17 research outputs found
Body composition and somatotype in professional men's handball according to playing positions
Se realizó un estudio descriptivo transversal en 19 jugadores profesionales
del Club Balonmano Valladolid. Las mediciones antropométricas fueron
realizadas según el protocolo estándar. Se estimaron la masa grasa y ósea, se
calculó el somatotipo y se analizaron las diferencias entre las variables en
función de la posición.
Como resultados, se obtuvo que los pivotes fueron los jugadores más
pesados (con mayor porcentaje de masa grasa); los extremos, los más ligeros y
los laterales, junto con los pivotes, los más altos. No se observaron diferencias
en el IMC en los grupos. En la somatocarta los centrales y laterales se situaron
en la zona central; los extremos y los pivotes en la endomorfa-mesomorfa y los
porteros en la ecto-endomorfa.
Así se evidenció que las variables antropométricas, los datos de
composición corporal y la somatocarta de los deportistas confirman las
características morfológicas básicas de los jugadores para la posición para la
que son más aptosA cross-sectional descriptive study was accomplished in 19 professional players
from Valladolid Handball Club. Anthropometric measurements were performed
according to standard protocol. Body fat and bone mass were estimated, and
the somatotype was calculated.
As results, the line players were significantly the heaviest players; the wings
were lightest and the backs, with the line players, the tallest. Nevertheless, no
significant differences in BMI were observed. Regarding the body composition,
the line players showed the highest values of fat-mass. No differences in BMI
were observed in the groups. With respect to the somatochart, the center backs
and backs were in the central area; wings and line players showed an
endomorph-mesomorph development, and goalkeepers were in the ectoendomorph
area.
As conclusions, anthropometric variables, body composition data and the
somatochart of the athletes evaluated confirm the basic morphological
characteristics of the players for the position for which they are best suite
Self-testing through EPR-steering
The verification of quantum devices is an important aspect of quantum information, especially with the emergence of more advanced experimental implementations of quantum computation and secure communication. Within this, the theory of device-independent robust self-testing via Bell tests has reached a level of maturity now that many quantum states and measurements can be verified without direct access to the quantum systems: interaction with the devices is solely classical. However, the requirements for this robust level of verification are daunting and require high levels of experimental accuracy. In this paper we discuss the possibility of self-testing where we only have direct access to one part of the quantum device. This motivates the study of self-testing via EPR-steering, an intermediate form of entanglement verification between full state tomography and Bell tests. Quantum non-locality implies EPR-steering so results in the former can apply in the latter, but we ask what advantages may be gleaned from the latter over the former given that one can do partial state tomography? We show that in the case of self-testing a maximally entangled two-qubit state, or ebit, EPR-steering allows for simpler analysis and better error tolerance than in the case of full device-independence. On the other hand, this improvement is only a constant improvement and (up to constants) is the best one can hope for. Finally, we indicate that the main advantage in self-testing based on EPR-steering could be in the case of self-testing multi-partite quantum states and measurements. For example, it may be easier to establish a tensor product structure for a particular party’s Hilbert space even if we do not have access to their part of the global quantum system
Different displacement of bioimpedance vector due to Ag/AgCl electrode effect
Background/Objectives:Bioelectrical impedance vector analysis (BIVA) is increasingly used in clinical research to assess soft tissue hydration. It is known that physical characteristics of electrodes, such as low intrinsic impedance, low electrode/skin contact impedance and type of gel, affect the reliability of noninvasive bioimpedance assessments. The aim of this study was to determine the effect of intrinsic impedance of electrode on the bioimpedance vector displacement in RXc graph.Subjects/Methods:The intrinsic impedance is measured in nine pregelled disposable Ag/AgCl electrodes usually used for bioimpedance measures. The BIVA method is performed on 35 healthy volunteers using a 50 kHz phase-sensitive bioimpedance analyzer (BIA 101 Anniversary) with the lowest intrinsic impedance electrode and highest. The individual bioimpedance vector is plotted on the bivariate normal interval of reference population. The differences in the mean bioimpedance vectors obtained with each electrode are plotted, with their 95% confidence ellipses, on the dRXc graph. The paired one-sample Hotelling's T 2 -test is used to compare the differences of the mean bioimpedance vectors.Results:We found large variability in intrinsic resistance (11-665 Ω) and reactance (0.25-2.5 Ω) values of the electrodes analyzed and significant displacement (P<0.05) of bioimpedance vector positions in healthy adults according to the paired one-sample Hotelling's T 2 -test.Conclusions:A robust study of all physical characteristics of commercial Ag/AgCl electrodes is necessary to reach consensus on pregelled Ag/AgCl electrodes valid for bioimpedance measurement. This information will enable BIVA users to avoid systemic errors when performing BIVA assessments, specifically when these measurements are used for clinical interpretations