1,721,252 research outputs found
Falcioni L, Gallotta MC, Baldari C, Cardinali L, Campanella M, Ferrari D, Guidetti L, Meucci M. Influence of training status on cardiac and vascular functioning in young recreational and competitive male rowers. Frontiers in Pediatrics, section Pediatric Cardiology
No full textIntroduction: The aim of the study was to investigate the influence of training
status on cardiovascular function in young male recreational and competitive
rowers.
Methods: Ejection duration in percentage to the heart rate period (ED%),
subendocardial viability ratio (SEVR), augmentation index at 75 bpm (AIx75) and
carotid to femoral pulse wave velocity (cf-PWV) of competitive rowers (CR) (age
17.6 ± 4.1 years), recreational rowers (RR) (age 16.7 ± 2.70 years) and athletes
practicing other recreational sports (ORS) (age 15.3 ± 1.4 years) were assessed.
Results: ED% was lower in CR compared to ORS (31.9 ± 3.9% vs. 38.4 ± 4.8%; p =
0.026) and cf-PWV was higher in CR compared to ORS (5.5 ± 1.0 m/s vs. 4.7 ±
0.5 m/s; p = 0.032). SEVR was higher in CR compared to RR and ORS (165.8 ±
33.7% vs. 127.4 ± 30.4% and 128.3 ± 27.8%; p = 0.022) and AIx75 was lower in CR
compared to RR and ORS (−15.7 ± 8.6% vs. 1.2 ± 9.9% and 1.5 ± 9.1; p = 0.001).
Discussion: Healthy, young competitive male rowers reported higher myocardial
performance and better cardiovascular health than recreational athletes.
Interpretations of cf-PWV in competitive rowers should be performed alongside
other cardiovascular indicators
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
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
Physical Activity and Training Prescription
No full textObesity is a widespread public health problem for health. A better understanding of exercise prescription can be helpful for the development of effective interventions for the treatment of excessive body weight and the prevention of health-related diseases in adults. Physical activity in terms of structured exercise is associated with prevention of weight gain, long-term weight loss, and health benefits, if prescribed in an adequate duration and intensity. Moderately vigorous physical activity of 150–250 min a week with an energy equivalent of about 1,200–2,000 kcal per week may be enough to prevent a weight gain greater than 3 % in most adults. However, it is clear that physical activity combined with dietary energy restrictions is more effective to prevent weight gain and promote weight loss in overweight and obese adults. Given that adults in excess of body weight are more prone to drop out from a physical activity program in comparison with their normal-weight peers, interventions that may lead them to feel better and improve adherence, such as self-paced protocols, should be taken into consideration by health professionals. © Springer International Publishing Switzerland 2015
Light-induced atom desorption
No full textIn the present paper we report experimental evidence of a new effect, observed for the first time by Gozzini et al. on sodium vapour, in which an important rubidium vapour density increase (larger than one order of magnitude) is observed when silane-coated cells are shined by non-resonant and weak light. The effect is due to non-thermal light-induced atom desorption. A preliminary analysis of its dependence on the light power density and on the wavelength has been carried out. © 1994 IOP Publishing Ltd
Oxygen uptake efficiency slope in healthy normal weight young males: an applicable framework for calculation and interpretation
No full textBackground: The oxygen uptake efficiency slope (OUES) is considered a reliable indicator of cardiorespiratory fitness (CRF) in young and clinical populations who cannot achieve maximal effort during a graded exercise test. However, OUES accuracy depends on the data points used for its calculation and it is still not clear if the submaximal OUES can accurately assess CRF in healthy young males.
Objective. We investigated the association between peak oxygen uptake (VO2peak) and peak and submaximal OUES, and the agreement between submaximal OUES and peak OUES in male adolescents and young adults.
Methods. Fifty normal weight healthy participants (age 14-22 years, VO2peak 43.8 ± 7.3 mL·min-1·kg1) performed a graded exercise test on a cycle ergometer, pulmonary gas exchange was assessed using breath-by-breath analysis. VO2peak, and oxygen consumption (VO2) at the aerobic (AerT) and at the anaerobic threshold (AnT) were determined as the 30-second average of the VO2 values. Peak OUES (up to peak) and submaximal OUES (up to AerT and up to AnT) were calculated from the logarithmic relation between VO2 and pulmonary ventilation.
Results. VO2peak showed higher correlations with peak OUES (r=0.80-0.88) than with the two submaximal OUES (r=0.32-0.81). Peak OUES showed higher agreement with OUES up to AnT (r=0.89-0.93; Typical percentage error 5.9%; Intraclass correlation coefficient = 0.89-0.93) than with OUES up to AerT (r=0.39-0.56; Typical percentage error 15.0%; Intraclass correlation coefficient = 0.38-0.56).
Conclusions. The peak OUES is the best indicator of aerobic fitness in healthy males followed by the OUES up to AnT. The OUES up to AnT is a valid alternative to peak OUES
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