Mechanical Alterations during 800-m Self-Paced Track Running
| Autor: | Grégoire P. Millet, Olivier Girard, Jean-Paul Micallef |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Male
Physical Therapy Sports Therapy and Rehabilitation Kinematics Athletic Performance Running Young Adult 03 medical and health sciences 0302 clinical medicine medicine Humans Orthopedics and Sports Medicine Force platform Vertical displacement Ground reaction force Muscle Skeletal Students Track and field athletics Self paced Mathematics Stiffness 030229 sport sciences Compression (physics) Biomechanical Phenomena medicine.symptom 030217 neurology & neurosurgery Biomedical engineering |
| Zdroj: | International Journal of Sports Medicine. 38:314-321 |
| ISSN: | 1439-3964 0172-4622 |
| Popis: | 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 0.05) and leg compression (+2.8±3.9%; P>0.05) remained unchanged, whereas centre of mass vertical displacement (+24.0±7.0%; P 0.05). 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. |
| Databáze: | OpenAIRE |
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