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J Sci Med Sport. 2014 Mar;17(2):218-22. doi: 10.1016/j.jsams.2013.03.015. Epub 2013 May 1.

The effects of preferred and non-preferred running strike patterns on tissue vibration properties.

Author information

1
Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada. Electronic address: henders@kin.ucalgary.ca.
2
Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada.

Abstract

OBJECTIVES:

To characterize soft tissue vibrations during running with a preferred and a non-preferred strike pattern in shoes and barefoot.

DESIGN:

Cross-sectional study.

METHODS:

Participants ran at 3.5 m s(-1) on a treadmill in shoes and barefoot using a rearfoot and a forefoot strike for each footwear condition. The preferred strike patterns for the subjects were a rearfoot strike and a forefoot strike for shod and barefoot running, respectively. Vibrations were recorded with an accelerometer overlying the belly of the medial gastrocnemius. Thirteen non-linearly scaled wavelets were used for the analysis. Damping was calculated as the overall decay of power in the acceleration signal post ground contact. A higher damping coefficient indicates higher damping capacities of the soft tissue.

RESULTS:

The shod rearfoot strike showed a 93% lower damping coefficient than the shod forefoot strike (p<0.001). A lower damping coefficient indicates less damping of the vibrations. The barefoot forefoot strike showed a trend toward a lower damping coefficient compared to a barefoot rearfoot strike. Running barefoot with a forefoot strike resulted in a significantly lower damping coefficient than a forefoot strike when wearing shoes (p<0.001). The shod rearfoot strike showed lower damping compared to a barefoot rearfoot strike (p<0.001). While rearfoot striking showed lower vibration frequencies in shod and barefoot running, it did not consistently result in lower damping coefficients.

CONCLUSIONS:

This study showed that the use of a preferred movement resulted in lower damping coefficients of running related soft tissue vibrations.

KEYWORDS:

Barefoot; Muscles; Running; Shoes; Strike pattern; Vibration

PMID:
23642961
DOI:
10.1016/j.jsams.2013.03.015
[Indexed for MEDLINE]

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