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131.
Filipe J. Teixeira Catarina N. Matias Cristina P. Monteiro Maria J. Valamatos Joana F. Reis Robert W. Morton 《Journal of sports sciences》2013,31(17):2037-2044
ABSTRACTLeucine metabolites may reduce training-induced inflammation; however, there is scant evidence for this assertion. We conducted a double-blind randomized controlled pragmatic trial where 40 male participants were allocated into 4 groups: α-hydroxyisocaproic acid group ([α-HICA], n = 10, Fat-free mass [FFM] = 62.0 ± 7.1 kg), β-hydroxy-β-methylbutyrate free acid group ([HMB-FA], n = 11, FFM = 62.7 ± 10.5 kg), calcium β-hydroxy-β-methylbutyrate group ([HMB-Ca], n = 9, FFM = 65.6 ± 10.1 kg) or placebo group ([PLA]; n = 10, FFM = 64.2 ± 5.7 kg). An 8-week whole-body resistance training routine (3 training sessions per week) was employed to induce gains in skeletal-muscle thickness. Skeletal muscle thickness (MT), one repetition maximum (1RM), interleukin-6 (IL-6), high-sensitivity C-reactive protein (hsCRP) and tumour necrosis factor alpha (TNF-α) were assessed at baseline and at the end of weeks 4 and 8. Time-dependent increases were detected from baseline to week 8 for MT (vastus lateralis: p = 0.009; rectus femoris: p = 0.018), 1RM (back squat: α-HICA, 18.5% ± 18.9%; HMB-FA, 23.2% ± 16%; HMB-Ca, 10.5% ± 13.8%; PLA, 19.7% ± 9% and bench press: α-HICA, 13.8% ± 19.1%; HMB-FA, 15.5% ± 9.3%; HMB-Ca, 10% ± 10.4%; PLA, 14.4 ± 11.3%, both p < 0.001), IL-6, hsCRP (both p < 0.001) and TNF-α (p = 0.045). No differences were found between groups at any time point. No leucine metabolite attenuated inflammation during training. Additionally, backwards elimination regressions showed that no circulating inflammatory marker consistently shared variance with the change in any outcome. Using leucine metabolites to modulate inflammation cannot be recommended from the results obtained herein. Furthermore, increases in inflammatory markers, from training, do not correlate with any outcome variable and are likely the result of training adaptations. 相似文献
132.
Juan Del Coso Cristina González Javier Abian-Vicen Juan José Salinero Martín Lidon Soriano Francisco Areces 《Journal of sports sciences》2013,31(18):1680-1687
AbstractTriathlon is a popular outdoor endurance sport performed under a variety of environmental conditions. The aim of this study was to assess physiological variables before and after a half-ironman triathlon in the heat and to analyse their relationship with performance. Thirty-four well-trained triathletes completed a half-ironman triathlon in a mean dry temperature of 29 ± 3ºC. Before and within 1 min after the end of the race, body mass, core temperature, maximal jump height and venous blood samples were obtained. Mean race time was 315 ± 40 min, with swimming (11 ± 1%), cycling (49 ± 2%) and running (40 ± 3%) representing different amounts of the total race time. At the end of the competition, body mass changed by ?3.8 ± 1.6% and the change in body mass correlated positively with race time (r = 0.64; P < 0.001). Core temperature increased from 37.5 ± 0.6ºC to 38.8 ± 0.7ºC (P < 0.001) and post-race core temperature correlated negatively with race time (r = ?0.47; P = 0.007). Race time correlated positively with the decrease in jump height (r = 0.38; P = 0.043), post-race serum creatine kinase (r = 0.55; P = 0.001) and myoglobin concentrations (r = 0.39; P = 0.022). In a half-ironman triathlon in the heat, greater reductions in body mass and higher post-competition core temperatures were present in faster triathletes. In contrast, slower triathletes presented higher levels of muscle damage and decreased muscle performance. 相似文献
133.
Cristina P. Albuquerque 《Reading and writing》2012,25(4):775-797
This study analyzed the relation and the specific influence of rapid naming (RN) on different reading (decoding accuracy and
reading fluency) and writing components (spelling accuracy and fluency in composition) of European Portuguese. Moreover, it
also compares the influence of Rapid Automatized Naming (RAN) tests (colors, digits) and of a Rapid Alternating Stimulus (RAS)
test (shapes and colors). In a sample composed by normally achieving children, 70 in the first grade and 69 in the second
grade, the results show that, when phonemic awareness is controlled, RN is a significant concurrent predictor of reading and
writing performance. Its impact occurs mainly on reading fluency and is carried out predominantly by the RAN digit test. Nevertheless,
the RAN color test and the RAS shape and color test also significantly predicted reading and writing performance. The results
also indicate that RN has less impact on writing than on reading, and that, when compared with phonemic awareness, it is associated
with distinct written language components. When combined, the data obtained are consistent with the orthographic characteristics
of European Portuguese. 相似文献
134.
135.
Silvia Cristina Bettez 《International journal of qualitative studies in education》2013,26(8):932-954
For graduate students and other emerging qualitative researchers, the ever-evolving and sometimes conflicting perspectives, methodologies, and practices within various post-positivist frameworks (e.g. feminist, critical, Indigenous, participatory) can be overwhelming. Qualitative researchers working within postmodern contexts of multiplicity and ambiguity are tasked with working through challenges – related to methods, interpretation, and representation – throughout the research process. Through examining related literature and incorporating my own experiences, I explore ethical dilemmas that social justice-oriented qualitative researchers may encounter as a result of conflicting multiplicities of difference among researcher(s), participants, and readers. Such dilemmas include incongruent interpretations between participants and researchers, and participants’ and researchers’ conflicting desires about what should be shared, intercultural (mis)interpretations, rapport issues, and conflicts between research life and home life. I consider how combining the practices of attending to assemblages, engaging in critical reflexivity, and centralizing communion may be useful in navigating relationships and ethical dilemmas in qualitative research. 相似文献
136.
