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Changes in Running Mechanics and Spring-Mass Behaviour during a 5-Km Time Trial

Abstract : Research into the biomechanical manifestation of fatigue during exhaustive runs is increasingly popular but additional understanding of the adaptation of the spring-mass behaviour during the course of strenuous, self-paced exercises continues to be a challenge in order to develop optimized training and injury prevention programs. This study investigated continuous changes in running mechanics and spring-mass behaviour during a 5-km run. 12 competitive triathletes performed a 5-km running time trial (mean performance: 17 min 30 s) on a 200 m indoor track. Vertical and anterior-posterior ground reaction forces were measured every 200 m by a 5-m long force platform system, and used to determine spring-mass model characteristics. After a fast start, running velocity progressively decreased (− 11.6%; P0.05), decreased with time. As a result, vertical stiffness decreased (− 6.0%; P0.05). Spring-mass behaviour progressively changes during a 5-km time trial towards deteriorated vertical stiffness, which alters impact and force production characteristics.
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Submitted on : Tuesday, February 14, 2017 - 4:18:51 PM
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Olivier Girard, Grégoire P. Millet, Jean Slawinski, Sébastien Racinais, Jean-Paul Micallef. Changes in Running Mechanics and Spring-Mass Behaviour during a 5-Km Time Trial. International Journal of Sports Medicine, Thieme Publishing, 2013, 34 (09), pp.832-840. ⟨10.1055/s-0032-1329958⟩. ⟨hal-01467716⟩



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