Leather and Footwear Journal

Volume 18, no 1

Contents
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Experimental study on the effects of basketball on plantar pressure distribution of juveniles
- Pages 5-12
  Lei HU*
  - Chongqing Technology and Business University, Institute of Physical Education, Chongqing 400067, China, email: 289592324@qq.com
  ABSTRACT. With professional basketball games sweeping around the world, basketball is becoming more and more popular among juveniles. Therefore, it is of great significance to study the biomechanical effects of basketball on foot pressure and evaluate the impacts of basketball on the foot health development of juveniles in a scientific and objective manner. In this paper, by setting up an experimental group and a control group and using the RS-footscan force-measuring system, we attempt to test and analyze the planta support period, peak plantar pressure intensity, plantar impulse and foot axis angle of juveniles. The experimental results show that long-term basketball sports has a positive effect on the foot health development of juveniles. This study is very helpful to promoting basketball sports and preventing basketball injuries.
  
  KEY WORDS: basketball, experimental verification, experimental group, control group, plantar pressure
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Assessment of influential factors for purchasing gent's shoes - understanding the basic comfort properties
- Pages 13-24
  Amal Kanti DEB*, Md. Aftab Ali SHAIKH, Md. Rayhan SARKER, Md. Israil HOSSAIN
  - Institute of Leather Engineering and Technology, University of Dhaka, Dhaka-1209, Bangladesh, email: debak.707@gmail.com, aftabshaikh@du.ac.bd, md.sarkerdu.rayhan@gmail.com, israil.rafi@yahoo.com
  ABSTRACT. There are many factors that have a great influence over customer's decision in case of choosing gent's shoes and also several features are related to comfort properties of shoes. The aim of the study was to identify the most influential purchase factors of gent's shoes along with disclosing frequently considered comfort factors through target sample population and experts. Two questionnaire experiments were performed among selected respondents and four experts' opinions were observed. The number of total interviewees who provided their preference of choosing factors during shoe purchase was 72 and the interviewees gave their feedbacks especially on basic comfort properties after wearing three pairs of sample shoes for a period of two months. Bar chart, pie chart, Pareto analysis and average weighted method were followed for assessing data. Style, comfort, price and colour were the top four factors that were suggested by the respondents respectively and style, comfort, color and price were considered by the experts at the time of purchasing new shoes, respectively. On the other hand, breathability, proper size and fit, light weight, flexibility and appearance were selected as the most considered factors regarding shoe comfort, whereas experts suggested size and fit, cushioning, flexibility, light weight, breathability, arch support and toe profile shape, respectively. Those who wore sample shoes made of synthetic upper materials and narrow fitted in the forefoot region during the experimental period, tended to perceive them as very uncomfortable.
  
  KEY WORDS: comfort, preference, shoe, style
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Statistical-mathematical processing of anthropometric foot parameters and establishing simple and multiple correlations. Part 2: correlations among anthropometric parameters of the foot
- Pages 25-32
  Mirela PANTAZI^1*, Ana Maria VASILESCU¹, Aura MIHAI², Dana GURĂU¹
  - ¹INCDTP - Division: Leather and Footwear Research Institute, 93 Ion Minulescu, 031215 Bucharest, Romania, pantazimirela@yahoo.com
  - ²Gheorghe Asachi Technical University of Iasi, 67 Dimitrie Mangeron Blvd., Iasi, Romania, amihai@tex.tuiasi.ro
  ABSTRACT. Footwear manufacturing based on suitable lasts and appropriate sizes is possible, using the results obtained from anthropometric measurements. The construction of the last, the establishment of dimensions required to meet the comfort requirements of a larger proportion of consumers, must be based on the knowledge and the most accurate characterization of the anatomical-morphological differences of the types of foot encountered within that population of consumers as well as the frequency of these types within the population. For this purpose, it is periodically necessary to perform anthropometric studies on the population differentiated according to certain criteria (gender, age, geographical region, etc.) in order to obtain information about the dimensional particularities of the average representative foot for that population, the anthropometric parameters distribution laws that characterize the representative average foot of the country's population in terms of size. In order to define the characteristic dimensions of the foot, one- and two-dimensional distributions of anthropometric parameters were used as well as a series of correlations that model the interdependence among the various parameters, with direct applicability in designing the last. Linear regression equations can be used in last design to determine the dependences between the geometric parameters of the last in close connection with the laws of variation of the anthropometric parameters of the foot. Multiple linear correlations have been established demonstrating that there are very high correlations between certain variables.
  
