排序方式： 共有49条查询结果，搜索用时 203 毫秒
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Dimitrios Challoumas Georgios Dimitrakakis 《Sports biomechanics / International Society of Biomechanics in Sports》2017,16(3):325-341
Infraspinatus atrophy (IA) is much more prevalent in overhead sports compared with the general population. Its exact aetiology in this group of athletes remains unclear and definitive associations with pathology and performance have not yet been reached. The aim of this systematic review is to present the evidence on IA in overhead athletes focussing on the proposed mechanisms of suprascapular neuropathy and its associations with shoulder pathology and performance. A thorough literature search via Medline, EMBASE and Scopus was performed. From the nine articles identified, the majority of authors propose suprascapular nerve (SN) injury at the spinoglenoid notch; however, the suprascapular notch has also been suggested as a potential site of injury. With regard to the exact mechanism of suprascapular neuropathy, the majority of authors propose repeated traction of the nerve during extreme shoulder abduction and horizontal adduction and/or eccentric contractions of the infraspinatus. In the limited relevant literature, convincing links between IA and performance or shoulder pathology have not been identified. IA in overhead sports is most likely of multi-factorial aetiology. Important questions about IA and its significance in overhead sports remain unanswered and more biomechanical and prospective studies are warranted to provide further insights into this athletic injury. 相似文献
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Dimitrios Patsopoulos 《Science & Education》2005,14(7-8):747-761
The different and contrasting versions of the etymology of the term ‘electricity’ in Modern Greek textbooks of Physics of
the 18th and 19th century, which are influenced by French and German textbooks, are not mere (re)constructions that serve
the didactic purposes and objectives of their authors. They are (in)directly related to the social and cultural framework
within and through which Physics were taught at the time, and this is something to be considered seriously by active instructors
of Physics. 相似文献
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Dimitrios Kolokotronis Christina Solomonidou 《Education and Information Technologies》2003,8(3):229-244
We present the educational software Interactions between Objects, which we designed and developed to assist constructive teaching of Newton's 3rd law and Newtonian Dynamics in general. The software was designed on the basis of students' empirical ideas and conceptual difficulties, identified from previous research with Greek students (11–16 years old), the main findings of which are presented. We describe the step-by step design of this software, which aims to help students reconstruct their knowledge in the action–reaction thematic field through a number of experiments, by simulating real everyday life situations of interaction between bodies, modeling those situations by the help of an appropriate didactic method, applying cognitive conflict processes and supporting run my model features to promote students' conceptual change in this physics area. 相似文献
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Dimitrios Tsolis Spyros Sioutas Michalis Nik Xenos Georgios Styliaras 《Journal of Cultural Heritage》2011,12(4):466
As a general and effective protection measure for copyright violations, which occur with the use of digital technologies including peer-to-peer (P2P) networks, copyright owners from the cultural sector often use Digital Rights Management (DRM) systems and digital watermarking techniques so as to encrypt copyright information to the cultural content. In other cases, copyright owners restrict or even block access to the digital cultural content through the Internet and the P2P infrastructure. This chapter claims that DRM and P2P can be quite complementary. Specifically, a P2P infrastructure is presented which allows broad digital cultural content exchange while on the same time supports copyright protection and management through watermarking technologies for digital images. 相似文献
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Makras P Koukoulis GN Bourikas G Papatheodorou G Bedevis K Menounos P Pappas D Kartalis G 《Journal of sports sciences》2005,23(8):825-834
In this study, we assessed the effects of a 4 week basic military physical training programme for male recruits of the Hellenic Air Force on the number and distribution of circulating immune cells and adrenergic and adrenocortical hormonal responses. One group of recruits (exercised, n = 48) participated in moderate intermittent physical exercise, whereas a second group (non-exercised controls, n = 9) performed only light work in the barracks. Both groups participated in the same non-physical, classroom-type training and testing. Military training by the exercised group resulted in significant increases in CD4+ T-lymphocytes, renal cortisol excretion and the urinary noradrenaline/adrenaline ratio, together with reductions in neutrophils and the neutrophil/lymphocyte ratio. In the exercised group, the urinary noradrenaline/adrenaline ratio correlated positively with the training-induced changes in CD4+ T-lymphocytes and negatively with changes in the neutrophil/lymphocyte ratio. No significant relationship was found between training-induced increases in cortisol excretion and any of the peripheral blood cell alterations. Our results indicate that 4 weeks of military training consisting of intermittent moderate exercise resulted in a significant increase in CD4+ T-lymphocytes and reduction in neutrophils. These changes were probably driven by alterations in hormonal status, including the significant impact of sympathetic nervous system activation. 相似文献
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Christina Solomonidou Dimitrios Kolokotronis 《Education and Information Technologies》2008,13(3):185-219
This paper mainly describes the role of the multimedia software package ‘Interactions between Objects’ on students’ learning
of mechanical interaction forces and Newton’s laws. We designed and developed this software within social constructivism on
the basis of 226 students’ initial conceptions (categorized in six categories), in order to help students construct appropriate
knowledge about the subject. Teaching with the software was conducted in 13 primary, lower secondary and upper secondary school
classes. In the software’s evaluation research 226 students (aged 11–16) and 13 teachers of the classes participated. Data
analysis showed students’ substantial learning gains with respect to their initial alternative conceptions of the six conceptual
categories. Particularly, the students’ incorrect answers to the post-test questionnaire have perceptibly decreased (a mean
of 65%). In contrast, their correct answers to the questions reached high percentages, from 60% to 90% depending on the question
and the students’ age. Also the teachers’ opinions and comments enhanced software’s evaluation. The contribution of the software’s
specific characteristics on students’ learning is discussed along with implications for designing constructivist science learning
tools. 相似文献
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