bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of Dynamic Neuromuscular Stabilization Approach on Maximum Kayak Paddling Force
Authors: Davidek Pavel , Andel Ross , Kobesova Alena 
Published: March 2018

Abstract
The purpose of this study was to examine the effect of Dynamic Neuromuscular Stabilization (DNS) exercise on maximum paddling force (PF) and self-reported pain perception in the shoulder girdle area in flatwater kayakers. Twenty male flatwater kayakers from a local club (age = 21.9 ± 2.4 years, body height = 185.1 ± 7.9 cm, body mass = 83.9 ± 9.1 kg) were randomly assigned to the intervention or control groups. During the 6-week study, subjects from both groups performed standard off-season training. Additionally, the intervention group engaged in a DNS-based core stabilization exercise program (quadruped exercise, side sitting exercise, sitting exercise and squat exercise) after each standard training session. Using a kayak ergometer, the maximum PF stroke was measured four times during the six weeks. All subjects completed the Disabilities of the Arm, Shoulder and Hand (DASH) questionnaire before and after the 6-week interval to evaluate subjective pain perception in the shoulder girdle area. Initially, no significant differences in maximum PF and the DASH questionnaire were identified between the two groups. Repeated measures analysis of variance indicated that the experimental group improved significantly compared to the control group on maximum PF (p = .004; Cohen’s d = .85), but not on the DASH questionnaire score (p = .731) during the study. Integration of DNS with traditional flatwater kayak training may significantly increase maximum PF, but may not affect pain perception to the same extent.
Functional Movements in Japanese Mini-Basketball Players
Authors: Kuzuhara Kenji , Shibata Masashi , Iguchi Junta , Uchida Ryo 
Published: March 2018

Abstract
Functional movement screen (FMS) has been used to establish normative data and determine potential injury risk for young adults and athletes, but there are few data in elementary school-age children. The purpose of this study was to establish fundamental values for the FMS in elementary school-age mini-basketball players. Secondary purposes were to examine relationships between functional movement patterns and age, peak height velocity (PHV), and body mass index (BMI), and to compare functional movement patterns between boys and girls and between individuals with and without a history of injury. The mean composite FMS score was 16.5 ± 2.2 (16.5 ± 2.4 for boys, 16.5 ± 1.7 for girls). The composite FMS score was positively correlated with age (r = .312) and negatively correlated with the BMI (r = − .371). However, the FMS score was not correlated with PHV or with PHV age. The FMS score was not different between boys and girls or between individuals who reported a previous injury and those who did not. However, boys in the mini-basketball teams performed better than girls on the trunk stability push-up and rotary stability tests. Age and the body mass index were significantly associated with better and poorer functional movement, respectively.
Effects of Different Post-Activation Potentiation Warm-Ups on Repeated Sprint Ability in Soccer Players from Different Competitive Levels
Authors: Sanchez-Sanchez Javier , Rodriguez Alejandro , Petisco Cristina , Ramirez-Campillo Rodrigo , Martínez Cristian , Nakamura Fábio Y. 
Published: March 2018

