For measurement of poststenotic jet velocities with magnetic resonance (MR) imaging, the authors reduced the echo time (TE) of the field even-echo rephasing (FEER) velocity mapping sequence from 14.0 to 3.6 msec, so minimizing the problem of MR signal loss from turbulent fluid. In vitro use of rotating disk and stenotic flow phantoms confirmed that the 3.6-msec TE sequence enables accurate measurement of jet velocities of up to 6.0 m/sec (r = .996). Peak jet velocity measurements were made with MR imaging in 36 patients with stenosis of native heart valves (n = 9), conduits (n = 19), or Fontan connections (n = 2) or with aortic coarctation (n = 6). Peak velocity measurements made with MR imaging agreed well with measurements made with Doppler ultrasound (US), which were available in 18 cases (standard deviation = 0.2 m/sec). Velocity mapping with fast-echo MR imaging is likely to have considerable importance as a noninvasive means of locating and evaluating stenoses, particularly at sites inaccessible to US, but care must be taken to prevent errors caused by malalignment, signal loss, phase wrap, or partial-volume effects.
The objective of this study was to analyse the effectiveness of finishing actions in men’s and women’s professional padel. To do this, the category, the type of finishing actions, the type of shot and the number of shots in 5513 points from five World Padel Tour tournaments were analysed. The results showed that men made more winners and fewer errors than women ( p < 0.001); with smashes usually being the most frequently used shots to make winners, also highlighting the forehand off the wall smash in women's padel. The back wall shots and forehand or backhand shots without a wall appear as the most frequent errors in these finishing actions. Also, while men tend to make more errors with forehand volleys, women hit more winners with this shot. Men and women padel players make more errors (CSR = 6.7; CSR = 5.5) and fewer winners (CSR = −6.7; CSR = −5.5) in the first five shots of each point. However, they make fewer errors and more winning shots as the number of shots per point increases. These findings are highly relevant, since the style of play differs according to the gender of the players.
NMR imaging with velocity mapping is the most effective noninvasive method of assessing obstruction in ventriculopulmonary conduits and can obviate the need for invasive investigation before an interventional procedure is performed.
El objetivo del presente trabajo fue analizar las diferencias existentes entre pádel profesional masculino y femenino en parámetros de volumen de juego e intensidad, así como la influencia de la ronda de juego y el número de set. Se analizaron mediante observación sistemática 5.513 puntos de 38 partidos correspondientes a cinco torneos World Padel Tour de las temporadas 2019 y 2020. Los resultados obtenidos muestran un mayor tiempo de juego (p<0,001), número de globos (p<0,001) y menos intensidad en el juego en pádel femenino (p<0,001), independientemente del set o ronda de juego. Además, el tercer set es el que presenta un mayor tiempo de juego por punto, mayor número de golpeos, más globos y menor intensidad de juego. Finalmente, la ronda de cuartos de final es la que mayor número de golpeos por punto existe, siendo la final donde mayor número de globos y tiempos de juego se producen.
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