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Repetitive task evaluation by means of electromyographic an kinematics signals acquired from upper limbs
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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
Cancellation of surface action potential amplitude in motor units of the vastus medialis muscle
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Reliability of surface electromyography in estimating muscle fiber conduction velocity: A systematic review
No full textThe purpose of this study was to review the literature (1) to determine whether surface electromyography (sEMG) is a reliable tool for estimating muscle fiber conduction velocity (CV) and (2) to identify the experimental conditions that allow highly reliable CV estimation. A literature search was performed using PubMed and Web of Science databases using the terms "reproducibility", "reliability", "agreement", "surface electromyography" and "conduction velocity". Reporting quality was assessed using the "Guidelines for the Reporting of Reliability and Agreement Studies" checklist. Seventeen papers met the eligibility criteria. Test-retest, intrasession and intersession reliability were investigated in four, three and 12 studies, respectively. Although none of the studies satisfied all the relevant quality criteria, in fifteen studies, it was possible to locate an appropriate description for up to five items of the checklist. High reliability (intraclass correlation coefficient >0.69) was reported in eight studies and was, in general, associated with using the initial or mean CV value, using several electrodes (3 to 8), ensuring appropriate electrode positioning, and evaluating muscles with fibers that run parallel to the skin. Consequently, sEMG is suitable for use when investigating CV across multiple sessions in sport science, rehabilitation, physiological and clinical studies
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
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