A PILOT STUDY ON HOW WORLD-CLASS MALE VOLLEYBALL PLAYERS LAND AFTER A SPIKE

INTRODUCTION: When attempting to improve the spiking ability of players, coaches should be concerned with preventing leg injuries, which may be induced by landing after spiking. Therefore, the purpose of this study was to analyze how world-class male volleyball players land after a spike during official games and obtain insights into a safer landing

A BIOMECHANICAL ANALYSIS OF PIPE SPIKE MOTION FOR ELITE MALE VOLLEYBALL PLAYERS IN OFFICIAL GAMES

The purpose of this study was to three-dimensionally analyze and compare the pipe spike motion for elite volleyball players and obtain insights into its techniques. The front and pipe spike motions of players of Japan, Brazil and Bulgaria were videotaped during four official games of the Volleyball World Cup 2007 with two high-speed video cameras to obtain three-dimensional coordinates of the body segments. The angles and angular velocities of the upper torso, shoulders, right elbow and wrist were three-dimensionally calculated. The results were summarized as follows. The CG horizontal velocity for the pipe spike was greater than that for the front spike for all players. In the pipe spike, all players shortened the time from the takeoff to the impact and the backswing time. After the takeoff, GG acutely twisted the trunk backward and maintained that position before twisting forward towards the impact in the pipe spike. GG had larger velocity of the left shoulder from the takeoff to the impact for the pipe spike than for the front spike

BIOMECHANICAL ANALYSIS OF THE SPIKE MOTION FOR WORLD-CLASS MALE VOLLEYBAL PLAYERS

The front spike is the most frequently used technique to obtain a point in volleyball, but there is little specific information on the spike motion for elite players during games. That warrants understanding of the mechanism of this motion and an evidencebased coaching. The purpose of this study was to analyze and compare the spike motions of world-class male volleyball players who participated in the Men’s World Championship 2006

Comparison of ultrasonographic findings in cats with and without azotaemia

US findings in 238 cats with (serum creatinine >180 μmol/l) and 270 cats without azotaemia were compared in a retrospective case-control study. Cats with pre-renal azotaemia or urethral obstruction were excluded. Data extracted from the medical records included age, body weight and body condition score (BCS). Quantitative and subjective US findings were extracted from archived ultrasound images and contemporaneous reports

Quantum correlations and synchronization measures

The phenomenon of spontaneous synchronization is universal and only recently advances have been made in the quantum domain. Being synchronization a kind of temporal correlation among systems, it is interesting to understand its connection with other measures of quantum correlations. We review here what is known in the field, putting emphasis on measures and indicators of synchronization which have been proposed in the literature, and comparing their validity for different dynamical systems, highlighting when they give similar insights and when they seem to fail.Comment: book chapter, 18 pages, 7 figures, Fanchini F., Soares Pinto D., Adesso G. (eds) Lectures on General Quantum Correlations and their Applications. Quantum Science and Technology. Springer (2017

Escape rate and Hausdorff measure for entire functions

The escaping set of an entire function is the set of points that tend to infinity under iteration. We consider subsets of the escaping set defined in terms of escape rates and obtain upper and lower bounds for the Hausdorff measure of these sets with respect to certain gauge functions.Comment: 24 pages; some errors corrected, proof of Theorem 2 shortene

Visual parameter optimisation for biomedical image processing

Background: Biomedical image processing methods require users to optimise input parameters to ensure high quality output. This presents two challenges. First, it is difficult to optimise multiple input parameters for multiple input images. Second, it is difficult to achieve an understanding of underlying algorithms, in particular, relationships between input and output. Results: We present a visualisation method that transforms users’ ability to understand algorithm behaviour by integrating input and output, and by supporting exploration of their relationships. We discuss its application to a colour deconvolution technique for stained histology images and show how it enabled a domain expert to identify suitable parameter values for the deconvolution of two types of images, and metrics to quantify deconvolution performance. It also enabled a breakthrough in understanding by invalidating an underlying assumption about the algorithm. Conclusions: The visualisation method presented here provides analysis capability for multiple inputs and outputs in biomedical image processing that is not supported by previous analysis software. The analysis supported by our method is not feasible with conventional trial-and-error approaches

People of the British Isles: preliminary analysis of genotypes and surnames in a UK control population

There is a great deal of interest in fine scale population structure in the UK, both as a signature of historical immigration events and because of the effect population structure may have on disease association studies. Although population structure appears to have a minor impact on the current generation of genome-wide association studies, it is likely to play a significant part in the next generation of studies designed to search for rare variants. A powerful way of detecting such structure is to control and document carefully the provenance of the samples involved. Here we describe the collection of a cohort of rural UK samples (The People of the British Isles), aimed at providing a well-characterised UK control population that can be used as a resource by the research community as well as providing fine scale genetic information on the British population. So far, some 4,000 samples have been collected, the majority of which fit the criteria of coming from a rural area and having all four grandparents from approximately the same area. Analysis of the first 3,865 samples that have been geocoded indicates that 75% have a mean distance between grandparental places of birth of 37.3km, and that about 70% of grandparental places of birth can be classed as rural. Preliminary genotyping of 1,057 samples demonstrates the value of these samples for investigating fine scale population structure within the UK, and shows how this can be enhanced by the use of surnames