Abstract
This study aimed to compare the effects of a traditional warm-up with two post-activation potentiation (PAP) warm-up strategies on the repeated sprint ability (RSA) of soccer players from national (NL) and regional (RL) competitive levels. Sixteen young players (NL, n = 8, age = 20.7 ± 1.4 y, body mass = 68.5 ± 7.0 kg, body height = 177.4 ± 5.2 cm; RL, n = 8, age = 20.8 ± 1.0 y, body mass = 68.7 ± 4.0 kg, body height = 176.6 ± 5.6 cm) were recruited to complete a traditional warm-up (CONTROL), a PAP warm-up incorporating squats with a load (~60% 1RM) that allowed a high speed (1 m/s) of movement and a high number of repetitions (PAP-1), and a PAP warm-up with a load (~90% 1RM) that allowed a moderate speed (0.5 m/s) of movement and a reduced number of repetitions (PAP-0.5). A RSA test (six 20-m sprints with 20 s of recovery) was performed 5 min after the PAP warm-up to assess the effects of the different protocols on the fastest sprint (RSAb) and the mean time of all sprints (RSAm). A meaningful improvement of RSA performance was observed with PAP-0.5, attaining a large effect on NL (RSAb, ES = -1.5; RSAm, ES = -1.3) and only a small effect on RL athletes (RSAb and RSAm, ES = -0.2). Moreover, when each RSA sprint performance was compared between NL and RL players, after PAP-0.5 greater performance for all sprints was observed in the NL players. Therefore, adding a heavy strength-based conditioning exercise during the warm-up prior to a RSA test may induce significant performance improvements in NL, but only small effects in RL players.
Modelling and Predicting Backstroke Start Performance Using Non-Linear And Linear Models
Authors: de Jesus Karla , Ayala Helon V. H. , de Jesus Kelly , Coelho Leandro dos S. , Medeiros Alexandre I.A. , Abraldes José A. , Vaz Mário A.P. , Fernandes Ricardo J. , Vilas-Boas João Paulo 
Published: March 2018

Abstract
Our aim was to compare non-linear and linear mathematical model responses for backstroke start performance prediction. Ten swimmers randomly completed eight 15 m backstroke starts with feet over the wedge, four with hands on the highest horizontal and four on the vertical handgrip. Swimmers were videotaped using a dual media camera set-up, with the starts being performed over an instrumented block with four force plates. Artificial neural networks were applied to predict 5 m start time using kinematic and kinetic variables and to determine the accuracy of the mean absolute percentage error. Artificial neural networks predicted start time more robustly than the linear model with respect to changing training to the validation dataset for the vertical handgrip (3.95 ± 1.67 vs. 5.92 ± 3.27%). Artificial neural networks obtained a smaller mean absolute percentage error than the linear model in the horizontal (0.43 ± 0.19 vs. 0.98 ± 0.19%) and vertical handgrip (0.45 ± 0.19 vs. 1.38 ± 0.30%) using all input data. The best artificial neural network validation revealed a smaller mean absolute error than the linear model for the horizontal (0.007 vs. 0.04 s) and vertical handgrip (0.01 vs. 0.03 s). Artificial neural networks should be used for backstroke 5 m start time prediction due to the quite small differences among the elite level performances.
Aerobic Fitness of Starter and Non-Starter Soccer Players in the Champion’s League
Authors: Paraskevas Giorgos , Hadjicharalambous Marios 
Published: March 2018

Abstract
To identify individual response patterns in selected aerobic fitness variables of regular starters (ST; N = 7) and non-starters (Non-ST; N = 10), top level professional soccer players were tested for maximal oxygen uptake (VO2max), velocity at 4 mM of lactate (V4), velocity at maximal oxygen uptake (νVO2max) and oxygen pulse (O2-pulse) in July and December following consecutive periods of fixture congestion. V4 was the only variable that increased significantly in December compared to July (15.1 ± 0.5 vs. 14.6 ± 0.5, p = 0.001). There was an almost certain beneficial large mean team change for V4 (ES = 1.2 (0.67; 1.57), 100/0/0), while beneficial mean team changes were less likely for νVO2max and O2-pulse [ES = 0.31 (-0.08; 0.70), 68/30/2 and ES = 0.24 (0.01; 0.49), 64/36/0, respectively] and unclear for VO2max (ES = 0.02 (-0.31; 0.70), 18/69/13). With the exception of V4 where 10 out of 17 players (7 ST and 3 Non-ST) showed positive changes higher than the biological variability, all other variables were characterized by a substantial proportion of changes lower than the biological variability. The present study demonstrated that aerobic fitness variables that require maximal effort may be characterized by greater variability of the individual response pattern compared to that of submaximal aerobic fitness variables irrespective of the accumulated game time. Submaximal aerobic fitness variables appear to be more informative in the physiological evaluation of top level soccer players and this may be an advantage during exposure to periods of consecutive games.
Muscle Activity in Upper-Body Single-Joint Resistance Exercises with Elastic Resistance Bands vs. Free Weights
Authors: Bergquist Ronny , Iversen Vegard Moe , Mork Paul J , Fimland Marius Steiro 
Published: March 2018

