1,720,977 research outputs found
Monitoring of the preseason soccer period in non-professional players
No full textThis study aimed to monitor the training load and to evaluate the fluctuations of straight and change of direction sprinting during a 5-week of the preseason period in 17 non-professional soccer players. Straight 10-m sprint and 15-m zigzag sprint tests were applied six times: at the beginning and on each Friday. Monitoring of the internal training load has been achieved by the Edwards’ TL and the session-RPE, while the external training load was measured by the GPS system. A general prevalence of low-intensity activities within training units and friendly matches were observed, with an increase in high-intensity activities during the last two weeks of the preseason. The performance of both sprint tests decreased during the first three weeks, becoming better at the end of the period, relative to a higher training load scheduled at the beginning of the preseason. Fluctuations in training load emerged along the five weeks with a continuous decrement from the first to the third week, while during the fourth and fifth week a moderate increase was achieved. Moreover, a very large correlation (r=0.71; p<.001) was evident between the Edwards’ TL and the session-RPE, highlighting the usefulness of an easy and valid method to monitor the internal training load. In conclusion, combining the monitoring of training load and the administration of field tests lead to a better distribution of workload, done by the coaching staff, thus avoiding excessive athletes’ overstressing
RSA response to preseason training in semiprofessional soccer players
No full textAbstract This study has investigated the effect of 8 weeks of preseason training on the repeated sprinting ability (RSA) in semiprofessional soccer players (SPSP). An RSA test, consisting of 7 9 30 m sprint with 25 s active rest, was administered to 12 SPSP (age 23 ± 6 years) pre- and post-8 weeks of preseason soccer training. Preseasonal training consisting of aerobic sessions (high-intensity intermittent training) was provided three times a week on alternate days with the strength training sessions (basic and functional strength training) and sprint training drills. Analysis of variance for repeated measures was conducted to assess differences (p.05) in RSA test and fatigue index with time (i.e., pre-post) as within factor. Multivariate analysis of variance, with the seven repeated sprint tests as dependent variables and time (i.e. pre-post) as within factor, was conducted to test differences in sprint performance over the time. The main effect (p.001) was found before (pre-) and after (post-) the preseasonal training in global RSA performance;
conversely, no statistical differences were found between fatigue index values. An overall significant effect was found for the seven sprints performed pre- and post. Univariate
analysis shows that each sprint time was significantly (p.001) lower in the pre- than in the post-RSA tests. This study provides useful information for the coach to understanding the training process of SPSP and to maximize the best physical condition of the whole team
Agility assessment in female futsal and soccer players
No full textAgility is the player's capability to perform rapid whole-body movement with change of velocity or direction in response to a stimulus. The aims of this study were as follows: 1) to assess the reliability of a reactive visual stimuli agility field test (RVS-T); and 2) to evaluate differences in RVS-T and planned (PVS-T) agility performances between female soccer and futsal players. Material and methods: Sixty-six female players belonging to Italian teams of regional level were recruited to the study. The experimental apparatus consisted of four lighted spherical visual stimuli connected to a computer able to randomly generate three different sequences. Differences between RVS-T and PVS-T performances were calculated to evaluate the decision-making time (DMT) of players. Results: The intraclass reliability coeffcient for RVS-T was 0.80. Significant (P<0.05) differences emerged only for RVS-T (futsal, 17.3±0.5 s; soccer, 18.8±1.1 s) and DMT (futsal, 2.6±0.6 s; soccer, 4.1±1.2 s), whereas similar performances between groups resulted for PVS-T (futsal, 14.7±0.6 s; soccer, 14.6±0.6 s). Conclusions: The RVS-T proved to be a reliable tool to evaluate agility in field conditions. Futsal players showed better RVS-T and DMT performances with respect to soccer counterparts, probably due to the higher velocity of actions and faster decision-making of their sport. The lack of difference in PVS-T performances conrms the importance to evaluate agility capabilities of players in both planned and reactive conditions
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Stress related changes during a half marathon in master endurance athletes
No full textThe aim of the present study was to investigate heart rate (HR), salivary cortisol (sC) alpha-amylase (sAA) and rating of perceived exertion (RPE) in relation to competition outcome during a half marathon
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