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Search Results: 1 - 10 of 324937 matches for " S. Sterkowicz "
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S. Sterkowicz,G. Lech,T. Pa?ka,A. Tyka
Biology of Sport , 2011,
Abstract: The aim of the present study was to (1) find differences in body build and aerobic and anaerobic capacity between young judoists and untrained peers; (2) compare correlations for indicators of body build with indicators of aerobic and anaerobic capacity among the group of trained and untrained subjects. The study group comprised 18 subjects selected during a competitive period, who had taken at least fifth place in national judo tournaments. Their training experience ranged from 6 to 11 years, 8 to 10 hours a week. The control group was composed of 18 untrained students from one of the schools included in the study. Their body height and mass (BM) did not differ compared to judoists. A body composition chart was employed for analysis of body build and body composition. Physiological investigations encompassed measurements of anaerobic (Wingate test) and aerobic (graded exercise test on cycle ergometer) capacity. Judo contestants are typically characterized by higher BMI, fat-free mass and fat-free mass index compared to the untrained. Compared to the group of untrained peers, young athletes in this sport are distinguished by the time needed to generate peak power. This difference is not observed in the indices characterising aerobic capacity. The level of the indices of body build and composition in young judo contestants shows a moderate and strong correlation with indices of anaerobic and aerobic capacity. The amount of total work in the Wingate test was positively correlated with BMI (r=0.65, p<0.01), fat-free mass index (r=0.63, p<0.01), body mass (r=0.49, p<0.05), fat mass index (r=0.49, p<0.05) and percentage of fat (r=0.48, p<0.05). Maximal peak anaerobic power was positively correlated with fat-free mass index (r=0.48, p<0.05) and percentage of fat (r=0.50, p<0.05). A strong negative correlation between ·VO2max with body mass (r=-0.75, p<0.001), BMI (r=-0.72, p<0.001), moderate correlation with PF%(r=-0.64, p<0.01), fat-free mass index (r=-0.52, p<0.05), and fat mass index (-0.67, p<0.01) were observed. Heart rate at the anaerobic threshold (%max) showed positive relationships with fat-free mass index (r=0.52, p<0.05). In the untrained subjects, only a negative relationship between BM and TOPP was observed (r=-0.48, p<0.05). These findings confirm interrelations between structural and functional parameters, developed through many years of training. Although physical capacity might affect the course of a fight, it should be considered....
Body composition and somatotype of the top of polish male karate contestants
K Sterkowicz-Przybycień
Biology of Sport , 2010,
Abstract: The aim of this study was to determine body composition and somatotype of male karateists who were grouped by different level of competition and techniques used in effective attack. Analysis of body composition, with untrained men as a background, will update the data necessary for determination of somatic profiles of karateists. Thirty contestants were examined during the camp in Polish Olympic Training Center in Zakopane. The participants had level of competition at both international (I group, n=14) and national level (N group, n=16). Karateists were also grouped on the basis of the preferred techniques used in effective attack, i.e. hits with hand (H, n=12), hits with hand and legs (HL, n=11) or kicks (L group, n=7). An experienced evaluator performed 10 measurements necessary to designate somatotypes by means of Heath-Carter method and to estimate the percentage of body fat and composition. Group I were not significantly heavier than group N. Group I had higher mesomorphy and lower ectomorphy than group N (t-test). Group I were characterized by higher BMI and fat free mass index than karateists of the group N. Results from discriminant analysis were significant. Amongst the observations used to fit the model, (67%) were correctly classified. There were statistically significant differences between competitors grouped by techniques used in attack as endomorphy (H>HL, H>L) and ectomorphy (H Keywords karate --- Somatotype --- sport level --- Techniques
Techniques frequently used during London Olympic judo tournaments: a biomechanical approach
Stanislav Sterkowicz,Attilio Sacripanti,Katarina Sterkowicz_Przybycien
Physics , 2013,
Abstract: Feedback between training and competition should be considered in athletic training.The aim of the study was contemporary coaching tendencies in women s and men s judo with particular focus on a biomechanical classification of throws and grappling actions. Throwing technique frequencies grouped in the seven biomechanical classes were dependent on gender. A significant difference was found between frequencies of variable arm of physical lever technique scored by males and females as compared to the techniques counts. Significant differences between men who competed in extra lightweight and heavy weight concerned the frequency of the techniques used with maximum arm or variable arm of physical lever and a couple of forces applied by trunk and legs.In females a tendency to higher frequency of techniques that used couple of forces applied by arm or arms and leg was observed in extra lightweight compared to the heavy weight. Because the technique preferred in the fight depends on a gender and weight category of a judoka, the relationships found in this study, which can be justified by the biomechanics of throws, should be taken into consideration in technical and tactical coaching of the contestants. A method used in this study can be recommended for future research concerning coaching tendencies
The effects of training and creatine malate supplementation during preparation period on physical capacity and special fitness in judo contestants
Sterkowicz Stanislaw,Tyka Anna K,Chwastowski Michal,Sterkowicz-Przybycień Katarzyna
