bluuebunny/crossref_metadata_2025_split huggingface dataset:
Změny kinetických charakteristik odrazu volejbalistů mládežnických kategorií v průběhu šesti měsíců
Authors: Korvas Pavel , Šamšula Jaroslav 
Published: February 2018

The authors compare four variables of an attack jump between two groups of volleyball players, juniors and cadets. We observed during six months average strength of rebound, maximal impulse of strength, the time of whole rebound and the time reaching maximal impulse of strength. Th e group of juniors had better results for every parameter but cadets reached the highest improvement. Th e younger group gets to positive changes in average strength during rebound by 17,4 %, and for the time of whole rebound about 16,6 %. Maximal impulse of strength was increased by 3,9 % and the time reaching maximal impulse of strength was shorter 14,4 %. Juniors reached smaller changes than cadets, for average strength during rebound 9,2 %, maximal impulse of strength was increased by 12,5 % and the time of whole rebound about 10,6 %. Th e value of maximal impulse of strength was worst by 5,2 %. Th e both groups realized training programme of a very high quality, juniors 342 hours and cadets 211 hour of trainings load. Th e diff erences in results and value of changes are consequences of maturity, time of regular training process and performance level of our groups.
Identifikácia a komparácia komponentov telesného zloženia vysoko trénovaných judistov
Authors: Malá Lucia , Malý Tomáš , Zahálka František , Čada Miroslav 
Published: February 2018

Authors present a high proportion of fat free mass and a low proportion of fat mass examined by hydrodensitometry in elite judo athletes. Th e diff erence in both indicators of body composition between both examined groups was signifi cant (p<0.05); however, we may see a better predisposition to sport performance in seniors when compared to juniors. Th e examination of body composition is important in terms of a sport performance predictor, as well as for monitoring changes while weight reduction. Th e form of reduction and individual limits of body weight remain the matter of further research. Th e used method, hydrodensitometry, appears as a very exact method when disturbing factors /participants’ learning phase, expiration, scales oscillation/ are eliminated. Th e measured low proportion of fat mass indicate a discussion about equations for calculation of total fat mass in the body and their modifi cation and assessment of particular parameters/ indicators.
Vliv vybraných osobnostních korelátů na kreativitu v tanci u adolescentů
Authors: Kraváčková Lenka , Blahutková Marie 
Published: February 2018

The purpose of this research is to certify influence of dance on creativity of two chosen groups of adolescents – dancers and nondancers. For this study we compiled a selection of adolescent dancers from a folklore ensemble and adolescent nondancers. They were tested with Brace test and Creativity movement test. By means of personality enquiry we received personal data from the tested groups. Using statistical methods we compared the obtained data. In the Brace Test the experimental group showed a higher score only on the substantive significance level, whereas in the test of physical creativity no statistically significant differences were found. Only the substantive significance has been proved. The results indicate that a suitable physical education form at a secondary school contributes to an all-round development in adolescents.
Analýza vztahu rytmické realizace a rytmické percepce v tanečním sportu
Authors: Vaculíková Pavlína , Svobodová Lenka , Šimberová Dagmar , Honková Kristýna 
Published: February 2018

Dance sport, like other sports belongs to the aesthetic and coordinating sports; with high demands of nearly all motoric skills. They require mainly the ability to coordinate, which is often the limiting factor of performance in dance sport. Due to the fact that dance is synonymous with music and closely associated with the rhythmic capabilities, we will focus further on detailed characteristics of the two rhythmic abilities: rhythmic perception and rhythmic execution. The research sample consisted of 153 test subjects in the age range 17-34 years. The experimental group consists of 104 dancers (53 women and 51 men). The control group consisted of 49 high school students. To examine the level of rhythmic perception, we used a test called rhythmic discrimination. To examine the level of rhythmic execution, we used a test called rhythmic drumming. We proved that dance sport has a positive effect on the level of our selected rhythmic ability, the longer the subjects danced, the better the results achieved in tests. We were unable to prove a statistically significant relationship between rhythmic perception and implementation.
Rozvoj tvorivosti študentov učiteľstva telesnej výchovy
Authors: Novotná Jarmila , Lapšanská Miroslava , Fašianok Miroslav , Bugalova Karin 
Published: February 2018

