Individual effects of stride length and frequency on shock attenuation during running.

@article{Mercer2003IndividualEO,
  title={Individual effects of stride length and frequency on shock attenuation during running.},
  author={John Mercer and Paul Devita and Timothy R. Derrick and Barry T. Bates},
  journal={Medicine and science in sports and exercise},
  year={2003},
  volume={35 2},
  pages={
          307-13
        }
}
UNLABELLED Shock attenuation during running is the process of absorbing impact energy due to the foot-ground collision, reducing shock wave amplitude between the foot and head. Shock attenuation is affected by changes in stride length and stride frequency, but it is not clear whether either parameter individually affects shock attenuation. PURPOSE To identify the independent affects of stride length (SL) and stride frequency (SF) on shock attenuation. METHODS Subjects ( N = 10) completed… 

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References

SHOWING 1-10 OF 27 REFERENCES

Energy absorption of impacts during running at various stride lengths.

It was postulated that the increased perpendicular distance from the line of action of the resultant ground reaction force to the knee joint center played a role in this increased energy absorption.

Shock attenuation and stride frequency during running

Spectral analysis of impact shock during running

The Variability in Running Gait Caused by Force Plate Targeting

This study examined the influence of force plate targeting, via stride length adjustments, on the magnitude and consistency of ground reaction force and segment angle profiles of the stance phase of

Direct dynamics simulation of the impact phase in heel-toe running.

The effect of stride length variation on oxygen uptake during distance running.

The relatively efficient running patterns used by the subjects during unrestricted running indicate either an adaption to the chosen stride length through training or a successful process of energy optimization.

The shock attenuation role of the ankle during landing from a vertical jump.

Three landing surfaces were used to examine a hypothesized increased shock attenuation role of the ankle with increased damping demands, suggesting that the entrenched kinematics of landing surpassed the introduced range of surface cushioning.

Leg stiffness and stride frequency in human running.

Modeling the Stiffness Characteristics of the Human Body while Running with Various Stride Lengths

A modified mass-spring-damper model was used to simulate the vertical ground reaction forces of a human runner as stride length was altered. Spring stiffness values were selected by an optimizing