111 research outputs found
Facilitating Positive Youth Development through Competitive Youth Sport: Opportunities and Strategies
info:eu-repo/semantics/publishedVersio
Learned Helplessness: A Case Study of a Middle School Student
This is the publisher's version, also found at http://ehis.ebscohost.com/ehost/detail?vid=4&sid=18c07398-402e-4572-aa35-4d1deeeff1be%40sessionmgr15&hid=2&bdata=JnNpdGU9ZWhvc3QtbGl2ZQ%3d%3d#db=s3h&AN=2075200
O PAPEL DO TREINADOR NO DESENVOLVIMENTO POSITIVO DOS JOVENS ATRAVĂS DO DESPORTO DE COMPETIĂĂO: NECESSIDADES, DESAFIOS E RECOMENDAĂĂES
info:eu-repo/semantics/publishedVersio
Coaching effectiveness within competitive youth football: youth football coachesâ and athletesâ perceptions and practices
Competitive youth sport can provide solid grounds for
positive youth development (PYD). However, there is need to
understand if coaches are facilitating these types of outcomes.
The purpose of this study was to analyze how competitive
youth sport is used to facilitate PYD. The participants in this
study were four youth football coaches and 19 adolescent
athletes from competitive leagues at north of Portugal.
Data were collected through semi-structured interviews,
field notes and nonparticipant observations. The majority
of the coaches communicated appropriately and facilitated
positive interactions with youth athletes. Nevertheless, the
participants did not implement an explicit approach towards
the development of confidence, character, connection and
competence (i.e., 4 Câs) which has been linked to less PYD
outcomes. Performance outcomes in certain moments
superseded PYD ones. Moving forward, coaches need to
comprehend how they can use their interpersonal knowledge
to integrate the 4 Câs within competitive youth sport.info:eu-repo/semantics/publishedVersio
Heart of Hypertension Project: Development of a Community-Based Prevention Program for Young African American Men
Background: Early-onset hypertension (HTN) is a major contributor to shortened life expectancy of African American men. Lifestyle changes are known to reduce blood pressure (BP); however, interventions tailored for young African American men have not been developed.Objectives: With a community partner, we developed and assessed a HTN education and lifestyle intervention for young African American men.Methods: A preliminary plan was presented to experts and to 18- to 22-year-old African American men, and revised based on their feedback. The revised plan (health screening and 6-week intervention) was tested with the focal group.Lessons Learned: Participants were enthusiastic about the program and suggested improvements included increasing individualized guidance, building on relationships, and defining the Heart of Hypertension community.Conclusions: The Heart of Hypertension Project holds promise for HTN prevention among young African American men. The next steps are to incorporate feedback from participants into the approach and evaluate the effectiveness of the intervention on lifestyle change and BP in young African American men with pre-HTN
Magnetic Field Dependence of Macroscopic Quantum Tunneling and Coherence of Ferromagnetic Particle
We calculate the quantum tunneling rate of a ferromagnetic particle of diameter in a magnetic field of arbitrary angle. We consider the
magnetocrystalline anisotropy with the biaxial symmetry and that with the
tetragonal symmetry. Using the spin-coherent-state path integral, we obtain
approximate analytic formulas of the tunneling rates in the small -limit for the magnetic field normal to the easy axis (), for the field opposite to the initial easy axis (),
and for the field at an angle between these two orientations (). In addition, we obtain numerically the tunneling rates for
the biaxial symmetry in the full range of the angle of the magnetic
field (), for the values of \epsilon =0.01 and
0.001.Comment: 25 pages of text (RevTex) and 4 figures (PostScript files), to be
published in Phys. Rev.
