A comparative analysis of the comfort of leather and substitute materials, especially for footwear / Wilfried Diebschlag in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIII (Année 1978)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXIII (Année 1978) . - p. 307-332 Titre : A comparative analysis of the comfort of leather and substitute materials, especially for footwear Type de document : texte imprimé Auteurs : Wilfried Diebschlag, Auteur Année de publication : 1978 Article en page(s) : p. 307-332 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chaussures -- Matériaux Confort Cuir Etudes comparatives Modèles mathématiques Pied Thermocinétique Transpiration Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : To develop the most satisfactory concept on which ta base the requirements for materials to he used for garments or footwear, the following data about man (which can vary among the different races) must be known : 1. Heat emission of different areas of the skin and heat distribution in the body, and 2. Water vapor and sweat emission from different areas of the skin. Both these factors must he considered under various conditions of stress and strain (physical or mental exercise, expressed in watts or joules per hour) ; under different climatic conditions (temperature, humidity, air movement) ; and with a variety of types of clothing. For 14 combinations of these factors, the basic data were established in tests over several years with subjects wearing different clothing under various conditions. At the same time, the physical properties of the materials worn were measured by test instruments, in particular such properties as their behavior towards water, water vapor, and heat, and their drying time. Note de contenu : - 1. INTRODUCTION : Wilson, the man who paved the way - The range of application of leather - 2. THE THERMOPHYSIOLOGICAL SURVEY OF MAN : THE BASIS FOR IMPROVED FOOTWEAR : Foot-sock-shoe as a microclimate functional system - Distribution of sweat glands and rate of sweat secretion - The influence of footwear on the microclimate in the shoe - Recommendations of the physiologist for shoe manufacturers - 3. THERMODYNAMIC PROGRAM FOR CALCULATION OF HEAT TRANSFER : Mechanisms of heat transfer from the body to the environment - Dry heat transfer - Evaporative heat transfer - Calculation for steady state - Examples of calculation fo r the functional system foot-shoe - Table 1 : Skin temperatures and heat and vapor flow under different conditions of activity, dress, and climate - Table 2 : Perspiration of man's body and foot compared to the water vapor characteristics of footwear materials - Table 3 : Constants for the calculation of variables Bi and Ti for various areas of the body - Table 4 : Physical characteristics of footwear - Table 5 : Physiological data of the foot when sitting or walking En ligne : https://drive.google.com/file/d/1MtcWd6Uqy4_IIWFlBxRmxcQWkyETU-UV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41154 [article]

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Differences in loading patterns between fast walking and jogging at the same speed in male adults / Ruoyi Li in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) . - 7. p. Titre : Differences in loading patterns between fast walking and jogging at the same speed in male adults Type de document : texte imprimé Auteurs : Ruoyi Li, Auteur ; Hao Liu, Auteur ; Mengyuan Guo, Auteur ; Jitka Badurova, Auteur ; Luming Yang, Auteur ; Haojun Fan, Auteur Année de publication : 2020 Article en page(s) : 7. p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomécanique Course à pied Hommes Marche Pied Statistique Transfert de charge Index. décimale : 796.51 Marche Résumé : Fast walking and jogging are two common exercises for people to maintain health in daily life. But the differences in loading patterns of fast walking and jogging are still unclear. The purpose of this study was to compare loading patterns in fast walking and jogging at the same speed, and to identify how differences in foot mechanics influence plantar pressure distribution between the two modes of gait. Totally, 49 healthy males participated in this study. Data of pressure parameters, including maximum force (MF), peak pressure (PP), contact area (CA), force-time integral (FTI), were recorded by Pedar-X insole plantar pressure measurement system in participants’ fast walking and jogging process at 7 km/h. A Load transfer analysis method was used to quantify the plantar load transference from fast walking to jogging. The results showed that MF, PP and CA increased in metatarsal regions and midfoot regions while decreased in toes regions and heel during jogging when compared with fast walking. FTI decreased in all foot regions during jogging compared to fast walking. Under the effects of spring mechanics and the varus of rearfoot during jogging, fast walking and jogging reveal different loading patterns. Compared jogging to fast walking, load transferred as follow : 1) in transverse direction, load transferred from lateral foot to medial foot in metatarsal regions and midfoot regions, 2) in longitudinal direction, load transferred from toes to the metatarsal, and from heel to the metatarsal and midfoot. These results also provide suggestions for footwear designs. Note de contenu : - Participants - Speed selects - Procedure - Statistical analysis - Load transfer analysis method - Table 1 Relative FTI (%) in fast walking and jogging at 7 km/h DOI : https://doi.org/10.1186/s42825-020-00021-4 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00021-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37335 [article]

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The center of pressure progression characterizes the dynamic function of high-arched feet during walking / Bo Li in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) . - 10 p. Titre : The center of pressure progression characterizes the dynamic function of high-arched feet during walking Type de document : texte imprimé Auteurs : Bo Li, Auteur ; Qipeng Xiang, Auteur ; Xianyi Zhang, Auteur Année de publication : 2020 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des données Marche Pied Tags : 'Haute-arche'  'Marche'  'Centre  de  pression'  Rapidité Index. décimale : 613.71 Exercice et activités sportives Résumé : - Background : The medial longitudinal arch height has an effect on kinetic parameters during gait and might be related to the risk of injury. For the assessment of foot structures, the center of pressure (COP) trajectory is a more reliable and practical parameter than plantar pressure. This study aimed to clarify the COP trajectory and velocity characteristics in the medial-lateral and anterior-posterior direction of individuals with a high-arched foot during barefoot walking. - Methods : Sixty-two healthy young adults were asked to walk over a Footscan pressure plate to record the COP parameters during the stance phase of walking. - Results : Compared to normal arched feet, the COP during forefoot contact and foot flat phases of high-arched feet shifted anteriorly (19.9 mm and 15.1 mm, respectively), and the mean velocity of COP in anterior-posterior direction decreased by 0.26 m/s and increased by 0.044 m/s during these two phases respectively. - Conclusions : The findings of this study suggest that the displacement and velocity of COP in anterior-posterior direction was different between high-arched and normal-arched subjects during barefoot walking, which can be used for the assessment of gait characteristics for high-arched individuals. The results of this study may provide insights into modifying clinical intervention for individuals with high-arched feet to enhance rehabilitation and prevent injuries and have implications for assessing the design of footwear and foot orthotics. Note de contenu : - Participants - Materials and apparatus - Procedures - Data analysis - Table 1 : Statistics of subjects - Table 2 : Comparison of ML-COP deviation and velocity between high-arched and normal feet - Table 3 : Comparison of AP-COP deviation and velocity between high-archedes and normal feet DOI : 10.1186/s42825-019-0016-6 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-019-0016-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37137 [article]

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