Antioxidant response and oxidative damage induced by a swimming session: influence of gender     

Tauler P  Ferrer MD  Romaguera D  Sureda A  Aguilo A  Tur J  Pons A 《Journal of sports sciences》2008,26(12):1303-1311

In this study, we examined oxidative stress after a swimming session, the responses of the antioxidant defences, and the influence of gender on these responses. Fifteen boys and eight girls participated voluntarily in the study. Plasma concentrations of 17-beta-estradiol, vitamin E, retinol, carotenes, ascorbate, malondialdehyde, and the carbonyl index were determined. Creatine kinase, gamma glutamyl transpeptidase, and lactate dehydrogenase activities, as well as glucose, urea, urate, cholesterol, and triglycerides, were determined in serum. Plasma concentrations of 17-beta-estradiol were higher in girls than in boys. Exercise increased plasma ascorbate both in boys and in girls. Malondialdehyde increased in boys but was maintained in girls after exercise. Creatine kinase values corrected for lean body mass were similar in boys and girls at baseline, but the post-exercise values in boys were higher than in girls. A positive correlation was observed in boys, but not in girls, between plasma malondialdehyde and creatine kinase corrected concentrations. Furthermore, a negative correlation was observed between the increase in circulating neutrophils and in creatine kinase activity in girls but not in boys. In conclusion, a swimming session induced higher muscular and oxidative damage in boys than in girls.  相似文献   

Team cohesion and ethnic–cultural identity in adolescent migrant athletes     

Eleftheria Morela  Antonis Hatzigeorgiadis  Olga Kouli  Anne-Marie Elbe  Xavier Sanchez 《Int J Intercult Relat》2013

The purpose of this study was to examine the role of sport participation in the social integration of adolescents with non-dominant ethnic and cultural backgrounds. In particular, this study investigated the relationship between team cohesion and ethnic–cultural identity. Participants were 83 young migrant athletes (mean age 15.60 years). Participants completed the Ethnic/Cultural Identity Salience Questionnaire and the Youth Sport Environment Questionnaire. Regression analyses showed that cohesion negatively predicted feelings of fringe and lack of interaction. Our findings suggest that sport participation, particularly in cohesive teams, can facilitate the development of adaptive identity toward the goal of social integration in migrant adolescents.  相似文献   

Indigenous languages and intercultural bilingual education in Bolivia     

Xavier Albó  Lucía d'Emilio 《Prospects》1990,20(3):321-329

Cofounder of the Centre for Research into and Promotion of the Peasantry (CIPCA). Author of, among other works, Los mil rostros del quechuaand Lengua y sociedad boliviana,and editor of Raíces de América: el mundo Aymara and Para comprender las culturas rurales en Bolivia.  相似文献   

Effects of intensive use of computers in secondary school on gender differences in attitudes towards ICT: A systematic review     

Roser Cussó-Calabuig  Xavier Carrera Farran  Xavier Bosch-Capblanch 《Education and Information Technologies》2018,23(5):2111-2139

There is a wealth of interventions focusing on the intensive use of computers in secondary schools, largely aiming at improving students’ performance. However, global evidence on the effects of the use of computers on attitudinal outcomes has not been synthesised so far. Taking into account that the differences in the attitudes of boys and girls regarding the use of computers are one of the factors described as causes of the low number of girls following ICT studies, the aim of this article is to review the evidence on the effects of intensive use of computers in schools on gender differences in attitudes outcomes: anxiety, enjoyment, self-confidence and self-efficacy. Searches generated a total of 740 citations of which 59 were identified as relevant and nine were finally included. The methodological quality of included studies was poor to moderate. The results suggest that despite the intensive use of computers, boys are favoured in computer anxiety, self-confidence and self-efficacy; and suggest no differences in computer enjoyment. There is no evidence that intensive use of computers reduce gender differences in these outcomes. Further policy recommendations should be rooted on robust evaluations, which take into account implementations parameters, as well.  相似文献   

The interplay between input and initial biases: asymmetries in vowel perception during the first year of life     

Pons F  Albareda-Castellot B  Sebastián-Gallés N 《Child development》2012,83(3):965-976

Vowels with extreme articulatory-acoustic properties act as natural referents. Infant perceptual asymmetries point to an underlying bias favoring these referent vowels. However, as language experience is gathered, distributional frequency of speech sounds could modify this initial bias. The perception of the /i/-/e/ contrast was explored in 144 Catalan- and Spanish-learning infants (2 languages with a different distribution of vowel frequency of occurrence) at 4, 6, and 12 months. The results confirmed an acoustic bias at 4 and 6 months in all infants. However, at 12 months, discrimination was not affected by the acoustic bias but by the frequency of occurrence of the vowel.  相似文献   

How do teachers coordinate their work? A framing approach     

Xavier Dumay 《International journal of qualitative studies in education》2013,26(1):88-109

Since the 1970s, schools have been characterized as loosely coupled systems, meaning that the teachers’ work is weakly coordinated at the local level. Nonetheless, few studies have focused on the local variations of coordination modes, their sources and their nature. In this article, the process of local coordination of the teachers’ work is analyzed, using a sociocognitive approach. A longitudinal study of the framing process conducted during two years in one school is presented, in order to capture the parallel evolution of the teachers’ cognitive structures and the school’s social structures. The results show that: (1) the framing process is at the heart of political games, meaning that the local definition of teaching and its conditions represent an important issue for the teachers; and that (2) the cognitive structures that emerge from the framing process appear to some extent to be decoupled from the teachers’ actual practices, contributing only partially to the local process of the teachers’ work coordination.  相似文献   

Preservice Science Teachers' Perceptions of Their Practicum Classrooms     

Xavier Fazio  Louis Volante 《The Teacher Educator》2013,48(2):126-144

Practicum experiences in schools are highly valued in science teacher education programs. Yet, there are few studies examining secondary preservice science teachers' practicum classrooms. This mixed-methods study explored secondary preservice science teachers' perceptions of their practicum classroom learning environments, interpreted from an open-ended survey questionnaire, as well as from an adapted version of the Constructivist Learning Environment Survey (CLES; Taylor, Fraser, & Fisher, 1997). Twenty-two preservice teachers within secondary science methods courses volunteered to complete the survey. Qualitative survey findings were corroborated by quantitative results from the CLES survey. Overall, the preservice teachers perceived their practicum classrooms to incorporate some constructivist learning environment factors, but the critical constructivist perspective underpinning the survey was not found. Additionally, innovative practices cogent with these practices were not supported by most of their co-operating teachers. Implications of how preservice education programs can better support prospective science teachers' views and practices during practicum are discussed.  相似文献   

Children's creative potential: An empirical study of measurement issues     

Todd Lubart  Chantal Pacteau  Anne-Yvonne Jacquet  Xavier Caroff 《Learning and individual differences》2010,20(4):388-392

Relations between measures of creative potential and different scoring methods were examined in 154 French schoolchildren. The Test for Creative Thinking — Drawing Production (TCT-DP), parallel lines task from the Torrance Test for Creative Thinking, and an object-based creative drawing task were used. Factor analysis of TCT-DP subscores showed an originality factor and an appropriateness factor. The relations between these factors, judge's creativity ratings of the same drawings, and statistical originality scores based on the frequency of elements in the drawings were tested by means of a LISREL model. Moreover, TCT-DP scores correlated positively but weakly with performance in the parallel lines task and the object-based drawing task.  相似文献   

NARCISSE     

Xavier Perrot 《Archives and Museum Informatics》1993,7(4):4-6

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Standards     

Xavier Perrot 《Archives and Museum Informatics》1990,4(4):13-16

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