Individual Effects of Stride Length and Frequency on Shock Attenuation during Running

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Abstract

Purpose

To identify the independent affects of stride length (SL) and stride frequency (SF) on shock attenuation.

Methods:

Subjects (N = 10) completed three experiments consisting of SL and SF manipulations relative to preferred stride length (PSL) and frequency (PSF). During experiment 1, stride length was manipulated (+15% PSL, PSL, −15% PSL) while stride frequency was always set to PSF. During experiment 2, stride frequency was manipulated (+15% PSF, PSF, −15% PSF) while stride length was always set to PSL. During experiment 3, stride length and stride frequency were manipulated concurrently (+10% PSL/−10% PSF, PSL/PSF, and −10% PSL/+10% PSF). Running velocity was always the product of stride length and stride frequency. Transfer functions were calculated using tibial and forehead surface mounted accelerometer data to represent shock attenuation.

Results

Shock attenuation changed only when stride length changed (P < 0.05). Specifically, shock attenuation increased as stride length increased.

Conclusion

It was concluded that changes in stride length not stride frequency affected shock attenuation.

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