Is bioelectrical impedance spectroscopy accurate in estimating changes in fat-free mass in judo athletes?     

CN Matias  DA Santos  DA Fields  LB Sardinha  AM Silva 《Journal of sports sciences》2012,30(12):1225-1233

Abstract Bioelectrical impedance spectroscopy (BIS) provides an affordable and practical assessment of fat-free mass (FFM). However, little information is available on the assessment of changes in fat-free mass in top-level athletes using BIS. The aim of this study was to examine the accuracy of BIS in tracking changes in fat-free mass of elite male judo athletes from a period of weight stability to just before competition, using the four-compartment model (4C model) as reference method. In total, 27 elite male judo athletes (age 22.2?±?2.8 years) were evaluated. Measures of body volume assessed by air displacement plethysmography, bone mineral content by dual-energy X-ray absorptiometry, and total-body water assessed with deuterium dilution were used in a 4C model. Fat-free mass was also assessed by BIS (FFM(BIS)). Changes in FFM(BIS) were not significantly different from measured by the reference method (P?=?0.000). Furthermore, the r (2) was 0.62 and the standard error of the estimate was 1.03 kg. The limits of agreement ranged from -3.36 to 2.59 kg with no bias observed. These findings demonstrate the viability of BIS as a valid tool for tracking fat-free mass in elite male judo athletes. However, based on the wide limits of agreement observed, BIS is less valid at an individual level for tracking fat-free mass in these athletes.  相似文献   

High-frequency resistance training does not promote greater muscular adaptations compared to low frequencies in young untrained men     

Cintia Barcelos  Felipe Damas  Sanmy Rocha Nóbrega  Carlos Ugrinowitsch  Manoel Emílio Lixandrão  Lucas Marcelino Eder Dos Santos 《European Journal of Sport Science》2018,18(8):1077-1082

The aim of the study was to compare the effect of resistance training (RT) frequencies of five times (RT5), thrice- (RT3) or twice- (RT2) weekly in muscle strength and hypertrophy in young men. Were used a within-subjects design in which 20 participants had one leg randomly assigned to RT5 and the other to RT3 or to RT2. 1?RM and muscle cross-sectional area (CSA) were assessed at baseline, after four (W4) and eight (W8) RT weeks. RT5 resulted in greater total training volume (TTV) than RT3 and RT2 (P?=?.001). 1?RM increased similarly between protocols at W4 (RT5: 55?±?9?Kg, effect size (ES): 1.18; RT3: 51?±?11?Kg, ES: 0.80; RT2: 54?±?7?Kg, ES: 1.13; P?P?2, ES: 0.54; RT3: 22.0?±?4.6?cm², ES: 0.19; RT2: ES: 0.25; 23.8?±?3.8?cm²; P?2; ES: 0.69; RT3: 23.6?±?4.2?cm², ES: 0.58; RT2: 25.5?±?3.7?cm²; ES: 0.70; P?2; RT3: 21.2?±?4.0?cm²; RT2: 22.9?±?3.8?cm²). Performing RT5, RT3 and RT2 a week result in similar muscle strength increase and hypertrophy, despite higher TTV for RT5.  相似文献   

Integrating Computational Science Tools into a Thermodynamics Course     

Camilo Vieira  Alejandra J. Magana  R. Edwin García  Aniruddha Jana  Matthew Krafcik 《Journal of Science Education and Technology》2018,27(4):322-333

Computational tools and methods have permeated multiple science and engineering disciplines, because they enable scientists and engineers to process large amounts of data, represent abstract phenomena, and to model and simulate complex concepts. In order to prepare future engineers with the ability to use computational tools in the context of their disciplines, some universities have started to integrate these tools within core courses. This paper evaluates the effect of introducing three computational modules within a thermodynamics course on student disciplinary learning and self-beliefs about computation. The results suggest that using worked examples paired to computer simulations to implement these modules have a positive effect on (1) student disciplinary learning, (2) student perceived ability to do scientific computing, and (3) student perceived ability to do computer programming. These effects were identified regardless of the students’ prior experiences with computer programming.  相似文献   

Biotechnology for Preventive Conservation: Development of Bionanomaterials for Antimicrobial Coating of Outdoor Sculptures     

Nádia Silva  Rob C. Pullar  Manuela E. Pintado  Eduarda Vieira 《文物保护研究》2018,63(5):230-233

ABSTRACT

Outdoor sculptures are part of the sociocultural identity of cities, but are extremely vulnerable to deterioration due to exposure to harsh environmental conditions and climate change. Furthermore, deterioration by micro-organisms renders urgent the need to design protective coatings. This research proposes an integrated methodology for the development of innovative and sustainable nanofilms for applications in the area of art conservation, very specifically in the preventive conservation of outdoor sculptures. Gathering objective data for the characterization of the surface microbiota is important in order to design strategies that make use of bio or nanotechnology innovative coatings. Methodologies for the characterization of the microbiota present in a granite outdoor sculpture, followed by preliminary results on the application of protective antimicrobial coatings for surfaces of cultural objects are described.  相似文献   

