Effects of Jet Lag on Factors Related to Sport Performance

1993 ◽  
Vol 18 (1) ◽  
pp. 91-103 ◽  
Author(s):  
David W. Hill ◽  
Corinne M. Hill ◽  
Kelly L. Fields ◽  
Jimmy C. Smith
Keyword(s):  
Western Europe ◽  
Mood State ◽  
Anaerobic Power ◽  
Anaerobic Capacity ◽  
Dynamic Strength ◽  
Work Capacity ◽  
Sport Performance ◽  
Jet Lag ◽  
The Usa ◽  
Key Words Circadian

Three studies were performed to evaluate the effects of jet lag on factors associated with sport performance. In Study 1, members of the USA Women's Soccer Team traveled to Taiwan; in Study 2, North American students and faculty traveled to Western Europe; and in Study 3, European students traveled to North America. After travel, there was disruption of mood state and a reduction in dynamic strength; peak 5-s power and 30-s work capacity were reduced for 2 days (5-s power: 9.8 vs. 9.0 vs. 9.0 W∙kg−1; 30-s work capacity: 213 vs. 199 vs. 201 J∙kg−1). In these studies, mood state, anaerobic power and capacity, and dynamic strength were affected by rapid transmeridianal travel, and even highly trained athletes suffered from jet lag. However, effects of travel on the variables tested were essentially eliminated after 3 or 4 days. Key words: circadian rhythm, anaerobic power, anaerobic capacity, mood, travel

scholarly journals Motivation and motoric tests in sports

2007 ◽  
Vol 60 (5-6) ◽  
pp. 231-236 ◽  
Author(s):  
Dea Karaba-Jakovljevic ◽  
Jelena Popadic-Gacesa ◽  
Nikola Grujic ◽  
Otto Barak ◽  
Miodrag Drapsin
Keyword(s):  
Achievement Motivation ◽  
Sport Activity ◽  
Anaerobic Power ◽  
Anaerobic Capacity ◽  
Sport Performance ◽  
Wingate Anaerobic Test ◽  
Sport Activities ◽  
Novi Sad ◽  
Verbal Encouragement ◽  
Anaerobic Test

Motivation in sport performance has been an interesting topic for many investigators during the past decade. This area can be considered from different viewpoints: motivation for participation in sport activity, achievement motivation, competitiveness etc. Motivation plays an important role in all out tests, as well as in sport activities and at all levels of competition. Motivation climate, or positive social environment may influence and modulate motivation of individuals involved in sports. Experience has shown that conventional encouragement and feedback during the test may affect its outcome. According to Wingate research team recommendations, verbal encouragement, as a motivation factor, was given to all examined subjects during Wingate anaerobic test, which is considered the most reliable test for assessing anaerobic capacity. The investigated group consisted of 30 young men - medical students, who were not actively involved in any programmed sport activity. The investigated group included second-year students of the Faculty of Medicine in Novi Sad chosen by random sampling. The Wingate anaerobic test was performed in all subjects, and changes of parameters when test was performed with verbal encouragement, were recorded. The results show statistically significant increase of Wingate test parameters when conducted with verbal encouragement: anaerobic power (622/669 W); relative anaerobic power (7.70/8.27 W/kg); slope of the power (95.5/114 W/s); relative slope of the power (1.18/1.40 W/s/kg); anaerobic capacity (12.7/13.2 kJ) and relative anaerobic capacity (158/164 J/kg).

scholarly journals Identification of success factors in elite wrestlers—An exploratory study

PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0247565
Author(s):  
Igor Cieśliński ◽  
Dariusz Gierczuk ◽  
Jerzy Sadowski
Keyword(s):  
Response Time ◽  
Random Forests ◽  
Success Factors ◽  
Anaerobic Power ◽  
Anaerobic Capacity ◽  
Dynamic Strength ◽  
Standing Position ◽  
Weight Class ◽  
Specific Training ◽  
Practical Standpoint