Abstract
Elastic resistance bands require little space, are light and portable, but their efficacy has not yet been established for several resistance exercises. The main objective of this study was to compare the muscle activation levels induced by elastic resistance bands versus conventional resistance training equipment (dumbbells) in the upper-body resistance exercises flyes and reverse flyes. The level of muscle activation was measured with surface electromyography in 29 men and women in a cross-over design where resistance loadings with elastic resistance bands and dumbbells were matched using 10-repetition maximum loadings. Elastic resistance bands induced slightly lower muscle activity in the muscles most people aim to activate during flyes and reverse flies, namely pectoralis major and deltoideus posterior, respectively. However, elastic resistance bands increased the muscle activation level substantially in perceived ancillary muscles, that is deltoideus anterior in flyes, and deltoideus medius and trapezius descendens in reverse flyes, possibly due to elastic bands being a more unstable resistance modality. Overall, the results show that elastic resistance bands can be considered a feasible alternative to dumbbells in flyes and reverse flyes.
Validation and Reliability of the Korean Version of the Sport Anxiety Scale-2
Authors: Cho Seongkwan , Choi Hunhyuk , Eklund Robert C. , Paek Insu 
Published: March 2018

Abstract
The main purpose of the present study was to examine the validation and reliability of the Korean version of the Sport Anxiety Scale (SAS-2Kr) by evaluating its factorial invariance across gender. A total of 303 Korean collegiate athletes (198 males and 105 females) from 9 sports participated in the study, and they completed the demographic questionnaire and the SAS-2Kr containing 15 items to measure multidimensional trait anxiety and individual differences in the cognitive and somatic anxiety experienced by athletes. The results of this study indicated that the construct validity in the SAS-2Kr was well established in that the values of the standardized factor loadings, composite reliability, and average variance extracted values were above the recommended cutoff points. The multiple-sample confirmatory factor analyses showed the SAS-2Kr could be generalizable across gender in college samples. The results also indicated that the SAS-2Kr supported the original 3-factor model of SAS-2 in English consisting of somatic anxiety, worry, and concentration disruption, and thus this study provides useful information for researchers to understand the athletes’ tendency to experience anxiety reactions in sport situations. Suggestions for future research on competitive trait anxiety are provided in the discussion section.
Humor as a developmental phenomenon: the contributions of Paul McGhee
Authors: Bergen Doris 
Published: March 2018

AbstractThis chapter traces the history of Paul McGhee’s theoretical views, research methods, and body of writing focused on children’s humor development. It describes the state of such research before he became involved, the decision-making process that led him to focus on this area of knowledge, his initial research paradigms and later research methodology, his extensive writings on humor development, and the theoretical ideas about children’s humor development that he proposed, drawing on Piagetian theory. It also briefly discusses his later work in broader fields of humor development. The chapter briefly describes the ways that the body of knowledge he provided and his emphasis on the importance of early humor development have been influential for many subsequent humor development researchers, including that of the author. It also recognizes the playfulness that Paul McGhee has brought to both his scholarly and advocacy work, which provides a model for future researchers in the field of children’s humor development.
Second Law Analysis of MHD Squeezing Flow of Casson Fluid Between Two Parallel Disks
Authors: Ojjela Odelu , Ramesh Kesetti , Das Samir K. 
Published: March 2018

