Mechanical Alterations during 800-m Self-Paced Track Running.

Détails

ID Serval
serval:BIB_09C1F96D0D55
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Mechanical Alterations during 800-m Self-Paced Track Running.
Périodique
International journal of sports medicine
Auteur(s)
Girard O., Millet G.P., Micallef J.P.
ISSN
1439-3964 (Electronic)
ISSN-L
0172-4622
Statut éditorial
Publié
Date de publication
04/2017
Peer-reviewed
Oui
Volume
38
Numéro
4
Pages
314-321
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
We assessed the time course of running mechanical alterations during an 800-m. On a 200-m indoor track, 18 physical education students performed an 800-m self-paced run. Once per lap, ground reaction forces were measured by a 5-m-long force platform system, and used to determine running kinetics/kinematics and spring-mass characteristics. Compared with 100 m (19.4±1.8 km.h(-1)) running velocity progressively decreased at 300, 500 m but levelled-off at 700 m marks (-5.7±4.6, -10.4±8.3, and -9.1±13.5%, respectively; P<0.001). Stride length (-8.5±2.3%, P<0.01) and frequency (-1.0±1.5%, P=0.05) along with peak braking (-7.5±4.4%, P<0.05) and push-off forces (-5.1±7.2%, P<0.05) decreased from 100 m to 700 m. Peak vertical forces (-3.0±2.7%; P>0.05) and leg compression (+2.8±3.9%; P>0.05) remained unchanged, whereas centre of mass vertical displacement (+24.0±7.0%; P<0.001) increased during the run. Vertical stiffness decreased (-18.1±4.4%; P<0.001), whereas leg stiffness was unchanged (-3.2±4.6%; P>0.05). During an 800 m by physical education students, highest running velocity was achieved early during the run, with a progressive decrease in the second half of the trial. While vertical ground force characteristics remained unchanged, non-specialist runners produced lower peak braking and push-off forces, in turn leading to shorter stride length. Spring-mass model characteristics changed toward lower vertical stiffness values, whereas leg stiffness did not change.

Pubmed
Création de la notice
07/03/2017 19:22
Dernière modification de la notice
03/03/2018 13:32
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