Journal of the International Society of Sports Nutrition , 2012, DOI: 10.1186/1550-2783-9-41
The need of a weight management control program in judo: a proposal based on the successful case of wrestling
Guilherme G Artioli, Emerson Franchini, Humberto Nicastro, Stanislaw Sterkowicz, Marina Y Solis, Antonio H Lancha
Journal of the International Society of Sports Nutrition , 2010, DOI: 10.1186/1550-2783-7-15
Abstract: Judo is an Olympic sport practiced all over the world. Some studies reported that judo athletes present highly developed strength, anaerobic power and capacity, aerobic power, flexibility and low levels of body fat [1]. A more detailed comparison between elite and non-elite judo competitors revealed that high level judo athletes present more developed upper body muscle mass, higher upper body anaerobic power and capacity, and higher ability to perform high-intensity intermittent specific judo activities [2]. In all official competitions, judo athletes are paired with opponents of similar body weight through weight classes. The aim of such division is to ensure fairness and promote evenhanded combats in terms of strength, leverage and agility. However, it is well known that most judo competitors use several harmful methods of rapid weight loss in an attempt to classify for a lighter weight class and, by doing so, to obtain competitive advantage against lighter and weaker opponents [3].The rapid weight loss is a well documented problem in collegiate wrestling. Since the 1970's, studies have characterized the patterns of rapid weight loss among wrestlers [4,5]. Surveys addressing such patterns reported that ~80% of competitors engage in weight loss procedures [4,5]. According to these studies, the most prevalent nutritional strategies for reducing weight are severe fluid and food restriction, using saunas and heated rooms and exercising with rubberized suits. The use of diuretics, laxatives, diet pills and even self-induced vomiting are extreme methods often reported in the literature [4]. Athletes reduce body weight several times per season and the magnitude of weight cycling is of about 5% to 10% of body weight [4]. Athletes start losing weight very early in their competitive life. Although adolescence is the period during which athletes most often begin cutting weight, a few athletes might start unhealthy weight loss procedures at very early ages, as was the impress
Study of the Structural and Electrical Properties of Cr-Doped BiFeO3 Ceramic  [PDF]
S. S. Arafat, S. Ibrahim
Materials Sciences and Applications (MSA) , 2017, DOI: 10.4236/msa.2017.810051
Abstract: Multiferroic BiFe1-xCrxO3 (x = 0.2 and 0.4) ceramics were synthesized in a single phase. The effects of Cr3+ substitution on the crystal structure, dielectric permittivity and leakage current were investigated. Preliminary X-ray structural studies revealed that the samples had a rhombohedral perovskite crystal structure. The dielectric constant ε' significantly increased while the dielectric loss tanδ was substantially decreased with the increase in Cr3+ substitution. The temperature effect on the dielectric properties exhibited an anomaly corresponding to magneto-electric coupling in the samples and was shifted to lower temperatures with the increase in Cr3+ substitution. The leakage current density also reduced in magnitude with the increase in the Cr3+ substitution.
Degree Splitting of Root Square Mean Graphs  [PDF]
S. S. Sandhya, S. Somasundaram, S. Anusa
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.66086
Abstract: Let \"\" be an injective function. For a vertex labeling f, the induced edge labeling \"\" is defined by, \"\" or \"\"; then, the edge labels are distinct and are from \"\". Then f is called a root square mean labeling of G. In this paper, we prove root square mean labeling of some degree splitting graphs.
A Parameter Estimation Model of G-CSF: Mathematical Model of Cyclical Neutropenia  [PDF]
S. Balamuralitharan, S. Rajasekaran
American Journal of Computational Mathematics (AJCM) , 2012, DOI: 10.4236/ajcm.2012.21002
Abstract: We investigate the FFT (Fast Fourier Transform) model and G-CSF (granulocyte colony-stimulating factor) treatment of CN (Cyclical Neutropenia). We collect grey collies and normal dog’s data from CN and analyze the G-CSF treatment. The model develops the dynamics of circulating blood cells before and after the G-CSF treatment. This is quite natural and useful for the collection of laboratory data for investigation. The proposed interventions are practical. This reduces the quantity of G-CSF required for potential maintenance. This model gives us good result in treatment. The changes would be practical and reduce the risk side as well as the cost of treatment in G-CSF.
Synthesis, Thermal Behaviour, XRD, and Luminescent Properties of Lighter Lanthanidethiodipropionate Hydrates Containing Aminogunidine as Neutral Ligand  [PDF]
S. Packiaraj, S. Govindarajan
Open Journal of Inorganic Chemistry (OJIC) , 2014, DOI: 10.4236/ojic.2014.43006
Aminoguanidine lanthanide thiodipropionate hydrates of composition [Ln(Agun)2(tdp)3·nH2O], Agun = Aminoguanidine, tdp = thiodipropionic acid, where Ln = La, Pr, Nd and Sm if n = 2, have been prepared and characterized by physic-chemical techniques.
Fuzzy Based Intelligent Monitoring of Critical Lines in the Restructured Power Market  [PDF]
S. Rajasekaran, S. Sathiyamoorthy
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.79191
Abstract: Restructured electric market environment allows the power wheeling transactions between the power producers and customers to meet the growing load demand. This will lead to the possible of congestion in the transmission lines. The possible contingencies of power components further worsen the scenario. This paper describes the methodology for the identification of critical transmission line by computing the real power and reactive power performance indices. It also demonstrates the importance of fuzzy logic technique used to rank the transmission lines according to the severity and demonstrated on IEEE-30 bus system.
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