This article presents application program „Harmony in the preparation of undergraduate students of physical education teachers“. Th e experiment verifies the effects of this program on development of creativity of future teachers. Based on tests of creativity, to capture the scale of interpersonal relationships and the questionnaire revealed positive changes in the development of creative abilities of students in the experimental group interpersonal relations, climate, attitudes and personality profile.
Analýza zátěžových testů u skialpinistů
Authors: Jindra Matouš , Vomáčko Ladislav , Formánková Dita , Coufalová Klára 
Published: February 2018

We analyze 3 types of maximum stress tests on the basis of the lack of professional information about competitive ski mountaineering. Th e obtained data was compared with the maximum stress test on the treadmill; bicycle ergometer and treadmill using a roller ski modifi ed for ski mountaineering. Th e values which were measured shows great technical demands on the test using roller skis. Based on this information, we recommend long-term training on the treadmill using roller skis, before the maximum load test. Th e results show the smallest deviation of the maximum values among respondents who had previous experience with modifi ed roller skis for ski mountaineering.
3D kinematická analýza bikrosového startu
Authors: Kalichová Miriam , Hřebíčková Sylva , Labounková Romana 
Published: February 2018

Th e paper deals with techniques bicross start. Th e aim of this study is to analyse particular phases of BMX start through cinematographic metod and to evaluate basic cinematic parameters of fi rst movements. For scanning the picture we used two high-frequency synchronized digital cameras SIMI MOTION Version 7. Th e bicross start was performed by two representatives of the Czech Republic, one man and one woman. Th e result of our study is a distribution of start movement to fi ve basic phases. According to kinematic parameters of initial movements we compared diff erences between start techniques of each tested person.
Vliv psychomotoriky na pozornost dětí s ADHD
Authors: Louková Tereza , Blahutková Marie 
Published: February 2018

This work deals with the influence of the intervention program, which includes psychomotor activities to the attention of the younger school-aged children with ADHD. The aim of the work is to validate the impact of the intervention program to the attention of the younger school-aged children with ADHD. We used the quantitative-qualitative case study. We used the methods of data collection Test of Attention d2, Test of Attention “Numerical Square”, interviews and observation. We worked with 4 children in the age of 9 to 10 years with ADHD from 2 different classes of primary school. We tested the change in concentration and extent of the attention before and after application of the intervention program. We found out that concentration and extent of attention were significantly improved at each child.
Vliv plyometrického tréninku (depth jump) na běžeckou a cyklistickou ekonomiku pohybu
Authors: Bílý Jiří , Cacek Jan , Kalina Tomáš , Arnold Sunday Akaninyene 
Published: February 2018

Endurance sport performance is influenced by many factors, such as motor economies. In this research we focused on running and cycling economies. Twenty-eight first year students of Faculty of Sport science of Masaryk University (age 20.29 ± 0.94 years, height 182.32 ± 7.98 cm, weight 76.98 ± 10.03 kg) were purposively selected to participate as subjects. The test subjects were randomized into experimental group (n = 17) and control group (n = 11). Pre-test and post-test were taken on RE and CE. The PI protocol was eight weeks, twice a week, eight sets per day, and ten repetitions per set. The results showed that short-term plyometric training using depth jump had no significant effect on RE when running at 10 and 12 km.h–1. Likewise there was no significant effect on CE using strain of 1.5 W.kg–1 and 2 W.kg–1. From the point of view of practical use we do not recommend apply analogous plyometric training using declared running speed and cycling intensity.
Hodnocení individuální míry pohybové aktivity dotazníky IPAQ a Wellness Inventory: případová studie
Authors: Stará Jana , Vespalec Tomáš 
Published: February 2018

