scholarly journals THE EFFECT OF COMPOUND EXERCISES WITH ADDED WEIGHTS ON SOME PHYSICAL ABILITIES OF YOUTH SOCCER PLAYERS AGED (17-19) YEARS

2021 ◽  
Vol 11 (2) ◽  
Author(s):  
Hasanin Hashem Ismail Al-Qaisi ◽  
Prof. Dr. Sabah Qasim Khalaf
Keyword(s):  
Physical Performance ◽  
Vertical Jump ◽  
Great Effort ◽  
Youth Group ◽  
Youth Soccer ◽  
Sports Club ◽  
Jump Test ◽  
The World ◽  
Physical Abilities ◽  
The Stability

The development of the level of physical performance reached by the game of football, which requires players to exert great effort, and it is observed in the world championships, the World Cup, international and regional championships, the physical performance reaching high levels and- Preparing compound exercises with weights added according to body weight for players of Al-Zawraa Sports Club in football, youth group of ages (17-19) years and There are statistically significant differences between the pre and post tests for both groups in favor of the post tests and The researcher believes that the reason for the development of the results of the vertical jump test from the stability of the three groups is due to the exercises used that were assigned to the players.

scholarly journals Relationship between Cognitive Functions and Sport-Specific Physical Performance in Youth Volleyball Players

2021 ◽  
Vol 11 (2) ◽  
pp. 227
Author(s):  
Athos Trecroci ◽  
Marco Duca ◽  
Luca Cavaggioni ◽  
Alessio Rossi ◽  
Raffaele Scurati ◽  
...  
Keyword(s):  
Reaction Time ◽  
Physical Performance ◽  
Motor Skills ◽  
Cognitive Functions ◽  
Flanker Task ◽  
Vertical Jump ◽  
Volleyball Players ◽  
Performance Context ◽  
Physical Abilities ◽  
D Value

The aim of this study was to investigate the relationship between basic cognitive functions and sport-specific physical performance in young volleyball players. Forty-three female volleyball players (age 11.2 ± 0.8 years) were tested for cognitive performance by measuring simple reaction time (clinical reaction time), executive control (Flanker task), and perceptual speed (visual search task). Moreover, a set of tests was used to assess physical abilities as volleyball-specific skills (accuracy of setting, passing, and serving) and motor skills (change of direction, vertical jump, and balance). A cumulated value for both cognitive and sport-specific physical performance tests was computed by adding up each test’s domain outcomes. Pearson’s r correlation analysis showed a large positive correlation (r = 0.45, d-value = 1.01) of the cumulated score summarizing cognitive functions with the cumulated score summarizing sport-specific physical performance. Moreover, small-to-medium correlations (d-value from 0.63 to 0.73) were found between cognitive and motor skills. Given the cumulative scores, these results suggest that volleyball athletes with superior basic cognitive functions present better sport-specific physical performance. Our findings encourage to extend the knowledge of the associations between cognitive and motor skills within a sports performance context.

scholarly journals Physical Skills in Male Volleyball Players 14-18 Years Old

2022 ◽  
Vol 5 (1) ◽  
pp. 1
Author(s):  
Altin Martiri
Keyword(s):  
Vertical Jump ◽  
Body Height ◽  
Age Groups ◽  
Mean Difference ◽  
Best Interest ◽  
Jump Test ◽  
Volleyball Players ◽  
Long Jump ◽  
Physical Abilities ◽  
Run Up

