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Leg stiffness and stride frequency in human running

C T Farley¹, O González

¹Museum of Comparative Zoology, Harvard University, Bedford, MA 01730, USA.

Journal of Biomechanics

|February 1, 1996

Summary

Running involves a leg spring system. To increase stride frequency at a given speed, humans make the leg spring stiffer, which is the primary adjustment. This enhances running mechanics.

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Area of Science:

Biomechanics
Human Locomotion

Background:

Mammalian running utilizes a simple spring-mass model with a linear leg spring.
This model effectively describes running mechanics across various speeds.
Previous research indicated leg spring stiffness is constant, with adjustments made via leg angle at higher speeds.

Purpose of the Study:

To investigate the role of leg spring stiffness versus leg angle in altering stride frequency at a constant running speed.
To determine the primary mechanical adjustment for changes in stride frequency during human running.

Main Methods:

Human subjects ran on force plates at a constant speed (2.5 m/s).
Stride frequencies were varied significantly above and below the preferred rate.
Force platform data analyzed leg spring stiffness and the angle swept by the leg.

Main Results:

Leg spring stiffness increased significantly (2.3-fold) with higher stride frequencies.
The angle swept by the leg spring decreased as stride frequency increased.
These changes partially counteracted each other in the spring-mass system.

Conclusions:

Increased leg spring stiffness is the dominant adaptation for higher stride frequencies during running.
The body primarily stiffens its leg spring system to accommodate faster strides.
This finding refines the understanding of the spring-mass model in human locomotion.

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