AbstractThe present article deals the entropy generation due to heat and mass transfer of an unsteady MHD flow of a Casson fluid squeezed between two parallel disks. The upper disk is taken to be impermeable and the lower one is porous. The flow field equations are reduced to non-linear ordinary differential equations by using similarity transformations and the resulting ODE problem is solved by shooting technique with Runge-Kutta 4thorder method. The effects of various non dimensional fluid and geometric parameters on the velocity components, temperature, concentration, entropy generation number, Bejan number, skin friction and Nusselt number are illustrated through graphs and tables. It is noticed that the temperature of the fluid is enhanced with Eckert number, whereas the concentration of the fluid decreased with Casson fluid parameter. The present study is applicable to nuclear engineering cooling systems, wire and blade coating, extrusion of polymer fluids, optical fibers, magnetohydrodynamics and optimization of chemical engineering processes.
Experimental Study on Thermal and UV-enhanced Gas-Solid Chlorination of High-Density Polyethylene
Authors: Zhang Xiong , Yang Qianli , Mao Ding , Cheng Yi 
Published: March 2018

Abstract
The dynamic process of gas-solid chlorination of high-density polyethylene (HDPE) was revealed using a vibrated-bed reactor, where a UV-Vis measurement system was used to record the kinetics of chlorination online. Thermal and UV-enhanced chlorination at fixed temperature below the melting point (Tm) of HDPE were firstly investigated. It was observed that UV irradiation could accelerate the reaction rate. However, all of the prepared chlorinated polyethylene (CPE) products had unchlorinated crystal structures and a limitation of chlorine content. Multi-stage chlorination was hence designed for more homogeneous chlorination and decreasing the residual crystallinity. The differential scanning calorimetry (DSC) results showed effective decrease of the melting enthalpy (ΔHm) while the final reaction temperature was beyond Tm. Meanwhile, the presence of -CH = CH- bonds in the polymer chain revealed by solid-state nuclear magnetic resonance (S-NMR) indicated that the final reaction temperature should not be higher than 150 °C.
Using the Business Model Canvas (BMC) strategy tool to support the Play4Guidance online entrepreneurial game
Authors: Crotty Yvonne , Kinney Tom , Farren Margaret 
Published: March 2018

Abstract
The Erasmus + Play4Guidance (P4G) project introduces an online business game, designed to help teach entrepreneurial, transversal and mathematical skills using a real-world business environment. This paper explains how the Business Model Canvas (BMC) strategy tool facilitated student understanding of real life business development prior to playing the game. An initial mapping exercise was conducted to find out if the Business Model Canvas could transform the experience of playing the game by providing an overview of real life business strategy, and explain the crucial role that markets and customers play in business growth. As a result of the mapping exercise a workshop session was developed to ensure that students could enact the real life business scenarios presented in the game. Three different types of videos were produced and integrated into the workshop to demonstrate key entrepreneurial competencies and graphically illustrate the nine key building blocks of the BMC. Survey responses from a student cohort evidenced that the workshop was central in helping them to understand real life business strategy prior to playing the game.
Object orientation in the literature and in education
Authors: Berges Marc 
Published: March 2018

Abstract
The efforts around the world – CS4All in the U.S. or Computing At School in Great Britain – show that computing literacy is seen as important. One important part of computer science education deals with learning programming. So, object orientation should be in focus. But what is object orientation? Several different definitions are presented, and a definition of object orientation by its fundamental concepts is introduced. Furthermore, several educational “paradigms” are discussed. Additionally, a choice of object-oriented programming languages is presented. After all that theoretical background, some exemplary implementations of object orientation in national (German) and international curricula are shown. All in all, the article provides a broad overview of the topic of object-oriented programming in computer science education.
Computing in the classroom: Tales from the chalkface
Authors: Sentance Sue , Waite Jane 
Published: March 2018

Abstract
Computing, a broad discipline including computer science, information technology and digital literacy, was introduced as a mandatory national curriculum subject in England in 2014. This meant the introduction of both computer programing and more academic computer science into the curriculum. Such a significant curriculum change involves a period of transition, lasting several years. Here we consider what we have learned about the implementation of the new curriculum, the external influences that have come to bear on teachers’ and pupils’ experiences, and the challenges that are faced.
Empowering learners with tools in CS education: Physical computing in secondary schools
Authors: Przybylla Mareen , Romeike Ralf 
Published: March 2018

