1,720,959 research outputs found
Cardiovascular Screening In Young Italian Athletes: A Comparison Between Different Exercise Test For Arrhythmia Detection.
No full textAbstract: In 1982 a pre-participation screening of athletes was launched in Italy. For younger athletes (<35y.o.). The protocol included a resting 12-lead ECG together with two more ECG recorded during the recovery phase of a submaximal test (Harvard step test, HST). More recently
(2006), Veneto Region established the ECG monitoring throughout the Harvard step test. In our Sports Medicine Unit since 1998 we independently decided to use a maximal treadmill test with ECG monitoring for the same screening puposes.
PURPOSE: Aim of this study was to compare the ability of three different exercise test modalities to detect arrhythmias, and whether they were associated with structural heart abnormalities.
METHODS: 1500 athletes, mean age 14.7±0.6 (range 8-15yo) were evaluated (500 each) in three Sports Medicine Centers differentiating one from each other by three different test modalities: HST without ECG monitoring (HST), HST with ECG monitoring (HSTM), and maximal treadmill test with ECG monitoring (MTT). Before the exercise test, each athlete underwent a history and clinical evaluation, and a resting ECG. Athletes underwent additional ecocardiography and 24-hour ECG monitoring when required.
RESULTS: the maximal heart rate achieved was 74,7% (HST), 85,6% (HSTM) and 92,1% (MTT)
of the maximal predicted. Arrhythmias (VEB and/or SVEB) were observed in 1%, 2,6%, and 8.6% of the subjects for HST, HSTM, and MTT, respectively. Considering only the monitored exercise phase, arrhythmias were recorded in 0,6% of HSTM subjects (23,1% of total arrhythmias) and in
2,4% of MTT subjects (27,9%). The positive predictive value of generic arrhythmias recorded during the MTT for any echocardiographic structural heart abnormality was 0,35, while was 0,6 when both VEB and SVEB were present.
CONCLUSION: Exercise monitoring increased the sensitivity in detecting arrhythmias and structural heart defects respect to the non monitored exercise test. The MTT induced a greater number of arrhythmias, which were associated with cardiac abnormalities (mainly mitral valve prolapse, PFO, aortic and mitral regurgitation) in 35-60% of subjects, depending on the type of arrhythmias. In athletes screening, ECG monitoring during exercise should be considered to
improve the sensitivity of the exercise test
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Continuous glucose monitoring reveals delayed nocturnal hypoglycemia after intermittent high-intensity exercise in nontrained patients with type 1 Diabetes
No full textObjective: Exercise is a cornerstone of diabetes therapy in type 1 diabetes mellitus (DMT1) patients. The type of exercise is important in determining the propensity to hypoglycemia. We assessed, by continuous glucose monitoring (CGM), the glucose profiles during and in the following 20 h after a session of two different types of exercise.
Research Design and Methods: Eight male volunteers with well-controlled DMT1 were studied. They underwent 30 min of both intermittent high-intensity exercise (IHE) and moderate-intensity exercise (MOD) in random order. Expired air was recorded during exercise, while metabolic and hormonal determinations were performed before and for 120 min after exercises. The CGM system and activity monitor were applied for the subsequent 20 h.
Results: Blood glucose level declined during both type of exercise. At 150 min following the start of exercise, plasma glucose content was slightly higher after IHE. No changes were observed in plasma insulin concentration. A significant increase of norepinephrine concentration was noticed during IHE. Between midnight and 6:00 a.m. the glucose levels were significantly lower after IHE than those observed after MOD (area under the curve, 23.3 ± 3 vs. 16 ± 3 mg/dL/420 min [P = 0.04]; mean glycemia at 3 a.m., 225 ± 31 vs. 147 ± 17 mg/dL [P < 0.05]). The number of hypoglycemic episodes after IHE was higher than that observed after MOD (seven vs. two [P < 0.05]).
Conclusions: We demonstrate that (1) CGM is a useful approach in DMT1 patients who undergo an exercise program and (2) IHE is associated with delayed nocturnal hypoglycemia
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
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