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Asian J Kinesiol > Volume 18(2); 2016 > Article
The Official Journal of the Korean Academy of Kinesiology 2016;18(2):43-52.
DOI: https://doi.org/10.15758/jkak.2016.18.2.43    Published online May 31, 2016.
Analysis of Shoe Evaluation Variables with Increments of Running Velocity.
Chang-Soo Kwak, Min-Ju Jeon
Hallym University
Hallym Polytechnic University
Correspondence:  Min-Ju Jeon,
Email: cskwak@hallym.ac.kr
Received: 25 April 2016   • Accepted: 20 May 2016
Abstract
PURPOSE
The purpose of this study was to analyze rearfoot control and impact force absorption variables with increments of running velocity, and provide essential data to enhance evaluation of sports shoes.
METHODS
Subjects in this study were ten healthy college students with normal foot function and without lower extremity injuries in the past year. Experimental shoes were shoes with a 50 of midsole hardness and 0.74 N/mm of bending stiffness. Motions of lower extremity at 3 different running velocities were analyzed through 3D cinematography and force platform.
RESULTS
Initial Achilles tendon angle, Initial 1/10 Achilles tendon angle, Maximal Achilles tendon angle were found to be larger than those reported in previous studies, but initial pronation was smaller while total pronation, compressive angle, torsion angle were similar. Most of the rearfoot angle and impact force absorption variables increased with increments of running velocity in comparisons with the previous studies.
CONCLUSIONS
These results indicate that some of the variables were extremely sensitive to running velocity while some were sensitive in a smaller range, and the other were not influenced by different running velocities. So, it is very important to control the running velocity if results should be compared for different shoes. The present study suggest that proper running velocity for shoe evaluation should be within 4㎧.
Keywords: rearfoot control, impact force, impact absorption, ground reaction force, pressure distribution
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