Video for teaching: classroom use,instructor self-production and teachers’ preferences in presentation format     

José Miguel Santos Espino  María Dolores Afonso Suárez  Juan José González-Henríquez 《Technology, Pedagogy and Education》2020,29(2):147-162

ABSTRACT

This study explores the use of digital videos in education, from the perspective of the teacher as an agent of technological integration. Secondary and university teachers were surveyed in a region-wide case study. Three topics were specifically surveyed: common uses of digital video in teaching, instructor self-production of educational videos, and preferences in common presentation formats (chalk-and-talk, screencast, PowerPoint, demonstration and whiteboard writing). Results show that secondary teachers make more use of digital video and are more innovative than university teachers. Video self-production is scarce, though respondents declare a positive attitude, with time constraints and technical qualification as main reported obstacles. Preferences in video presentation formats reveal notable differences between secondary and university teachers for some formats. Preferences are also moderately influenced by the teacher’s knowledge field, and by experience with ICT and video production.  相似文献   

The research agenda setting of higher education researchers     

João M. Santos  Hugo Horta 《Higher Education》2018,76(4):649-668

Research agenda setting is a critical dimension in the creation of knowledge since it represents the starting point of a process that embeds individual researchers’ (and the communities that they identify themselves with) interest for shedding light on topical unknowns, intrinsic and extrinsic factors underpinning that motivation, and the ambition and scope of what a research endeavor can bring. This article aims to better understand the setting of individual research agendas in the field of higher education. It does so by means of a recently developed framework on research agenda setting that uses cluster analysis and linear modeling. The findings identify two main clusters defining individual research agenda setting—cohesive and trailblazing—each with a different set of determining characteristics. Further analysis by cross-validation through means of sub-sampling shows that these clusters are consistent for both new and established researchers, and for frequent and “part-time” contributors to the field of higher education. Implications for the field of higher education research are discussed, including the relevance that each research agendas cluster has for the advancement of knowledge in the field.  相似文献   

The Distant Other     

Miguel Franquet Santos Silva  Elena Real Rodríguez  Ana Beriain Bañares  María del Mar López Talavera 《Journalism Practice》2017,11(5):592-605

This study analyses the representation of immigrants in four Spanish national newspapers, El País, El Mundo, La Razón and ABC, between 1 June 2013 and 31 June 2014. Seven days per month were randomly selected, each corresponding to a different day of the week; 91 editions of each paper, 364 in total, were analysed. Of the 289 items relating to immigrants, 179 in which one or more photographs appeared in addition to text were chosen for analysis. Among the main results, two stand out: first, immigrants do not usually have an opportunity to communicate directly with readers and, secondly, the treatment of news items on immigration by the four Spanish newspapers is variable.  相似文献   

Faculty-exchange programs promoting change: motivations,experiences, and influence of participants in the Carnegie Mellon University-Portugal Faculty Exchange Program     

Patrício  Maria Teresa  Santos  Patrícia  Loureiro  Paulo Maia  Horta  Hugo 《Tertiary Education and Management》2018,24(1):1-18

The international mobility of faculty is increasing worldwide. Although studies have considered the experiences of academics abroad, less is known about faculty-exchange programs with policy objectives. This study helps to fill this gap by analyzing a nationwide structured faculty exchange program established by Carnegie Mellon University and Portuguese universities to bring change to Portuguese higher education. The findings are based on interviews with Portuguese program participants, whose motivation to participate and experiences with the program, in addition to the influence of their experience abroad on their home institution, were explored. We find that, although the alignment of individual motivations with institutional interests is important to such programs, the complex transposition of individual experiences to the institutional level may be impeded by cultural resistance as well as resource and organizational constraints. Our exploration of the features that determine the success or failure of these experiences provides insights for policymakers seeking to implement faculty-mobility programs in the future.  相似文献   

The influence of content organization on student's cognitive structure in thermodynamics     

Marco A. Moreira  Carlos A. Santos 《科学教学研究杂志》1981,18(6):525-531

Two different approaches to the content of thermodynamics were used in an introductory college physics course: one was the traditional organization found in most textbooks on the subject, the other was based on the learning theory of David Ausubel. The influence of these different content organizations on the student's cognitive structure was investigated using a word association test which was analysed through hierarchical clustering analysis. Research findings suggest that the approach based on Ausubel's theory influences the student's cognitive structure in such a way that their conceptual hierarchies are more coherent with the basic laws and the conceptual structure of the subject matter.  相似文献   

<Emphasis Type="Italic">WGL</Emphasis>, a web laboratory for geometry     

Pedro Quaresma  Vanda Santos  Milena Marić 《Education and Information Technologies》2018,23(1):237-252

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