Identification of success factors in wrestling as well as establishing their hierarchy are crucial from a cognitive and practical standpoint. It may provide a lot of practical recommendations related to wrestling-specific training. The aim of this study was to identify and establish the hierarchy of success factors in wrestling regardless of a fighting style and weight class. This study included 168 elite male freestyle and Greco-Roman wrestlers. They were divided into two groups: athletes who won medals (successful wrestlers) in high-rank competitions (Polish Championships or higher) and those who did not win any medals (less successful wrestlers) in those competitions. The following elements were assessed: anthropological measurements, body composition, dynamic strength, strength endurance, agility, special endurance, wrestling-specific fitness, response time, technical wrestling skills and anaerobic capacity. For initial data analysis, one-way ANOVA (α = 0.005) was used. Random Forests classifier was employed to identify success factors and to determine the importance of each of these factors in terms of sports performance. Seven key success factors were identified: anaerobic power, strength endurance, response time, special endurance, wrestling-specific fitness and technical wrestling skills performed in a horizontal position. Random Forests turned out to be an effective method of modelling success in wrestling (compared to SVM and KNN, which were also used in the study). These findings suggest that wrestling-specific training can be effectively monitored by controlling several vital indicators of athletes’ preparedness: anaerobic power, strength endurance, response time, special endurance, wrestling-specific fitness and technical wrestling skills (the performance of reverse waistlock from a standing position and trunk grip gut wrench assessed by experts).

EPIZOOTOLOGICAL FEATURES OF MODERN CATTLE LEUKEMIA

1970 ◽  
pp. 53-58
Author(s):  
V. V. Makarov ◽  
D. A. Lozovoy
Keyword(s):  
Dairy Cattle ◽  
Western Europe ◽  
Control Programs ◽  
Foreign Countries ◽  
Negative Order ◽  
Dairy Cattle Breeding ◽  
The Usa ◽  
Epizootic Process ◽  
National Programs

  Enzootic bovine leucosis (EBL) has been known for more than a century and a half. Its occurrence and registration may have historically been associated with intensive breeding of dairy cattle in Western Europe to increase target productivity. It is known that any limiting intervention in the nature of the animal organism is always accompanied by an uncontrolled and unpredictable change in the genotype of a wider range than the required, particularly negative order. In particular, a decrease in the resistance to macroorganisms and the possibility of the new diseases emergence, including infectious ones (for example, immunodeficiencies such as BLAD syndrome of black-motley cattle and stress syndrome in pigs, the occurrence of scrapie and other slow sheep infections). In the last two decades of the last century, in many disadvantaged countries, primarily Western European, national programs for the eradication of EBL have been developed and subsequently successfully implemented. First of all the motivation was the economy of dairy cattle breeding (mainly the extension of productive age, as well as the tightening of requirements in international trade in cattle and bull products, breeding, pricing, etc.). In an analytical article are reviewed the elements of epizootology of EBL in the foreign countries with special attention to the situation in the USA, scenarios of various control programs, and promising methods for assessing the role of infected animals in the epizootic process. A critical assessment of the problem of EBL in the Russian Federation is given, the reasons for the ineffectiveness of against leucosis measures are discussed.

Concept of Power Decentralization in Political Science and Approaches to its Methodological Study

2017 ◽  
pp. 229-235
Author(s):  
Halyna Kuzub
Keyword(s):  
Political Science ◽  
Moral Education ◽  
Symbolic Interactionism ◽  
Western Europe ◽  
Central Government ◽  
Local Level ◽  
Perfect State ◽  
Political Ideas ◽  
The Usa ◽  
Structural Functionalism