AbstractIn computer science, computer systems are both, objects of investigation and tools that enable creative learning and design. Tools for learning have a long tradition in computer science education. Already in the late 1960s, Papert developed a concept which had an immense impact on the development of informal education in the following years: his theory of constructionism understands learning as a creative process of knowledge construction that is most effective when learners create something purposeful that they can try out, show around, discuss, analyse and receive praise for. By now, there are numerous learning and programming environments that are based on the constructionist ideas. Modern tools offer opportunities for students to learn in motivating ways and gain impressive results in programming games, animations, implementing 3D models or developing interactive objects. This article gives an overview of computer science education research related to tools and media to be used in educational settings. We analyse different types of tools with a special focus on the categorization and development of tools for student adequate physical computing activities in the classroom. Research around the development and evaluation of tools and learning resources in the domain of physical computing is illustrated with the example of “My Interactive Garden”, a constructionist learning and programming environment. It is explained how the results from empirical studies are integrated in the continuous development of the learning material.
Interacting with personal fabrication devices
Authors: Mueller Stefanie 
Published: March 2018

AbstractPersonal fabrication tools, such as 3D printers, are on the way of enabling a future in which non-technical users will be able to create custom objects. While the hardware is now affordable and the number of people who own a 3D printer is increasing, only few create new 3D models. Most users download models from a 3D model database and after downloading fabricate them on their 3D printers. At most, users adjust a few parameters of the model, such as changing its color or browsing between predetermined shape options.I argue that personal fabrication has the potential for more: Instead of only consuming existing content, I envision a future in which non-technical users will create objects only trained experts can create today. While there are many open challenges for human-computer interaction, such as abstracting away the necessarydomainandmachineknowledge, I focus on improving theinteraction modelunderlying current personal fabrication devices.In this article, I illustrate why today’s interaction model for personal fabrication tools is not suitable for non-technical users. For this, I draw an analogy to the development of the user interface in personal computing and show how solutions developed by human-computer interaction researchers over the last decades can be applied to this new domain. I analyze the challenges when creating interactive systems for personal fabrication and describe six research prototypes I built to overcome these challenges. I discuss the limitations of these systems and conclude with an overview of recent advancements in personal fabrication that will allow us to go beyond what is possible today.
MY English: a social constructivist perspective on ELF
Authors: Kohn Kurt 
Published: March 2018

AbstractIn this article, I address issues, concepts and empirical insights that have profoundly shaped my view of English as a lingua franca (ELF) and of the pedagogical lessons to be learned for English Language Teaching (ELT). Starting from discrepancies in my ELF identity as a speaker of English with ELT roots in a German secondary school, I argue for the social constructivist concept of MY English as a basis for understanding ELF competence development and the tensions surrounding the relationship between ELT and ELF. Continually shaped by speakers’ participation in ELF communication, relevant dimensions of their MY English profiles include linguistic-communicative-communal repertoires and requirements of performance, individual and social identity orientations, and confidence in their ELF creativity. Against this backdrop, I discuss topics I consider relevant for a much-needed pedagogical reconciliation of ELT with ELF. Special attention is given to teachers’ ELF apprehension and the distinction between a “strict” (quasi-behaviouristic) and an “open” (social constructivist) target language orientation, speaker satisfaction as a criterion of success in ELF communication, and teaching towards ELF competence from awareness raising to comprehension, production and interaction to non-native speaker emancipation. Successful ELF implementation in both ELT practice and ELT teacher education requires extensive and authentic involvement of students and teachers in ELF communication. Intercultural telecollaboration provides innovative means for creating a space for ELF communication in the ELT classroom. Pedagogical case studies about video and text chat conversations strongly support the assumption that using their common target language as a lingua franca significantly enableslearnersof English to develop an emancipated non-native speaker identity and thus to becomespeakersof English in their own right. And what is more, the pedagogical lingua franca approach can be successfully transferred to other foreign target languages as well. I conclude my article with a brief contextualization of the MY English concept in relation to translingual practice and ELF languaging.