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Luciano A. Silva Camila B. Tromm Guilherme Da Rosa Karoliny Bom Thais F. Luciano Talita Tuon 《Journal of sports sciences》2013,31(11):1164-1176
Abstract Thirty-six male rats were used; divided into 6 groups (n = 6): saline; creatine (Cr); eccentric exercise (EE) plus saline 24 h (saline + 24 h); eccentric exercise plus Cr 24 h (Cr + 24 h); eccentric exercise plus saline 48 h (saline + 48 h); and eccentric exercise plus Cr 48 h (Cr + 48h). Cr supplementation was administered as a solution of 300 mg · kg body weight?1 · day?1 in 1 mL water, for two weeks, before the eccentric exercise. The animals were submitted to one downhill run session at 1.0 km · h?1 until exhaustion. Twenty-four and forty-eight hours after the exercise, the animals were killed, and the quadriceps were removed. Creatine kinase levels, superoxide production, thiobarbituric acid reactive substances (TBARS) level, carbonyl content, total thiol content, superoxide dismutase, catalase, glutathione peroxidase, interleukin-1b (IL-1β), nuclear factor kappa B (NF-kb), and tumour necrosis factor (TNF) were analysed. Cr supplementation neither decreases Cr kinase, superoxide production, lipoperoxidation, carbonylation, total thiol, IL-1β, NF-kb, or TNF nor alters the enzyme activity of superoxide dismutase, catalase, and glutathione peroxides in relation to the saline group, respectively (P < 0.05). There are positive correlations between Cr kinase and TBARS and TNF-α 48 hours after eccentric exercise. The present study suggests that Cr supplementation does not decrease oxidative stress and inflammation after eccentric contraction. 相似文献
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Paul R. Ford Juan Luis Delgado Bordonau Daniele Bonanno José Tavares Corne Groenendijk Cristina Fink 《Journal of sports sciences》2020,38(11-12):1269-1278
ABSTRACT Talent identification (TID) and development (TDE) are large fields in professional soccer and in science. However, TID and TDE processes in youth academies have not been assessed in detail. As such, our aim was to survey professional clubs from around the world about their youth academy TID and TDE processes, with 29 clubs responding to the survey. TID and TDE processes changed as a function of player age. TID processes involved finding the best players locally and regionally, but for older players the search widened to nationally and internationally for the needs of the first team. Clubs used a multidisciplinary approach to TID, but more so with older players. Median number of academy players was 80, 100, and 66 players at 8–11 years, 12–16 years, and 17–21 years, respectively. Annual player turnover in the most recent season (selections/de-selections) was 29% across all age groups, with competition from other clubs cited as a limitation to TID. TDE processes involved weekly matches and 3–5 training sessions per week led by experienced, well-qualified coaches, with most clubs providing players with academic education, residency and transportation services. Our findings extend previous research assessing professional soccer youth academy TID and TDE processes by quantifying worldwide practices. 相似文献
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Tânia Brusque Crocetta Regiani Guarnieri Thaís Massetti Talita Dias da Silva Renata Thaís de Almeida Barbosa Jennifer Yohanna Ferreira de Lima Antão 《Measurement in physical education and exercise science》2019,23(2):169-185
The coincidence-anticipation timing (CAT) task assesses one facet of cognitive and motor performance and is used to understand the human visuo-motor system involved in intercepting the moving object. To assess the test–retest reliability and the concurrent validity in the Bridge Games package (Bridge) developed to assess the CAT task, the scores of 224 healthy subjects (M = 52.2, SD = 19.5 years old) were measured using the Bridge and the ‘gold standard’ Bassin Anticipation Timer (Bassin). A mean block of absolute, constant, and variable errors was calculated. Reliability and validity were expressed using intraclass correlation coefficients (ICC2,k), standard error of measurement, minimal detectable change, and Pearson’s correlation. Reliability was good to excellent for all blocks (.73 ≤ ICC ≤ .88), and the validity was good to excellent when compared using Pearson’s correlation coefficient, suggesting that the two tests may have similar properties. Bridge is an alternative to existing clinical tests for the CAT task. 相似文献
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Talita Groenendijk Andrea Krpti Folkert Haanstra 《The International Journal of Art & Design Education》2020,39(1):153-175
A tool for self assessment in secondary art education was developed and tested. The tool includes rubrics for assessing production and reception activities in art education and consists of visual and text rubrics. The criteria in the rubrics are based on the Common European Framework of Reference for Visual Literacy which was developed by The European Network of Visual Literacy (ENViL). The way teachers and students use the rubrics, whether they consider them helpful and to what extent students’ self‐assessments are in line with teacher assessments was studied. It was concluded that teachers work with the rubrics intensively and both students and teachers appreciate its visual form. However, it was found that the agreement between teachers and students about the students’ scores was moderate and needed to improve. The results show that it is untrue that students, or boys in particular, overestimate their own performance in art education. The current study contributes to the development of feasible and valid assessment criteria and instruments in secondary art education. 相似文献
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