During the monitoring of volleyball teams in Albania during training, it was noticed that coaches pay more attention to technical elements and not to physical abilities to ages 14-18 years. The aim of this study was to find out the trend of improvement and differences with the age on physical abilities of male’s volleyball players in Albania. Methods: Participants in this study were N=43 volleyball players from two age categories; N=21, cadet (14-16 yrs.), N= 22 and junior (16-18 yrs.) Measurement for anthropometrics (body weight, body height) and physical abilities (push up test, curl-up test, standing long jump and vertical jump test) were assessed. Results: Analysis between two age categories shows significant differences. Showed results for anthropometrics and also for physical abilities showed differences between groups of volleyball players. Data of this study for jumping performance using vertical jump CMJ test between groups for cadet vs. junior data show (mean difference= 21.3 cm; Sig= 0.004) while for vertical jump Run up test between groups for cadet vs. junior data show (mean difference= 22.3 cm; Sig= 0.003). Conclusion: In the best interest of the study, it would be good if other teams were involved from different cities of Albania. Suggestions for other studies we recommend in comparing data by positions in the field. Trainers should plan training with these age groups different coordination programs not only technical. This study has limitations with regards to the sampling number of male volleyball players, which is justified for not having sufficient funds.

scholarly journals Training Loads and RSA and Aerobic Performance Changes During the Preseason in Youth Soccer Squads

2018 ◽  
Vol 65 (1) ◽  
pp. 235-248
Author(s):  
Tiago Cetolin ◽  
Anderson Santiago Teixeira ◽  
Almir Schmitt Netto ◽  
Alessandro Haupenthal ◽  
Fábio Yuzo Nakamura ◽  
...  
Keyword(s):  
Physical Performance ◽  
Performance Measures ◽  
Perceived Exertion ◽  
Age Groups ◽  
Rating Of Perceived Exertion ◽  
Soccer Players ◽  
Aerobic Performance ◽  
Youth Soccer ◽  
Before And After ◽  
Physical Abilities

AbstractThe aims of this study were to compare the internal training load (ITL) in soccer players of two competitive age groups (under-15 [U-15] and under-19 [U-19]) during an 8-week preseason training period and compare the associated changes in physical performance measures. Eighteen U-15 and twelve U-19 players were monitored over an 8-week period during the preseason phase. The ITL was monitored using the session rating of perceived exertion (RPE) method. Before and after the preseason period, physical performance was assessed by best (RSAbest) and mean (RSAmean) times in a repeated sprint ability (RSA) test and peak velocity derived from the Carminatti test (PVT-CAR). Total weekly ITL increased with age (U-15: 13770 ± 874 AU vs. U-19: 33584 ± 2506 AU; p < 0.001). In addition, U-19 players perceived training sessions as heavier than U-15 players (6.1 ± 0.3 vs. 5.3 ± 0.3 AU, respectively; p < 0.001). After the preseason period, very likely to almost certainly positive changes were observed for all performance measures in both age groups. However, the U-15 group had possibly superior gains in RSAbest (+1.40%, 90%CL -0.29 to 3.05, with ES = 0.35) and likely higher effects in RSAmean (+1.89%, 90%CL 0.04 to 3.70, with ES = 0.53) and PVT-CAR (+2.71%, 90%CL 0.35 to 5.01, with ES = 0.37) compared to the U-19 group. In conclusion, our findings demonstrate that the U-19 group accumulate higher total weekly ITLs than the U-15 group during the preseason phase due to longer and heavier training sessions. However, the U-15 group obtained superior gains in soccer-specific physical abilities while accumulating half the total ITLs during lighter training sessions.

scholarly journals El ciclo menstrual no afecta el desempeño físico de jóvenes eumenorreicas (Menstrual cycle does not affect physical performance in eumenorrheic youth)

Retos ◽  
2020 ◽  
pp. 264-266
Author(s):  
Jorge Alberto Aburto-Corona ◽  
Iris Jaquelinne Gil González ◽  
Vanessa Natasha Vega Aguilar ◽  
Juan José Calleja Núñez
Keyword(s):  
Menstrual Cycle ◽  
Physical Performance ◽  
Repeated Measures ◽  
Vertical Jump ◽  
Friedman Test ◽  
Physically Active ◽  
Jump Test ◽  
Grasa Corporal ◽  
History Of ◽  
Apparently Healthy

