Volume 7 Supplement 1

4th Congress of the International Foot and Ankle Biomechanics Community

Open Access

Plantar pressure distribution during treadmill walking in comfort shoes with PLA(Poly Lactic Acid) resins

  • Seung-Bum Park1Email author,
  • Kyung-Deuk Lee1,
  • Dae-Woong Kim1,
  • Jung-Hyeon Yoo1 and
  • Kyung-Hun Kim1
Journal of Foot and Ankle Research20147(Suppl 1):A123

https://doi.org/10.1186/1757-1146-7-S1-A123

Published: 8 April 2014

In the framework of environmentally friendly processes and products, poly lactic acid(PLA) represents the best polymeric substitutes for various petropolymers because of its renewability, biodegradability, biocompatibility and good thermomechanical properties [1]. The purpose of this study was to analyze foot pressure distribution of PLA materials in functional shoes. Comfort is an important aspect in footwear. Footwear comfort has an influence on injury [2, 3]. The development of new materials is considered as the important point for manufacturing functional shoes [4].

Ten healthy female(mean height: 159.8 cm, mean body mass: 54.8 kg, mean age 20.8 yrs.) participated in this study. All subjects were free of lower extremity pain, history of serious injuries or operative treatment, or subjective symptoms interfering with walking.

The subjects were required to walking(3.2km/h) for treadmill. Each subject wore two different shoes, type A(PLA) and Type B(control)(figure 1) during walking. The PEDAR®-X insole system(Novel GmbH, Germany) was used to measure the foot pressure and force. Pressure distribution data(contact areas, maximum force, peak pressure, maximum mean pressure) was collected with pressure device at a sampling rate of 100Hz. The feet were divided into four regions: foot(Total), forefoot, midfoot, rearfoot.
Figure 1

The two different shoes conditions: Type A(PLA), Type B(Control), Size 245mm

Results of foot pressure distribution date show that(figure 2) contact area increased by 4% in the type A compared to type B, Also, maximum mean pressure decreased by 5%. However, peak force increased by 6%, and peak pressure increased by 5% as well. AS a result PLA resins may be helpful in decreasing overall pressure in foot therefore provide better comfort in foot.
Figure 2

Comparison of foot pressure.

Authors’ Affiliations

(1)
Footwear Biomechanics Team, Footwear Industrial Promotion Center

References

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Copyright

© Park et al; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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