  KEY WORDS: anthropometric parameters, foot, correlation
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Study on the effect of rubber sole on pressure change of foot movement
- Pages 33-38
  Hao LIN¹*, Zhiying JIANG²
  - ¹Department of Sports, Sanjiang University, Nanjing, Jiangsu, 211101, China
  - ²Department of Physical Education, Nanjing Communications Institute of Technology, Nanjing, Jiangsu, 210012, China
  ABSTRACT. With the progress of the times, more and more people are participating in sports to keep fit, which increased the demand and requirement on sport shoes, especially on their protection performance and shock absorption performance. The material and distribution of the rubber sole of sneakers often determine their quality and performance. This paper aims to analyze the performance of rubber sole and the pressure change of foot movement so as to provide reference for the design of sports shoes with excellent shock absorbing performance.
  
  KEY WORDS: rubber sole, foot movement, pressure, change
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Practical aspects of implementation of quality management system requirements for the medical footwear design
- Pages 39-44
  Daniel PETCU*, Viorica ROSCULET
  - INCDTP - Division: Leather and Footwear Research Institute, 93 Ion Minulescu St., Bucharest, Romania, email: crispinian.ro@gmail.com
  ABSTRACT. A quality management system in place and functioning can be certified by a neutral body, third party, that certifies compliance of the design process of the medical footwear to the reference specifications in this field. In states where pedorthics is developed, professional associations provide an accreditation of facilities that are operating in the design and production of pedorthic devices. Another option for conformity certification in the field of medical devices consists in demonstrating that quality management system (QMS) of the organization complies with the requirements of the standard reference in the field, respectively SR EN ISO 13485: 2016 "Medical devices. Quality management systems. Requirements for regulatory purposes". Design work carried out according to the requirements of this standard contributes to the development of medical devices complying with the regulations in this field for the benefit of the patient. This paper aims to present practical aspects of implementing the quality management system requirements for the design of medical footwear, applicable to small and medium companies.
  
  KEY WORDS: medical footwear design, conformity assessment, certification, quality management system
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Comparison of shock absorption performance of basketball shoe with different sole structures
- Pages 45-52
  Long LIU*
  - Zhengzhou Professional Technical Institute of Electronic & Information, Henan 450000, China, email: longl1976@sohu.com
  ABSTRACT. Basketball is a sport with high popularity, and it requires high on shoes. In violent experience, feet may be heavily impacted, which may cause damages to joints and nerves. Therefore, feet need the protection and shock absorption of basketball shoes. Today material science develops rapidly; the shock absorption system of basketball shoes is usually borne by the shock absorption property of shoe sole material. In recent years, the special design of basketball shoe sole structure has been a new approach to reduce shock. This study investigated the changes of impulse and pressure of sports shoes with different sole structures during sports through experiments, with the intention of providing a reference for the design and improvement of shock absorption sole of basketball shoes.
  
  KEY WORDS: basketball shoes, sole structure, shock absorption, plantar pressure
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Validation of method for determining the isoelectric point of protein solutions
- Pages 53-66
  Gabriela MACOVESCU, Ciprian CHELARU, Madalina IGNAT, Luminita ALBU, Dana GURAU
  - INCDTP - Division: Leather and Footwear Research Institute, 93 Ion Minulescu St, Bucharest, 3, 031215, Romania, elamac22@yahoo.com
  ABSTRACT. This paper presents the validation of a method for determining the isoelectric point of collagen hydrolysates used to obtain biomaterials for medical use produced in the Collagen Department of INCDTP - Division ICPI. The advantage of the presented method is that it is easy to apply, as the Zeta potential is the key parameter controlling electrostatic interactions in particle dispersions. The technique used to measure particle movement velocity in the Malvern Zetasizer Nano instrument series is Laser Doppler Velocimetry (LDV). It is an accepted method for measuring electrophoretic mobility of particles in the solution and by calculating the Zeta potential of protein solutions through extrapolation, the isoelectric point of the protein solution is determined.
  
  KEY WORDS: biomaterials, collagen, isoelectric point, method validation
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