Carlos Gómez Filomena Sos Cristina B. Randall Encarna Vaquero 《Infancia y Aprendizaje》2013,36(56):105-122
ResumenSe ha realizado un estudio observacional con metodología etológica en niños de 4–5 años: Un grupo de 5 Ss. procedentes de una Casa Cuna y otro grupo de 7 Ss. procedentes de un ambiente familiar. El muestreo se llevó a cabo en un hábitat común para ambos grupos: el recreo de un preescolar, ubicado en otra zona, y en condiciones de juego libre, aunque controlado por monitores adultos. Los resultados obtenidos sugieren la existencia de diferencias entre ambos grupos, que podrían implicar una manera diferente de integración social de los niños cuyo hábitat primario no es la casa familiar, aunque no es posible establecer una relación de causalidad directa con la institucionalización. 相似文献
137.
Amparo Moreno Gerardo Echeita Elena Martín Cristina del Barrio 《Infancia y Aprendizaje》2013,36(30):69-79
ResumenSe examina la comprensión infantil de algunas nociones de la teoría de conjuntos en una muestra de sesenta niños madrileños entre 6 y 11 años de edad. El análisis se centra en la definición y reconocimiento de conjuntos por parte de los niños, la formación de conjuntos a partir de un material dado y la conciencia de la utilidad de los conjuntos y su relación con otras áreas de las Matemáticas. Los resultados indican que más del 50% de los sujetos identifica el conjunto con el diagrama que lo representa y son incapaces de aplicar esas nociones a problemas concretos. Se interpretan estas dificultades a la luz de la descripción piagetiana de los dos tipos de abstracción—empírica y reflexiva—, y los dos tipos de conocimiento—físico y lógico-matemático—a que dan lugar. 相似文献
138.
Cristina Marín Nora Scheuer María-Puy Pérez-Echeverría 《European Journal of Psychology of Education - EJPE》2013,28(3):781-805
This paper studies conceptions of woodwind students regarding learning and teaching music, within the framework of implicit theories. It analyzes whether there are differences related to participants’ instruction level, and whether it is possible to identify profiles according to their conceptions. Sixty-eight students from three different levels at 14 Spanish conservatories took part voluntarily in this study. A multiple-choice questionnaire was used, which comprised 16 dilemmas on different situations typical of learning and teaching music. Three answers were presented for each dilemma, corresponding to the three implicit theories identified in recent years: direct, interpretative, and constructive. For each dilemma, participants were requested to choose the option they most agreed with and the one they least agreed with. Data were analyzed using chi-square tests of independence, multiple correspondence analysis, and ascending hierarchical classification. From the results obtained we can state that as students’ age and level of instruction increase, so does the level of sophistication of their conceptions. Three conceptual profiles were identified: direct, direct-interpretative, and constructive, which are consistent with prior results on conceptions of teaching and learning in other domains. Implications for education are discussed. 相似文献
139.
Richard R. Rosenkranz Karly S. Geller Mitch J. Duncan Cristina M. Caperchione Corneel Vandelanotte Anthony J. Maeder 《Measurement in physical education and exercise science》2018,22(4):322-331
This cross-sectional study of 504 community-dwelling Australian adults (328 females, 176 males, mean age 50.8 ± 13.0 years) sought to examine the reliability and validity of measurement scales for physical activity (PA) self-efficacy and outcome expectations. Participants completed demographic and anthropometric measurements, and a 23-item psychosocial questionnaire pertinent to an intervention target of 10,000 steps per day. Exploratory (n = 252) and confirmatory (n = 252) factor analyses were conducted to determine psychometric properties of the measures. Based on theory and goodness-of-fit indices, six factors were extracted from the questionnaire: PA self-efficacy; PA barriers self-efficacy (including general, personal, and conflict); and physical and mental outcome expectations. From confirmatory factor analysis, the model demonstrated good data fit in four out of five indices: CFI = 0.99; TLI = 0.99; SRMR = 0.03; RMSEA = 0.03, 90%CI = 0.01–0.05, χ2 = 113.14 (88), p = 0.04; including good fit by sex, age, weight status, education, and birth country. PA interventions can employ our psychometrically sound social cognitive measures. 相似文献
140.
Cristina Moral Ana Martín-Romera Estefanía Martínez-Valdivia Marta Olmo-Extremera 《School Leadership & Management》2018,38(1):32-52
The paper we present here is part of the International Successful School Principalship Project (ISSPP), which is designed to analyse the characteristic traits of successful leadership in different contexts and countries [Day, C., and K. Leithwood. 2007. Successful School Leadership in Times of Change. Dordrecht: Springer-Kluwer; Day, C., and D. Gurr. 2014. Leading School Successfully. Stories from the Field. London: Routledge]. One subgroup of the Spanish research team participating in the ISSPP at the University of Granada has contributed to the project by carrying out a comparative study of the type of leadership for learning at four secondary schools in disadvantaged contexts. Following ISSPP data collection protocols and using a category system specially designed to analyse the leadership for learning carried out by the four principals, the results show that four secondary schools have principals with a similar traits, dispositions and value systems; however, the secondary schools with the best academic results employed practices and strategies more closely associated with leadership for learning than schools with poorer academic results. The data provided by this study confirm the traits and strategies that the ISSPP has been identifying in successful principals in disadvantaged contexts in various countries. It also serves as a source of reflection and discussion on the type of leadership for learning present in some disadvantaged secondary schools in Spain. 相似文献