 El objetivo de este estudio fue determinar si las fases del ciclo menstrual influyen en el salto vertical y en la resistencia aeróbica. Trece estudiantes universitarias asistieron en tres ocasiones aleatorias al Laboratorio de Biociencias de la Motricidad Humana: en la fase folicular (FFolicular), ovulatoria (EOvulatoria) y lútea (FLútea) (entre los días 7 - 9, 12 - 14 y 23 - 25 de su ciclo menstrual regular, respectivamente), todas ellas eumenorreicas, físicamente activas, aparentemente sanas y sin historial de haber ingerido hormonas (edad = 20.8 ± 1.0 años; talla = 157.8 ± 6.0 cm; peso = 59.4 ± 6.8 kg; grasa corporal = 27.5 ± 5.8 %). En cada visita realizaron una prueba de salto vertical y una de resistencia aeróbica. Mediante un test de Friedman de muestras relacionadas, no se encontraron diferencias en el salto vertical (FFolicular = 38.1 ± 14.4 cm, EOvulatoria = 36.0 ± 14.2 cm, FLútea = 36.7 ± 14.4 cm; p = 0.075) ni en la resistencia aeróbica (FFolicular = 783.6 ± 126.9 metros, EOvulatoria = 812.9 ± 179.1 metros, FLútea = 784.5 ± 128.8 metros; p = 0.775) entre las diferentes fases del ciclo menstrual. Los resultados demuestran que el ciclo menstrual no mejora ni empeora el desempeño físico de mujeres jóvenes eumenorreicas.  Abstract. The purpose of this study was to determine if the phases of the menstrual cycle influence vertical jump and aerobic resistance. Thirteen university students attended the Laboratory of Biosciences of Human Motricity on three random occasions: follicular (FFolicular), ovulatory (EOvulatoria) and luteal (FLútea) phase (between days 7 - 9, 12 - 14 and 23 - 25 of their regular menstrual cycle, respectively). All of them were eumenorrheic, physically active, apparently healthy, and had no history of ingesting hormones (age = 20.8 ± 1.0 years; height = 157.8 ± 6.0 cm; weight = 59.4 ± 6.8 kg; body fat = 27.5 ± 5.8%). At each visit, they performed a vertical jump test and an aerobic resistance test. Using Friedman test of repeated measures, no differences were found in vertical jump (FFolicular = 38.1 ± 14.4 cm, EOvulatoria = 36.0 ± 14.2 cm, FLútea = 36.7 ± 14.4 cm; p = 0.075) nor in aerobic resistance (FFolicular = 783.6 ± 126.9 meters, EOvulatoria = 812.9 ± 179.1 meters, FLútea = 784.5 ± 128.8 meters; p = 0.775) between the different phases of the menstrual cycle. The results show that menstrual cycle does not improve or worsen physical performance in eumenorrheic young women.

Unveiling the Theoretical Mistakes in the World Bank Formation and its Implication on Survival of Africa Monetary Union

2019 ◽  
Vol 10 (1) ◽  
pp. 119-124
Author(s):  
Olatunji Abdul Shobande ◽  
Kingsley Chinonso Mark
Keyword(s):  
World Bank ◽  
Monetary Union ◽  
Political Interest ◽  
World Bank Group ◽  
Policy Makers ◽  
The World Bank ◽  
The World ◽  
Bank Group ◽  
The Stability ◽  
Developed Nations

Abstract The quest for urgent solution to resolve the world liquidity problem has continued to generate enthusiastic debates among political economists, policy makers and the academia. The argument has focused on whether the World Bank Group was established to enhance the stability of international financial system or meant to enrich the developed nations. This study argues that the existing political interest of the World Bank Group in Africa may serve as lesson learned to other ambitious African Monetary Union.

