1,720,964 research outputs found
Differences between vertical jumps in elite female volleyball players. Reasons for lack of differences
No full textSquat jumps (SJ) and countermovement jumps
(CMJ) are commonly used as tests to assess power output of
lower extremities. Aim of Study. The aim of this article was to
analyze differences between two vertical jumps in order to assess
explosive power in elite female volleyball players and identify
mechanisms responsible for existence of those differences.
Material and Methods. Participants of this study were 14 elite
female volleyball players of the Montenegro U19 national
team (age: 18.42 ± 1.34 years; height: 178.15 ± 4.9 cm; weight:
68.1 ± 5.83 kg; body mass index: 21.34 ± 1.10 kg/m2; body
fat: 18.89 ± 3.70%). Jump height data for a SJ and a CMJ
was obtained using OptoJump device (Optojump, Microgate,
Bolzano, Italy). Results. The results showed that there is no
statistically significant difference (F = 0.093, p < 0.124) between
the heights of the SJ (26.64 ± 2.93 cm) and the CMJ (26.65
± 2.85 cm). Conclusions. The findings suggest that elastic energy
has very little effect on improving CMJ performance. On the
other hand, CMJ training can reduce an ability to effectively
create pre-tension and quickly build stimulation, because
athletes are not forced to do so, as the CMJ reduces a degree of
muscle relaxation and provides more time to create stimulation.
Based on the data, the CMJ may be detrimental to high-intensity
sports performance if performed over a longer time frame
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
Modulation of mitochondrial biogenesis: action of physical activity and phytochemicals
No full textMitochondria are dynamic organelles whose centralrole is synthesis of adenosine-triphosphate (ATP)by
oxidative phosphorylation. They controlseveral cellular activities such as, calcium homeostasis, apoptosis and
productionof reactive oxygen species (ROS). These organelles are the focus of metabolic pathways, and
mitochondrial alteration is indirectly or directly involved in the origin of manysyndromes.Increased
mitochondrial ROS synthesis can perturb the activity of enzymes involved in these paths, affecting both the ATP
synthesis and the metabolic responses. Mitochondrial biogenesis involves an increase in mitochondrial number
and the overall capacity of oxidative phosphorylation, and it is a critical determinant of all tissues function, and
in particular of skeletal muscle. Appropriate nutrition and a constant physical activity,acting on the
mitochondrial biogenesis, are essential and modifiable factors that play a key role in preventing and/or delaying
the mitochondrial degeneration. Exercise-induced mitochondrial remodeling is mediated by upstream signaling
events that converge on downstream transcriptional co-factors, and factors that orchestrate a co-ordinated
nuclear and mitochondrial transcriptional response associated with mitochondrial renovation. Furthermore, the
defensiveconsequence of some natural mixtures on the mechanism involved in mitochondrial role has also been
revealed. Recently a special interest has been focused on phytochemicals, food-derived bioactive compounds and
nutraceuticals that might link high biological activity with good tolerance and low systemic toxicity.
Polyphenols are phytochemicals found ubiquitously in plants and their regular consumption has been associated
with a reduced risk of a number of chronic diseases. Newly, copiousness of evidence shows the promising role
of the polyphenols on mitochondrial structure and function.Thispapersummarized the current findings
concerning the capability of physical activity and selected phytochemicals to act on action of the mitochondria
by the inspiration of their biogenesis
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
Effects of Punica granatum Fruit (a Super Food) Juice on Human Health
No full textAbstract: Background: One of the oldest known edible fruits, the pomegranate (Punica granatum
L.), is now widely consumed worldwide. Its fruits and seed are rich in many bioactive
compounds, such as polyphenols, and the scientific interest in this plant has been constantly
growing in recent years.
Introduction: Pomegranate fruit and its juice have been shown to have health benefits relating to
their antioxidant and anti-inflammatory properties. They are used in alternative medicine as
adaptogens and ergogens, protecting against many neurological, cardiovascular, gastrointestinal,
liver, and skin disorders.
Methods: Given the amount of evidence, this narrative review does not seek to supply a comprehensive
summary of all study findings but rather focuses on human clinical trials related to the
last five years. In this regard, we have performed a check in MEDLINE, and clinical trials presented
in this time are summarized.
Results: Pomegranate consumption as a table fruit or juice, which is high in polyphenols, is thus
recommended in human diet for its health benefits.The consumption of pomegranate fruit symbolizes
a promising therapeutic approach to avert many chronic syndromes.
Conclusion: The findings highlight the need for bigger, more thoroughly planned human clinical
trials to continue research into the potential particular effects of pomegranate fruit, as well as to
determine the ideal dose and duration of pomegranate juice supplementatio
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
- …
