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Biomechanics of World-Class 800 m Women at the 2017 IAAF World Championships

The 800 m race challenges the aerobic and anaerobic energy systems, and athletes adopt a technique that allows for running efficiency as well as sprinting speeds. The aim of this novel study was to compare important kinematic variables between the two laps of the 2017 IAAF World Championships women&...

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Autores principales: Hanley, Brian, Merlino, Stéphane, Bissas, Athanassios
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9047885/
https://www.ncbi.nlm.nih.gov/pubmed/35498532
http://dx.doi.org/10.3389/fspor.2022.834813
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author Hanley, Brian
Merlino, Stéphane
Bissas, Athanassios
author_facet Hanley, Brian
Merlino, Stéphane
Bissas, Athanassios
author_sort Hanley, Brian
collection PubMed
description The 800 m race challenges the aerobic and anaerobic energy systems, and athletes adopt a technique that allows for running efficiency as well as sprinting speeds. The aim of this novel study was to compare important kinematic variables between the two laps of the 2017 IAAF World Championships women's final. Video data (150 Hz) were collected of all eight finalists on both laps at a distance approximately 50 m from the finish line along the home straight. Running speed, step length, cadence, temporal variables, sagittal plane joint angles, and shank angle at initial contact were measured. Running speed was faster on lap 2 (p = 0.008) because of large increases in cadence (p = 0.012). These higher cadences resulted in large decreases in contact times (p = 0.031) and in flight times (p = 0.016) on lap 2. Greater knee flexion and ankle plantarflexion (p ≤ 0.039) at initial contact on lap 2 seemed partly responsible for shorter swing times (p = 0.016), and which accompanied a decrease in shank angle at initial contact from lap 1 (7°) to a more vertical position on lap 2 (4°) (p = 0.008). Coaches should note that the need for higher cadence, horizontal impulse production during shorter contact times, and the adoption of forefoot striking require strength and neural system training to allow for athletes to increase cadence during the sprint finish. Increasing cadence (and not step length) was the driving factor for faster finishing speeds in the women's 800 m.
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spelling pubmed-90478852022-04-29 Biomechanics of World-Class 800 m Women at the 2017 IAAF World Championships Hanley, Brian Merlino, Stéphane Bissas, Athanassios Front Sports Act Living Sports and Active Living The 800 m race challenges the aerobic and anaerobic energy systems, and athletes adopt a technique that allows for running efficiency as well as sprinting speeds. The aim of this novel study was to compare important kinematic variables between the two laps of the 2017 IAAF World Championships women's final. Video data (150 Hz) were collected of all eight finalists on both laps at a distance approximately 50 m from the finish line along the home straight. Running speed, step length, cadence, temporal variables, sagittal plane joint angles, and shank angle at initial contact were measured. Running speed was faster on lap 2 (p = 0.008) because of large increases in cadence (p = 0.012). These higher cadences resulted in large decreases in contact times (p = 0.031) and in flight times (p = 0.016) on lap 2. Greater knee flexion and ankle plantarflexion (p ≤ 0.039) at initial contact on lap 2 seemed partly responsible for shorter swing times (p = 0.016), and which accompanied a decrease in shank angle at initial contact from lap 1 (7°) to a more vertical position on lap 2 (4°) (p = 0.008). Coaches should note that the need for higher cadence, horizontal impulse production during shorter contact times, and the adoption of forefoot striking require strength and neural system training to allow for athletes to increase cadence during the sprint finish. Increasing cadence (and not step length) was the driving factor for faster finishing speeds in the women's 800 m. Frontiers Media S.A. 2022-04-14 /pmc/articles/PMC9047885/ /pubmed/35498532 http://dx.doi.org/10.3389/fspor.2022.834813 Text en Copyright © 2022 Hanley, Merlino and Bissas. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Sports and Active Living
Hanley, Brian
Merlino, Stéphane
Bissas, Athanassios
Biomechanics of World-Class 800 m Women at the 2017 IAAF World Championships
title Biomechanics of World-Class 800 m Women at the 2017 IAAF World Championships
title_full Biomechanics of World-Class 800 m Women at the 2017 IAAF World Championships
title_fullStr Biomechanics of World-Class 800 m Women at the 2017 IAAF World Championships
title_full_unstemmed Biomechanics of World-Class 800 m Women at the 2017 IAAF World Championships
title_short Biomechanics of World-Class 800 m Women at the 2017 IAAF World Championships
title_sort biomechanics of world-class 800 m women at the 2017 iaaf world championships
topic Sports and Active Living
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9047885/
https://www.ncbi.nlm.nih.gov/pubmed/35498532
http://dx.doi.org/10.3389/fspor.2022.834813
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