Four Conceptions of Authority in International Relations

2021 ◽  
pp. 1-25
Author(s):  
Jorg Kustermans ◽  
Rikkert Horemans
Keyword(s):  
International Relations ◽  
Emotional Experience ◽  
Political Actors ◽  
International Authority ◽  
The World ◽  
Authority Relations ◽  
The Stability

Abstract There is increasing agreement that states and other political actors on the world stage sometimes achieve international authority. However, there is less agreement about the nature and functioning of international authority relations. What determines whether an actor will be recognized as an authoritative actor? And what are the effects thereof? In this essay, we identify four distinct conceptions of authority in the study of international relations: authority as contract, authority as domination, authority as impression, and authority as consecration. Consideration of the typology leads to two important insights. First, the phenomenon of authority has an essentially experiential dimension. Subordinate actors’ emotional experience of authority determines their response to authority and thus also has a fundamental impact on the stability of authority. Second, the emergence of forms of international authority does not entail, at least not necessarily, the weakening of the sovereignty of states, but can equally be argued to strengthen it.

scholarly journals Effects of Maximal Sodium and Potassium Conductance on the Stability of Hodgkin-Huxley Model

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Yue Zhang ◽  
Kuanquan Wang ◽  
Yongfeng Yuan ◽  
Dong Sui ◽  
Henggui Zhang
Keyword(s):  
Experimental Data ◽  
Mathematical Method ◽  
Bifurcation Point ◽  
Potassium Conductance ◽  
Maximal Conductance ◽  
Computing Model ◽  
The World ◽  
Stability And Bifurcations ◽  
The Stability ◽  
Sodium And Potassium

Hodgkin-Huxley (HH) equation is the first cell computing model in the world and pioneered the use of model to study electrophysiological problems. The model consists of four differential equations which are based on the experimental data of ion channels. Maximal conductance is an important characteristic of different channels. In this study, mathematical method is used to investigate the importance of maximal sodium conductanceg-Naand maximal potassium conductanceg-K. Applying stability theory, and takingg-Naandg-Kas variables, we analyze the stability and bifurcations of the model. Bifurcations are found when the variables change, and bifurcation points and boundary are also calculated. There is only one bifurcation point wheng-Nais the variable, while there are two points wheng-Kis variable. The (g-Na,  g-K) plane is partitioned into two regions and the upper bifurcation boundary is similar to a line when bothg-Naandg-Kare variables. Numerical simulations illustrate the validity of the analysis. The results obtained could be helpful in studying relevant diseases caused by maximal conductance anomaly.

Foreign exchange earnings of the countries of the world from international trade in fruit and berry products

2021 ◽  
pp. 45-56
Author(s):  
Rafail R. Mukhametzyanov ◽  
◽  
Nikolay G. Platonovskiy ◽  
Akhmed M. Khezhev ◽  
Tatiyana V. Ostapchuk ◽  
...  
Keyword(s):  
International Trade ◽  
Foreign Exchange ◽  
Import Substitution ◽  
World Order ◽  
Climatic Conditions ◽  
The European Union ◽  
The World ◽  
Increasing Demand ◽  
Processed Products ◽  
The Stability

In the context of the modern global financial world order, an important element of the stability of the national monetary unit of the overwhelming majority of countries in the world, especially developing countries, is foreign exchange earnings. For some countries with favorable natural and climatic conditions, the production, processing and export of agricultural products plays a significant role in the overall structure of foreign exchange earnings in the country. The constantly increasing demand from consumers for fruits, berries, nuts and their processed products allows economic entities of national fruit and berry subcomplexes to increase the volume of growing and exporting these types of products. This study analyzes the change in the volume of exports and imports of fruit and berry products in value terms for the period 2010-2019. It is revealed that some states, being the largest exporters of fruits, berries, nuts and products of their processing, occupy significant positions in the import of these types of products from abroad. Based on the author’s calculations, the top 30 countries of the world have been compiled in terms of net foreign exchange earnings from international trade in this type of product. According to this indicator, the first line with a level of $ 7.506 billion was occupied by Spain, while it increased it by $ 1.675 billion over 10 years. As for Russia, despite the counter-sanctions against the countries of the European Union and some other countries of the world, as well as the ongoing policy of import substitution, including in domestic gardening, it continues to be one of the main importers of fruits, berries, nuts and their processing products in the world. Thus, our country supports both foreign producers and other commercial structures that carry out the processes of commodity circulation of fruit and berry products, and the receipt of foreign exchange earnings in these powers.