Questionnaire surveys are relatively quick, cheap and effective way of obtaining data and as such are used as a basis for designing intervention programs, and consequently also in individual work with a client. The quantitative nature of questionnaire method, however, does not cover the qualitative characteristics of individual changes in behavior and as such is limited as to the interpretation of individual behavior changes. This case study compared two questionnaire instruments – International Physical Activity Questionnaire (IPAQ) and Wellness Inventory (WI) in order to explain their advantages and disadvantages, and the ability to reflect the qualitative factors affecting the current level of physical activity of individuals. IPAQ was confirmed as a tool for monitoring the objective amount of physical activity with limited capacity for measuring individual changes. Conversely, WI focuses more on the subjective evaluation of the level of physical activity as one of the examined dimensions and is more burdened by subjective bias. Neither of the instruments directly reflected external factors (seasons, health, job change, motivation), whereas WI has been more sensitive to these influences. Both tools can be used to monitor changes in physical activity. To enhance the ability to interpret individual change it is recommended to supplement other instrumental and qualitative methods.
Návrh koncepce modelových situací v boji zblízka jako součásti výcviku speciální tělesné přípravy příslušníků Armády České republiky
Authors: Novohradský Tomáš 
Published: February 2018

The aim of this article is to introduce the issue of model situations in close combat in specific conditions of military environment. The article describes the design of concept model situations. The model situations are currently one of the dominant teaching methods among different systems of self-defense. Close Combat Training in the Army is an important factor affecting the ratings soldier in the special physical training. The proposal is a stimulus for further research and practical applications within training. The proposal recommends on based of principles of training in special physical training to create a basic framework of model situations of close combat for the Czech Army regardless of their proficiency.
ÚROVEŇ POHYBOVEJ VÝKONNOSTI MLADÝCH BASKETBALISTIEK, REPREZENTANTIEK SLOVENSKA V KATEGÓRII U14
Authors: Doležajová Ladislava , Lednický Anton 
Published: February 2018

In Slovak basketball absent a systematic monitoring and evaluation of the development of young players. The first measurement of the wider selection of U14 (n = 44) was carried out at the initiative of a national coach of this age category. The results show us, that the basic somatic indicators need to be completed by subcutaneous fat measurement and the biological age of probands. Physical height of basketball players compared with the population was higher. Up to two-thirds of the players were in above the average group, respectively significantly above average. The independence of movement performance from somatic indicators in speed targeting tests was confirmed. In the area of the movement performance were carried out tests of general movement, which should have to be completed by special basketball tests
Applicability of Worldwide CO2 Worldwide Immiscible Flooding and Prediction
Authors: Zhang Na , Wei Mingzhen , Bai Baojun 
Published: February 2018

Abstract
Carbon dioxide (CO2) flooding is a mature technology in oil industry that finds broad attention in oil production during tertiary oil recovery (EOR). After about five decades of developments, there have been many successful reports for CO2 miscible flooding. However, operators recognized after considering the safety and economics that achieving miscible phases is one of big challenge in fields with extremely high minimum miscible pressure (MMP). Compared with CO2 miscible flooding, immiscible flooding of CO2 demonstrates the great potential under varying reservoir/fluid conditions. A comprehensive and high-quality data set for CO2 immiscible flooding is built in this study. Valuable guidelines have been concluded, and production prediction models are established to further assist the applicability of new projects for the first time. Results show that along with the current method in literature to find applicability guidelines, prediction models involved with important operation and production parameters help to increase the accuracy of CO2 immiscible applicabilities. Data involved in this study are checked for independence for feature selection before utilization. We also find that support vector machine could predict the enhanced oil production rate and CO2 injection efficiency better than multiple linear regression method based on the data set. Furthermore, the multiple linear regression method build an excellent model for the prediction of enhanced oil recovery with an accuracy of almost 100%.

