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Spring-mass model characteristics during sprint running: correlation with performance and fatigue-induced changes.
J-B Morin1, T Jeannin, B Chevallier
1Laboratoire de Physiologie-PPEH, Universite de Saint-Etienne, France. Jean.Benoit.Morin@univ-st-etienne.fr
International Journal of Sports Medicine
|February 14, 2006
Summary
Running performance declines with fatigue as vertical stiffness and step frequency decrease. Leg stiffness remains constant, indicating specific adaptations in the spring-mass model during repeated sprints.
Area of Science:
- Biomechanics
- Exercise Physiology
Background:
- The spring-mass model is crucial for understanding running mechanics.
- Investigating how mechanical properties change during fatiguing sprints is important for performance analysis.
Purpose of the Study:
- To analyze changes in spring-mass model parameters during repeated 100-m sprints.
- To correlate these mechanical changes with sprint performance decrements.
Main Methods:
- Eight non-specialized male runners performed four 100-m sprints.
- A simple measurement method assessed leg stiffness, vertical stiffness, center of mass displacement, and stride characteristics.
- Mechanical parameters were correlated with sprint performance metrics.
Main Results:
- Leg and vertical stiffness remained constant during the first 100m sprint.
- Subsequent sprints showed significant decreases in vertical stiffness, step frequency, and contact time.
- These decreases correlated with reduced maximal and mean sprint velocities.
- Leg stiffness and maximal force remained unchanged.
Conclusions:
- Repeated sprints induce fatigue, leading to decreased vertical stiffness and step frequency.
- Impairment in lower limb spring-mass properties is directly related to performance decline under fatigue.
- Leg stiffness appears to be a more robust parameter during these fatiguing efforts.