86,522 research outputs found
Performance analysis in field hockey goalkeeping during penalty corners: a case study.
No full textAbstract
BACKGROUND:
To investigate the kinematics of field hockey goalkeeping during penalty corners, in order to provide the first model of performance from a physical standpoint during this particular and important phase of goalkeeping that goes from the injection of the ball (the push-in) up to the shot on goal during a penalty corner. In particular, the focus was on the preparation phase before the actual saves.
METHODS:
Four goalkeepers playing at the international level (age: 22±2.45 years; height: 1.85±0.09 m; body weight: 79.25±8.42 kg; BMI: 23.06±0.69 kg·m-2; role experience 11.5±1.91 years; international caps: 30.00±15.25) participated in the study. A complete video footage was recorded using two high-speed video cameras, using 210 fps sampling rates.
RESULTS:
The goalkeepers covered 1.48±0.32 m, using 3.23±0.43 steps, from the goal line in about 1.33±0.21 s. The estimated mean acceleration was 0.93±0.54 m·s-2. Differences in these parameters were found among the goalkeepers (One-Way ANOVA; p<0.05, ES as partial η²>0.14), also demonstratinga different technical efficiency in relation to the task to be performed.
CONCLUSIONS:
The results of this case study confirm that the principal aim of the goalkeepers during the preparation phase of defending penalty corners is to arrive in the best position of readiness within the available time frame of about 1.5 s. They ran out from the goal line about 1.5 m, not reaching an ideal better distance (≈ 4m), for tactical reasons, concerning the possible interventions of other attackers arriving close to the posts, to enlarge the goalmouth
The optimal exercise to rest ratios in repeated sprint ability training in youth soccer players.
No full textExercise-to-rest ratios in repeated sprint ability training in women's soccer
No full textBACKGROUND: The aim of this study was to investigate the applicability of three different exercise-to-rest ratios in repeated sprint ability (RSA) training in women's soccer players, applying those which are usually adopted in male adult and young players, when performing three different sprinting modes (straight, shuttle, and sprinting with changing of direction). METHODS: Fifteen trained female soccer players (height: 1.65±0.06 m; weight: 59.3±9.0 kg; BMI 21.6±2.7 kg/m2; age: 23.3±5.9 years) participated to the study. In order to compare the different values of the time recorded, an index of fatigue (IF%) was used. Recovery times among trials in the sets were administered according to the 1:5, 1:3, 1:2 exercise-to-rest ratio, respectively. Blood lactate concentrations at the end of each set were analyzed. RESULTS: Significant differences among trials within each set (repeated measures ANOVA; P<0.05) were found, as evidence of fatigue over time, with an average decay of performance of about 5% but no significant differences were found in IF%, among the three different sprinting modalities when applying the investigated exercise-to-rest ratios (factorial ANOVA; P>0.05). Significant differences were found in blood lactate concentrations (P<0.05). CONCLUSIONS: The results of this study confirm that the exercise-to-rest ratios considered in this study might be suitable to design effective testing protocols and training sessions aimed at the development of the RSA in women's soccer players, keeping the performances in the speed domain (IF% <7-8%) but inducing the fatigue processes sought with this kind of training method
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Acute effects of two different initial heart rates on testing the Repeated Sprint Ability in young soccer players.
No full textThe aim of this paper was to investigate the acute effects of two different initial heart rates intensities when testing the repeated sprint ability (RSA) performances in young soccer players
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
John F. Kennedy telegram to Roosevelt
No full textJersey Homesteads (later the Borough of Roosevelt) was established in the 1930s as an agro-industrial cooperative community. It was established specifically for urban Jewish garment workers, many of whom had emigrated from Europe. President John F. Kennedy sent a telegram to the citizens of Roosevelt, New Jersey, apologizing for not being able to attend the memorial dedication in honor of former President Franklin Delano Roosevelt. (Jersey Homesteads became Roosevelt in 1945 in honor of the president.) President Kennedy expressed his gratitude to the people of Roosevelt for constructing the memorial, and commented that it will serve as a constant reminder of Roosevelt's good works
"L'associazione Mitoxantrone intraperitoneale e Timopentina come terapia dell'ascite ricorrente nel carcinoma ovarico".
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