Introduction
A prediction model is a tool for decision making and problem solving that has been applied in variety of fields (e.g., medical science [1-3], meteorology [4], transportation [5, 6], business [7, 8], biology [9, 10], and chemistry [11, 12]) for further applicability evaluation. Eagle et al. built a prediction model to accurately estimate the risk of six month mortality after patients have been hospitalized for acute coronary syndrome (ACS), which provides guidance of the intensity of therapy to clinicians in clinical medicine [13]. Gendt et al. established a numerical weather prediction model to help people to make plans for many activities (e.g., farmers to find the best time for harvest; pilots to schedule the safest path, etc. [14]). In a prediction model, prediction accuracy mainly depends on the methodology of prediction and the quality of data that fed into the model, which is one of the crucial indicator to evaluate the effectiveness of models that researchers spare no efforts to pursue as high of an accuracy as possible.
Factors associated with elevated blood pressure or hypertension in Afro-Caribbean youth: a cross-sectional study
Authors: Ferguson Trevor S. , Younger-Coleman Novie O.M. , Tulloch-Reid Marshall K. , Bennett Nadia R. , Rousseau Amanda E. , Knight-Madden Jennifer M. , Samms-Vaughan Maureen E. , Ashley Deanna E. , Wilks Rainford J. 
Published: February 2018

Background
Although several studies have identified risk factors for high blood pressure (BP), data from Afro-Caribbean populations are limited. Additionally, less is known about how putative risk factors operate in young adults and how social factors influence the risk of high BP. In this study, we estimated the relative risk for elevated BP or hypertension (EBP/HTN), defined as BP ≥ 120/80 mmHg, among young adults with putative cardiovascular disease (CVD) risk factors in Jamaica and evaluated whether relative risks differed by sex.

Methods
Data from 898 young adults, 18–20 years old, were analysed. BP was measured with a mercury sphygmomanometer after participants had been seated for 5 min. Anthropometric measurements were obtained, and glucose, lipids and insulin measured from a fasting venous blood sample. Data on socioeconomic status (SES) were obtained via questionnaire. CVD risk factor status was defined using standard cut-points or the upper quintile of the distribution where the numbers meeting standard cut-points were small. Relative risks were estimated using odds ratios (OR) from logistic regression models.

Results
Prevalence of EBP/HTN was 30% among males and 13% among females (p < 0.001 for sex difference). There was evidence for sex interaction in the relationship between EBP/HTN and some of risk factors (obesity and household possessions), therefore we report sex-specific analyses. In multivariable logistic regression models, factors independently associated with EBP/HTN among men were obesity (OR 8.48, 95% CI [2.64–27.2], p < 0.001), and high glucose (OR 2.01, CI [1.20–3.37], p = 0.008), while high HOMA-IR did not achieve statistical significance (OR 2.08, CI [0.94–4.58], p = 0.069). In similar models for women, high triglycerides (OR 1.98, CI [1.03–3.81], p = 0.040) and high HOMA-IR (OR 2.07, CI [1.03–4.12], p = 0.039) were positively associated with EBP/HTN. Lower SES was also associated with higher odds for EBP/HTN (OR 4.63, CI [1.31–16.4], p = 0.017, for moderate vs. high household possessions; OR 2.61, CI [0.70–9.77], p = 0.154 for low vs. high household possessions). Alcohol consumption was associated with lower odds of EBP/HTN among females only; OR 0.41 (CI [0.18–0.90], p = 0.026) for drinking <1 time per week vs. never drinkers, and OR 0.28 (CI [0.11–0.76], p = 0.012) for drinking ≥3 times per week vs. never drinkers. Physical activity was inversely associated with EBP/HTN in both males and females.

Conclusion
Factors associated with EBP/HTN among Jamaican young adults include obesity, high glucose, high triglycerides and high HOMA-IR, with some significant differences by sex. Among women lower SES was positively associated with EBP/HTN, while moderate alcohol consumption was associated lower odds of EBP/HTN.
Microseismic Monitoring of Stimulating Shale Gas Reservoir in SW China: 1. An Improved Matching and Locating Technique for Downhole Monitoring
Authors: Meng Xiaobo , Chen Haichao , Niu Fenglin , Tang Youcai , Yin Chen , Wu Furong 
Published: February 2018

