Validity and reliability of a 6-a-side small-sided game as an indicator of match-related physical performance in elite youth Brazilian soccer players

ABSTRACT

The aims of this study were: (i) to compare the external and internal load during a 6-a-side small-sided game (6v6-SSG) according to age-group; (ii) to relate these parameters between the 6v6-SSG and official matches; and (iii) to test the reliability of the 6v6-SSG. A total of 51 Brazilian youth soccer players participated in this study (U11 [n = 16]; U13 [n = 10]; U15 [n = 9]; U17 [n = 8]; U20 [n = 8]). Three experiments were conducted. Experiment A: fifty-one U11 to U20 players were submitted to 6v6-SSGs (n = 10 games; two for each age-group). Experiment B: thirty-two players were randomized to also play official matches (n = 6 matches). Experiment C: thirty-five youth players played the 6v6-SSG twice for test and retest reliability analysis. External load was obtained using Global Positioning Systems and the internal load parameter was calculated through mean heart rate. Statistical approaches showed progressive increases in all parameters according to categories (U11< U13< U15< U17< U20; p < 0.05; ES = 0.42?23.68). Even controlling for chronological age, all parameters showed likely to almost certain correlations between 6v6-SSG and official matches (r = 0.25?0.92). Collectively, the proposed protocol indicates good reliability (CV% = 2.0?12.6; TE% = 2.3?2.7%; ICC = 0.78?0.90). This research suggests that the 6v6-SSG is an alternative tool to indicate match-related physical performance in youth soccer players.     

Effects of replica running shoes upon external forces and muscle activity during running

Abstract

Twelve participants ran (9 km · h^?1) to test two types of running shoes: replica and original shoes. Ground reaction force, plantar pressure and electromyographic activity were recorded. The shoes were tested randomly and on different days. Comparisons between the two experimental conditions were made by analysis of variance (ANOVA) test (P ≤ 0.05). The time to first peak, loading rate of the first peak and impulse of the first 75 ms of stance were significantly different between the shoes (P ≤ 0.05), revealing an increase of impact forces for the replica shoes. The peak plantar pressure values were significantly higher (P ≤ 0.05) when wearing replica shoes. During running, the contact area was significantly smaller (P ≤ 0.05) for the replica shoe. The electromyographic activity of the analysed muscles did not show changes between the two shoes in running. These findings suggest that the use of replica running shoes can increase the external load applied to the human body, but may not change the muscle activity pattern during locomotion. This new mechanical situation may increase the risk of injuries in these movements.     

Archival science facing the information society

It is only a few decades ago that archivists befan to redefine theirdiscipline in terms of a science. This redefinition of archives and records management was the consequence of a growing need for an adequate expression referring to a comprehensive new body of knowledge on records and archives. Consensus on how to adequately define archival sciencehas not been achieved yet, however. As information society evolves,records and archives are changing in nature and status. It is anemerging discipline that has to be defined, which is still bearsthe impress of the mindset and practices of the industrial society.Bruno Delmas shows the archivist some clues to find a way out of thisambiguity and keep communicating human heritage to unknown generations.     

Government Grants to Private Cultural Institutions–The Effects of a Change in the Italian Legislation

In Italy, the Regular Grant is the most important subsidy to private cultural institutions. Since 1996, law 534/96 has regulated its provision. This law greatly improves on the previous legislation, as it redefines the prerequisites to become a recipient and specifies performance indicators to which the size of the grant must be tied. This paper examines the effects of the introduction of the new law, the characteristics of the government choice process and the redistribution profile of these grants using a variety of estimating techniques on official data gathered for the purpose.     

Evaluation of education in the European Union: Policy and methodology

Given the new European institutional environment for education and training, policy and methodology for evaluation have become closely interwoven and stakes have been raised. This emerging situation calls for a robust reappraisal of existing comparative evaluation data and systems in the light of the perceived needs of European countries and of the specificity of European policies. Educational evaluation in Europe is not meant to compare results in the usual sense of the word but rather to help set global policy objectives and provide data to see if those are reached within national contexts. Is it really possible to do this without developing a 'unified' European understanding and methodology of evaluation? To what extent can existing national and international data be used for the purpose, knowing that in some instances they measure aspects of education which are either not relevant for or are contrary to the educational objectives of the construction of the Union? What are the alternatives? What are the consequences for education and for assessment research in Europe?     

The National Student Survey: validation in Portuguese medical students

The UK National Student Survey (NSS) is a sound and widely used instrument for assessing students’ academic experiences. We aimed to translate the NSS for Portuguese students and to validate the instrument in a sample of medical undergraduates. The research team translated and adapted the NSS for Portuguese students (NSS-P). The survey was administered on an online platform to 1,256 final-year students at eight Portuguese medical schools. A total of 329 medical students (69.9% female) replied to the NSS-P, a response rate of 26.2%. Confirmatory factor analysis showed that the original six-factor structure had an adequate fit to the data. Adequate internal consistency was observed for all the subscales. Medium to large correlations were found among all the subscale scores and between the subscale scores and the students’ overall satisfaction. Multiple regression showed that the scores on the Teaching, Organization and Management and Personal Development subscales significantly predicted the students’ overall satisfaction. Approximately 64% of the students reported being satisfied with the quality of their courses. Significant differences among the medical schools in their NSS-P scores were found. The NSS-P is a valid and reliable measure for assessing medical students’ perceptions of academic quality.