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Hao X.,The Quartermaster Equipment Institute of the General Logistics | Ma W.,Beijing Institute of Fashion Technology | Gan G.,Li Ning China Sports Goods Co. | Zhao P.,The Quartermaster Equipment Institute of the General Logistics | And 2 more authors.
Advanced Materials Research | Year: 2013

This paper introduces the study of structure on EVA (ethylene-vinyl acetate)/hemp stem powder compound system. The micro behavior of EVA/hemp system was measured by SEM (Scanning Electron Microscopy), and its thermal properties were measured by DSC (Differential Scanning Calorimetry). It indicates that hemp stem core has entered into EVA foaming system successfully when measured by FT-IR (Fourier Transform Infrared). © (2013) Trans Tech Publications, Switzerland.

Hao X.M.,Quartermaster Research Institute | Yang Y.,China Hemp Industrial Investing Holding Co. | Chen X.,Quartermaster Research Institute | Huang J.,Li Ning China Sports Goods Co. | Hao X.,Quartermaster Research Institute
Advanced Materials Research | Year: 2013

The sport shoe should have moisture absorbing & quick drying property, the quick-drying property of the shoes is affected by the shoe material such as upper, lining and insole. In this paper, three types shoes were prepared with hemp/polyester blended fabric, cotton and polyester. Their quick-drying properties of were studied using methods such as static simulation and animated simulations. The hemp/Polyester shoe possesses better moisture absorbent and quick drying property. © (2013) Trans Tech Publications, Switzerland.

Sterzing T.,Li Ning China Sports Goods Co. | Barnes S.,Li Ning China Sports Goods Co. | Barnes S.,Victoria University | Althoff K.,University of Duisburg - Essen | And 2 more authors.
Footwear Science | Year: 2014

Background: Tennis is played globally across genders, skill levels, and surfaces. However, there is a lack of knowledge of athletes' footwear requirements regarding wearing habits, importance of shoe properties, desired degree of shoe properties, shoe problems, and foot discomfort. Therefore, this survey aimed to analyse these aspects comprehensively in China, USA, and Germany.Methods: Our survey involved 1524 competitive tennis players who provided their perspective on tennis footwear by answering supervised hard copy questionnaires. Data was analysed by descriptive statistics for the total population and for subgroups of country, gender, and skill level.Results: Across countries the most important shoe properties were fit, comfort, traction, injury protection, and outsole durability. However, the desired degree of shoe properties between countries was slightly different for some features. Chinese ask for comparatively narrower fit, Americans and Germans require comparatively higher traction. Durability and foot sweating are the most common shoe problems among all players and the plantar ball area is predominantly prone to foot discomfort.Conclusion: Although differences between countries, genders and skill level were observed, footwear requirements are comparable across groups. Observations provide evidence-based guidance for tennis footwear design, manufacturing and respective research areas. © 2014 © 2014 Taylor & Francis.

Hong Y.,Chengdu University of Technology | Hong Y.,Chinese University of Hong Kong | Lam W.K.,Li Ning China Sports Goods Co. | Wang S.,Beifang University of Nationalities | Cheung J.T.-M.,Li Ning China Sports Goods Co.
Footwear Science | Year: 2016

This study examined whether the shoe usage time influences the comfort perception and direction change performance of badminton shoes. Fifteen university badminton players performed direction change trials with maximum-effort at new and extensively worn shoe conditions. Two professional badminton shoe models (Shoe Y and Shoe L) were selected to examine if both tested shoes would have similar usage time effect on comfort perception and direction change performance. Comfort perception of in-shoe climate, overall fit, medial-lateral stability, overall cushioning, shoe-ground traction, and overall comfort were measured using a 150 mm Visual Analogue Scales, immediately after the direction change trials. After finishing data collection of new shoe condition (day 1), the tested shoes were assigned to the university badminton team players to simulate the extensively worn condition that normally used during badminton training for eight weeks (i.e., 96 hours in total). The identical testing procedure was performed by the same experimenter for the extensively worn shoe condition (day 2). Paired t-tests were performed to investigate if there were any significant differences between new and extensively worn condition in each of the variables. Significance level was set at P < 0.05. No difference in direction change performance between new and extensively worn conditions was determined in each shoe (P > 0.05). Y shoe indicated significant poorer perception of medial-lateral stability, overall fit, and in-shoe climate (P < 0.05) while L shoe indicated significant poorer perception of overall fit and in-shoe climate for the extensively worn shoe condition, compared to the new shoe condition (P < 0.05). Prolonged shoe usage time plays a role in footwear comfort perception, but not in direction change performance. Changing with a new pairs of shoes would be considered to attain better comfort perception for badminton players during practice and competition. © 2016 Informa UK Limited, trading as Taylor & Francis Group.

Sterzing T.,Li Ning China Sports Goods Co. | Wulf M.,TU Munich | Qin T.Y.,Li Ning China Sports Goods Co. | Brauner T.,TU Munich
Footwear Science | Year: 2014

Purpose: Soccer shoes influence agility running due to traction properties. Shoe upper fit was identified to effect stability perception of players. However, its influence on agility running performance is unclear. This study examined whether soccer shoe ball girth dimension affects fit perception, agility running, and running speed perception. It was hypothesised that a narrower shoe ball girth would improve running performance.Methods: Thirty male soccer players performed agility runs in three experimental shoe conditions, featuring the same length but different ball girth (narrow, medium, wide). Fit perception, running time, and running speed perception were measured by a timing gate and perception protocols. One-way repeated measures analysis of variance (ANOVA) and Friedman tests were used to identify differences among shoe conditions, complemented by least significant difference (LSD) post-hoc and Wilcoxon signed rank tests.Results: Fit perception scores revealed that the medium and the wide shoe condition were perceived to have wider ball girth compared to the narrow condition (p < 0.05). No agility running performance and running speed perception differences were detected among shoe conditions. Anatomical foot measures were only weakly, or not correlated to fit perception at corresponding shoe locations.Conclusion: Fit differences of soccer shoes, only regarding their ball girth, did not influence agility running performance. This indicates a lesser importance of fit properties for achieving best running performance compared to traction properties, when ball girth is varied in shoes featuring a given shoe length. Individual lacing procedures were used in this study and may have compensated for the fit differences of the experimental shoes of this research. © 2014 © 2014 Taylor & Francis.

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