Consumer Behavior Changes Post Pandemic Covid-19

2020 ◽  
Vol 2 (2) ◽  
pp. 84-89
Author(s):  
Tati Maryati
Keyword(s):  
Consumer Behavior ◽  
Eating Habits ◽  
Supply And Demand ◽  
Health Economy ◽  
Behavior Changes ◽  
The World ◽  
The Stability ◽  
The Many ◽  
New Consumer ◽  
At Home

The Corona virus or Covid-19 which is unexpected will come to us, has an impact on health, economy and also humanity throughout the world and is able to fundamentally change the world. Supplements are disrupted because production is stopped, retail stores close, causing consumers to change their behavior, which had previously gone offline shopping. Not just shopping, when a pandemic, the way of thinking becomes different. Consumers around the world are looking for products and brands through new ways and new habits are formed. Online transactions focus more on basic products to make ends meet. The fact that Covid-19's anti-virus has not been found raises concerns about disrupted health and the Government's regulation to work and stay at home also raises concerns about disrupted businesses. Differences from habits and interests or preferences that are different for each person, provide different responses to the problems faced and solutions for the future. The habit of shopping offline has a tendency to continue for complementary products while food products are more directed towards offline. The rest eating habits at home can be continued because it provides more hygiene guarantees. The new habit of holding online meetings with distant relatives or colleagues will be increasingly considered given the many more positive things that can be obtained. Likewise with work problems, working from home is more interesting to consider because it is more efficient and effective and the results can be more productive. This new consumer behavior is adjusted to provide satisfaction for many parties, with the assistance of institutions or governments that oversee the security of supply and demand and maintain the stability of both. 

scholarly journals Sleep Data, Physical Performance, and Injuries in Preparation for Professional Mixed Martial Arts

Sports ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 1 ◽  
Author(s):  
Corey Peacock ◽  
Mauricio Mena ◽  
Gabriel Sanders ◽  
Tobin Silver ◽  
Douglas Kalman ◽  
...  
Keyword(s):  
Heart Rate ◽  
Physical Performance ◽  
Performance Measures ◽  
Martial Arts ◽  
Sleep Latency ◽  
Heart Rate Recovery ◽  
Vertical Jump ◽  
Performance Testing ◽  
Sleep Efficiency ◽  
Mixed Martial Arts

The purpose of this investigation is to present observational data regarding sleep variables in professional Mixed Martial Arts (MMA) athletes. These sleep performance measures were related to physical performance and injury in MMA athletes. Eight professional athletes were placed into a quasi-controlled, multivariable fight-camp environment for a six-week period in preparation for fight competition. Throughout a six-week fight camp environment, athletes were continuously monitored for sleep performance measures (sleep latency, sleep efficiency, onset, and wake variances) via validated wearable sleep monitoring technology. Athletes were tested seven days prior to competition on measures of physical performance (vertical jump, VO2max, heart rate recovery, prowler sled push, and pull-ups). Multiple correlational analyses were utilized to assess relationships between all sleep and physical performance measures. There were significant (P < 0.05) correlations between sleep latency and VO2max, heart rate recovery, prowler sled push, vertical jump, and missed practice sessions. There were also significant (P < 0.05) correlations between average fall asleep time and heart rate recovery. Lastly, there were significant (P < 0.05) correlations between sleep efficiency, heart rate recovery, and missed practice sessions. MMA athletes who exhibited consistency in sleep demonstrated stronger relationships with performance testing during the fight-camp period.

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