5 km front crawl in pool and open water swimming: breath-by-breath energy expenditure and kinematic analysis.

PURPOSE: Breath-by-breath energy expenditure during open water swimming has not yet been explored in an ecological environment. This study aimed to investigate and compare energetics and kinematics of 5 km swimming, in both swimming pool and open water conditions. METHODS: Through four independent studies, oxygen uptake ([Formula: see text]2) kinetics, heart rate (HR), blood lactate concentration ([La-]) and glucose level (BGL), metabolic power ([Formula: see text]), energy cost (C) and kinematics were assessed during 5 km front crawl trials in a swimming pool and open water conditions. A total of 38 competitive open water swimmers aged 16-27 years volunteered for this four part investigation: Study A (pool, ten females, 11 males), Study B (pool, four females, six males), Study C (pool case study, one female) and Study D (open water, three females, four males). RESULTS: In the swimming pool, swimmers started with an above average swimming speed (v), losing efficiency along the 5 km, despite apparent homeostasis for [La-], BGL, [Formula: see text]2, [Formula: see text] and C. In open water, swimmers started the 5 km with a below average v, increasing the stroke rate (SR) in the last 1000 m. In open water, [Formula: see text]2 kinetics parameters, HR, [La-], BGL, respiratory exchange ratio and C were affected by the v and SR fluctuations along the 5 km. CONCLUSIONS: Small fluctuations were observed for energetic variables in both conditions, but changes in C were lower in swimming pool than in open water. Coaches should adjust the training plan accordingly to the specificity of open water swimming.

Infarto do miocárdio e mixoma em átrio esquerdo / Myocardial infarction and myxoma in the left atrium / Infarto del Miocardio y Mixoma en Aurícula Izquierda

Os mixomas são os tumores cardíacos primários benignos mais comuns, sendo que a grande maioria localiza-se no átrio esquerdo; 80 por cento têm sua origem no septo interatrial e 5 por cento deles são biatrial. Clinicamente, apresentam-se, quase sempre, com sinais e sintomas de doença valvular mitral ou de eventos tromboembólicos. Este relato ilustra um caso de mixoma em átrio esquerdo, projetando-se através da valva mitral para o ventrículo esquerdo e simulando uma estenose mitral, que evoluiu com acidente vascular cerebral isquêmico (AVCi) e infarto agudo do miocárdio (IAM), como complicações tromboembólicas. O ecocardiograma continua a ser uma ferramenta valiosa no diagnóstico e o tratamento cirúrgico imediato é necessário para evitar desfechos fatais.

Myxomas are the most common benign primary cardiac tumors, the vast majority located in the left atrium and 80 percent originates in the atrial septum and 5 percent of them are biatrial.Usually present, often with signs and symptoms of mitral valve disease or thromboembolic events. This report illustrates a case of myxoma in left atrium protrudind through the mitral valve into the left ventricle, simulating stenotic mitral valve disease, which evolved with ischemic stroke (AIS) and acute myocardial infarction (MI) as thromboembolic events. Echocardiography continues to be a valuable tool in the diagnosis and surgical treatment is immediately necessary to prevent fatal outcomes.

Los mixomas son los tumores cardíacos primarios benignos más comunes, siendo que la gran mayoría se localiza en la aurícula izquierda; el 80% tiene su origen en el septo interauricular y el 5% de ellos son biauriculares. Clínicamente, se presentan, casi siempre, con señales y síntomas de enfermedad valvular mitral o de eventos tromboembólicos. Este relato ilustra un caso de mixoma en aurícula izquierda, proyectándose a través de la válvula mitral hacia el ventrículo izquierdo y simulando una estenosis mitral, que evolucionó con accidente vascular cerebral isquémico (AVCi) e infarto agudo del miocardio (IAM), con complicaciones tromboembólicas. El ecocardiograma continua siendo una herramienta valiosa en el diagnóstico y el tratamiento quirúrgico inmediato es necesario para evitar desenlaces fatales.