Limiting esophageal temperature in radiofrequency ablation of left atrial tachyarrhythmias results in low incidence of thermal esophageal lesions
<p>Abstract</p> <p>Background</p> <p>Atrio-esophageal fistula formation following radiofrequency ablation of left atrial tachyarrhythmias is a rare but devastating complication. Esophageal injuries are believed to be precursors of fistula formation and reported to occur in up to 47% of patients. This study investigates the incidence of esophageal lesions when real time esophageal temperature monitoring and temperature limitation is used.</p> <p>Methods</p> <p>184 consecutive patients underwent open irrigated radiofrequency ablation of left atrial tachyarrhythmias. An esophageal temperature probe consisting of three independent thermocouples was used for temperature monitoring. A temperature limit of 40°C was defined to interrupt energy delivery. All patients underwent esophageal endoscopy the next day.</p> <p>Results</p> <p>Endoscopy revealed ulcer formation in 3/184 patients (1.6%). No patient developed atrio-esophageal fistula. Patient and disease characteristics had no influence on ulcer formation. The temperature threshold of 40°C was reached in 157/184 patients. A temperature overshoot after cessation of energy delivery was observed frequently. The mean maximal temperature was 40.8°C. Using a multiple regression analysis creating a box lesion that implies superior- and inferior lines at the posterior wall connecting the right and left encircling was an independent predictor of temperature. Six month follow-up showed an overall success rate of 78% documented as sinus rhythm in seven-day holter ECG.</p> <p>Conclusion</p> <p>Limitation of esophageal temperature to 40°C is associated with the lowest incidence of esophageal lesion formation published so far. This approach may contribute to increase the safety profile of radiofrequency ablation in the left atrium.</p
Genetic Diversity of the Cestode Echinococcus multilocularis in Red Foxes at a Continental Scale in Europe
Echinococcus multilocularis is a tapeworm of the red fox, which represents a considerable health threat to respectively infected humans. Main endemic areas are located in China, Siberia, and central Europe. Alarmed by an emerging or reemerging situation in Europe, the question of how the parasite gets spatially and temporally spread and transmitted becomes essential to prepare appropriate control programs. The question was tackled by using genetic data on a large sample size of E. multilocularis adult stage tapeworms, combined with geographical site location data input. The historically documented endemic area, represented by the northern Alpine arch, was shown to harbour the highest genetic richness and diversity, as compared to surrounding areas in northern and eastern Europe. The spatial and temporal spread of different E. multilocularis genotypes in Europe seems to be ruled by a founder event, linked to exportation of parasites from the central core to newly identified (western and eastern) areas or subregions, where these parasites could subsequently disseminate under geographical separation from the original foci
A worldwide survey on incidence, management and prognosis of oesophageal fistula formation following atrial fibrillation catheter ablation: The POTTER-AF study.
AIMS
Oesophageal fistula represents a rare but dreadful complication of atrial fibrillation catheter ablation. Data on its incidence, management and outcome are sparse.
METHODS AND RESULTS
This international multicenter registry investigates the characteristics of oesophageal fistulae after treatment of atrial fibrillation by catheter ablation. A total of 553,729 catheter ablation procedures (radiofrequency: 62.9%, cryoballoon: 36.2%, other modalities: 0.9%) were performed at 214 centers in 35 countries. In 78 centers 138 patients (0.025%, radiofrequency: 0.038%, cryoballoon: 0.0015% (p<0.0001)) were diagnosed with an oesophageal fistula. Periprocedural data were available for 118 patients (85.5%). Following catheter ablation, the median time to symptoms and the median time to diagnosis were 18 (7.75, 25; range: 0-60) days and 21 (15, 29.5; range: 2-63) days, respectively. The median time from symptom onset to oesophageal fistula diagnosis was 3 (1, 9; range: 0-42) days. The most common initial symptom was fever (59.3%). The diagnosis was established by chest computed tomography in 80.2% of patients. Oesophageal surgery was performed in 47.4% and direct endoscopic treatment in 19.8%, and conservative treatment in 32.8% of patients. The overall mortality was 65.8%. Mortality following surgical (51.9%) or endoscopic treatment (56.5%) was significantly lower as compared to conservative management (89.5%) (odds ratio 7.463 (2.414, 23.072) p<0.001).
CONCLUSIONS
Oesophageal fistula after catheter ablation of atrial fibrillation is rare and occurs mostly with the use of radiofrequency energy rather than cryoenergy. Mortality without surgical or endoscopic intervention is exceedingly high
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