchdown distance - a more anterior orientation (i.e., of the proximal end) of the foot and shank segments were both very strongly associated with RF (r = -0.724 and r = -0.764, respectively). Following touchdown, ankle dorsiflexion range of motion was also very strongly related to RF (r = 0.728). Touchdown distance was the only measure strongly related to both RF and performance (r = -0.710 with NAHEP). These findings suggest coaches should focus on strategies which manipulate lower-leg configurations at touchdown and actions during early stance if they wish to improve RF ability.
published_date 2022-02-23T04:16:45Z
_version_ 1763754120752136192
score 11.037581

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