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Comparative Analysis of Lower Limb Kinematics between the Initial and Terminal Phase of 5km Treadmill Running

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Published on: July 17, 2020

Changes in spring-mass model characteristics during repeated running sprints.

Olivier Girard¹, Jean-Paul Micallef, Grégoire P Millet

¹Research and Education Centre, ASPETAR, Qatar Orthopaedic and Sports Medicine Hospital, PO Box 29222, Doha, Qatar. oliv.girard@gmail.com

European Journal of Applied Physiology

|September 9, 2010

Summary

Fatigue significantly reduces vertical stiffness during repeated 40m sprints, impacting running performance. Maintaining higher vertical stiffness and stride frequency is key to improving repeated sprint ability.

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Area of Science:

Biomechanics
Sports Science
Exercise Physiology

Background:

Repeated sprint ability is crucial in many sports.
Understanding fatigue-induced changes in running mechanics is essential for performance optimization.
The spring-mass model provides a framework for analyzing running dynamics.

Purpose of the Study:

To investigate how fatigue affects spring-mass model characteristics during repeated 40m running sprints.
To identify changes in key biomechanical parameters like stiffness and stride characteristics.
To correlate changes in vertical stiffness with performance metrics.

Main Methods:

Sixteen active subjects performed 12 x 40m sprints with 30s recovery.
Vertical and anterior-posterior ground reaction forces were measured.
Spring-mass model parameters, including stiffness and stride characteristics, were calculated.

Main Results:

Contact, flight, and swing times increased with fatigue.
Stride frequency and push-off forces decreased, while vertical stiffness significantly declined.
Changes in vertical stiffness correlated strongly with changes in stride frequency.

Conclusions:

Repeated 40m sprints lead to decreased vertical stiffness and altered impact parameters due to fatigue.
Maintaining higher vertical stiffness and faster stride frequencies is crucial for improving repeated sprint performance.