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EFFECT OF THE COLLECTING METHOD ON SESSION-RPE IN YOUTH SOCCER PLAYERS
No full textIntroduction
The assessment of the Rate of Perceived Exertion (RPE) is widespread in soccer to calculate the session-RPE that is a valid method to
assess training load (TL) (Foster et al., 2001). Instructions on the RPE assessment indicated that the rating has to be collected confidentially
(CONF) after the training1, however sometimes fitness coaches use a non-confidential (NCONF) modality that may be biased by the influence
of other players. The aim of this study was to examine the effect of NCONF modality on the RPE rating.
Methods
Twenty young soccer players (age 16±0.1 years, height 176±8 cm, body mass 67±13 kg) participated in a crossover design study. After
presentation of the Borg CR-100 scale, players were familiarized with the scale for 3 weeks. A memory and exercise (Yo-Yo Intermittent
Recovery Level 1) procedures were used to anchor the scale. Players were randomly divided in 2 conditions: CONF and NCONF. Internal TL
was assessed with heart rate based methods: Edward’s TL and Banister TRIMP. External TL was monitored in 8 players with GPS as total
distance (TD) and high intensity distance (HI>14.4km/h). After each session the players were interviewed (CONF) or wrote their RPE value
on a blackboard attached in the team dressing room (NCONF). Mean differences (90%CI) in RPE, internal and external TL between the 2
conditions were analyzed. Coefficients of variation (CV) were calculated for RPE and Bland & Altman plot with limits of agreement (LOA)
were used two check interchangeability between the two assessments.
Results
No differences were found for Edward’s TL and Bannister TRIMP in the 2 conditions (mean difference, 90%CI: 3.0, -1.7 to 7.7 AU and 1.9, -
1.1 to 4.8 AU). No differences were found for TD and HIR in the 2 conditions (mean difference, 90%CI: -93, -269 to 83m and -66, -157 to
25m). RPE were 31.3±7.3 and 30.1±4.4 AU with no difference between the 2 conditions (-0.4, -2.2 to 1.5 AU). CV were 0.23 (90%CI 0.19 to
0.32) and 0.14 (90%CL 0.11 to 0.20) for CONF and NCONF, respectively. Bland & Altman plot showed bias -0.35 (95%CI: -2.6 to 1.9) and
LOA of -9.7 to 9.0 AU.
Discussion
Two training sessions with the same internal and external TLs were performed. RPE assessed in 2 different modalities showed similar
values. However, the variability in NCONF condition was lower than in CONF, Bland Altman plot showed that some players provide different
rating in the 2 conditions. The first RPE written in the NCONF modality may have influenced subsequent players in their rating. Coaches
should use a confidential modality and follow instructions in the assessment of RPE.
References
Foster C et al. J. Strength Cond. Res. 15:109–115,200
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
Are the Yo-Yo intermittent recovery test levels 1 and 2 both useful? Reliability, responsiveness and interchangeability in young soccer players
No full text© 2014, © 2014 Taylor & Francis. Abstract: The aim of this study was to compare the reliability, internal responsiveness and interchangeability of the Yo-Yo intermittent recovery test level 1 (YY1), level 2 (YY2) and submaximal YY1 (YY1-sub). Twenty-four young soccer players (age 17 ± 1 years; height 177 ± 7 cm; body mass 68 ± 6 kg) completed each test five times within pre- and in-season; distances covered and heart rates (HRs) were measured. Reliability was expressed as typical error of measurement (TEM) and intraclass correlation coefficient (ICC). Internal responsiveness was determined as effect size (ES) and signal-to-noise ratio (ESTEM). Interchangeability was determined with correlation between training-induced changes. The TEM and ICC for distances in the YY1 and YY2 and for HR in YY1-sub were 7.3% and 0.78, 7.1% and 0.93 and 2.2% and 0.78, respectively. The ESs and ESTEMs were 0.9 and 1.9 for YY1, 0.4 and 1.2 for YY2 and −0.3 and −0.3 for YY1-sub. Correlations between YY1 vs. YY2 and YY1-sub were 0.56 to 0.84 and −0.36 to −0.81, respectively. Correlations between change scores in YY1 vs. YY2 were 0.29 and −0.21 vs. YY1-sub. Peak HR was higher in YY1 vs. YY2. The YY1 and YY2 showed similar reliability; however, they were not interchangeable. The YY1 was more responsive to training compared to YY2 and YY1-sub
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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