AbstractWe introduce an improved matching and locating technique to detect and locate microseismic events (−4 < ML < 0) associated with hydraulic fracturing treatment. We employ a set of representative master events to act as template waveforms and detect slave events that strongly resemble master events through stacking cross correlograms of both P and S waves between the template waveforms and the continuous records of the monitoring array. Moreover, the residual moveout in the cross correlograms across the array is used to locate slave events relative to the corresponding master event. In addition, P wave polarization constraint is applied to resolve the lateral extent of slave events in the case of unfavorable array configuration. We first demonstrate the detectability and location accuracy of the proposed approach with a pseudo‐synthetic data set. Compared to the matched filter analysis, the proposed approach can significantly enhance detectability at low false alarm rate and yield robust location estimates of very low SNR events, particularly along the vertical direction. Then, we apply the method to a real microseismic data set acquired in the Weiyuan shale reservoir of China in November of 2014. The expanded microseismic catalog provides more easily interpretable spatiotemporal evolution of microseismicity, which is investigated in detail in a companion paper.
Changes in Physical Properties of the Nankai Trough Megasplay Fault Induced by Earthquakes, Detected by Continuous Pressure Monitoring
Authors: Kinoshita C. , Saffer D. , Kopf A. , Roesner A. , Wallace L. M. , Araki E. , Kimura T. , Machida Y. , Kobayashi R. , Davis E. , Toczko S. , Carr S. 
Published: February 2018

AbstractOne primary objective of Integrated Ocean Drilling Program Expedition 365, conducted as part of the Nankai Trough Seismogenic Zone Experiment, was to recover a temporary observatory emplaced to monitor formation pore fluid pressure and temperature within a splay fault in the Nankai subduction zone offshore SW Honshu, Japan. Here we use a 5.3 year time series of formation pore fluid pressure, and in particular the response to ocean tidal loading, to evaluate changes in pore pressure and formation and fluid elastic properties induced by earthquakes. Our analysis reveals 31 earthquake‐induced perturbations. These are dominantly characterized by small transient increases in pressure (28 events) and decreases in ocean tidal loading efficiency (14 events) that reflect changes to formation or fluid compressibility. The observed perturbations follow a magnitude‐distance threshold similar to that reported for earthquake‐driven hydrological effects in other settings. To explore the mechanisms that cause these changes, we evaluate the expected static and dynamic strains from each earthquake. The expected static strains are too small to explain the observed pressure changes. In contrast, estimated dynamic strains correlate with the magnitude of changes in both pressure and loading efficiency. We propose potential mechanism for the changes and subsequent recovery, which is exsolution of dissolved gas in interstitial fluids in response to shaking.
Modeling the Geometry of Plate Boundary and Seismic Structure in the Southern Ryukyu Trench Subduction Zone, Japan, Using Amphibious Seismic Observations
Authors: Yamamoto Y. , Takahashi T. , Ishihara Y. , Kaiho Y. , Arai R. , Obana K. , Nakanishi A. , Miura S. , Kodaira S. , Kaneda Y. 
Published: February 2018

AbstractHere we present the new model, the geometry of the subducted Philippine Sea Plate interface beneath the southern Ryukyu Trench subduction zone, estimated from seismic tomography and focal mechanism estimation by using passive and active data from a temporary amphibious seismic network and permanent land stations. Using relocated low‐angle thrust‐type earthquakes, repeating earthquakes, and structural information, we constrained the geometry of plate boundary from the trench axis to a 60 km depth with uncertainties of less than 5 km. The estimated plate geometry model exhibited large variation, including a pronounced convex structure that may be evidence of a subducted seamount in the eastern portion of study area, whereas the western part appeared smooth. We also found that the active earthquake region near the plate boundary, defined by the distance from our plate geometry model, was clearly separated from the area dominated by short‐term slow‐slip events (SSEs). The oceanic crust just beneath the SSE‐dominant region, the western part of the study area, showed high Vp/Vs ratios (>1.8), whereas the eastern side showed moderate or low Vp/Vs (<1.75). We interpreted this as an indication that high fluid pressures near the surface of the slab are contributing to the SSE activities. Within the toe of the mantle wedge, P and S wave velocities (<7.5 and <4.2 km/s, respectively) lower than those observed through normal mantle peridotite might suggest that some portions of the mantle may be at least 40% serpentinized.