The problem of power decentralization is up to date in a modern political science. We can trace its historical genesis first in European and further in the USA political ideas. Decentralization of power was considered along with the study of a perfect state system, civil society and local self-government. It is argued that the major part of successful process of power decentralization in the Western Europe was due to the idea nature for their political culture. The article attempts to retrace the history of the idea of power decentralization. As a background of the investigations of such thinkers as J. Bodin, J. Althusius, J. Locke, J.-J. Rousseau, C.-L. Montesquieu, R. Owen, C. Fourier, J. S.Mill, T. Jefferson, A. de Tocqueville and M. Dragomanov were thoroughly investigated. The paper also considers the modern definitions of power decentralization. Likewise the value of structural functionalism, symbolic interactionism and constructivism are argued in terms of further surveys of power decentralization. To conclude, the author opines that civil servants training, their theoretical teaching and moral education have to become the main objectives in perspective investigations. Furthermore, the success of power decentralization depends not only on devoting authority by central government, but also on capacity of its implementation by deputies on the local level. Keywords: Decentralization of power, deconcentration of power, administrative and political decentralization, classical and non-classical philosophy, structural functionalism, symbolic interactionism, construc-tivism

scholarly journals “A debriefer must be neutral” and other debriefing myths: a systemic inquiry-based qualitative study of taken-for-granted beliefs about clinical post-event debriefing

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Julia Carolin Seelandt ◽  
Katie Walker ◽  
Michaela Kolbe
Keyword(s):  
Interpersonal Relationships ◽  
Western Europe ◽  
Ad Hoc ◽  
Scientific Evidence ◽  
Clinical Event ◽  
Clinical Settings ◽  
Healthcare Organizations ◽  
The Usa ◽  
Open Coding ◽  
Healthcare Administrators

Abstract Background The goal of this study was to identify taken-for-granted beliefs and assumptions about use, costs, and facilitation of post-event debriefing. These myths prevent the ubiquitous uptake of post-event debriefing in clinical units, and therefore the identification of process, teamwork, and latent safety threats that lead to medical error. By naming these false barriers and assumptions, the authors believe that clinical event debriefing can be implemented more broadly. Methods We interviewed an international sample of 37 clinicians, educators, scholars, researchers, and healthcare administrators from hospitals, universities, and healthcare organizations in Western Europe and the USA, who had a broad range of debriefing experience. We adopted a systemic-constructivist approach that aimed at exploring in-depth assumptions about debriefing beyond obvious constraints such as time and logistics and focused on interpersonal relationships within organizations. Using circular questions, we intended to uncover new and tacit knowledge about barriers and facilitators of regular clinical debriefings. All interviews were transcribed and analyzed following a comprehensive process of inductive open coding. Results In total, 1508.62 min of interviews (25 h, 9 min, and 2 s) were analyzed, and 1591 answers were categorized. Many implicit debriefing theories reflected current scientific evidence, particularly with respect to debriefing value and topics, the complexity and difficulty of facilitation, the importance of structuring the debriefing and engaging in reflective practice to advance debriefing skills. We also identified four debriefing myths which may prevent post-event debriefing from being implemented in clinical units. Conclusion The debriefing myths include (1) debriefing only when disaster strikes, (2) debriefing is a luxury, (3) senior clinicians should determine debriefing content, and (4) debriefers must be neutral and nonjudgmental. These myths offer valuable insights into why current debriefing practices are ad hoc and not embedded into daily unit practices. They may help ignite a renewed momentum into the implementation of post-event debriefing in clinical settings.

scholarly journals Morphophysiological and molecular characterization of millet (Panicum miliaceum L.) varieties for crop improvement in Western Europe

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Massimo Vischi ◽  
Nicola Zorzin ◽  
Maria Bernhart ◽  
Johanna Winkler ◽  
Dipak Santra ◽  
...  
Keyword(s):  
Western Europe ◽  
Crop Improvement ◽  
Genetic Distances ◽  
Phenotypic Traits ◽  
Panicum Miliaceum ◽  
Novel Foods ◽  
Proso Millet ◽  
Ne Italy ◽  
The Usa

Abstract Background Global warming and issues in favour of a more sustainable agriculture suggest a reconsideration of minor cereals in European agrosystems. Compared to other summer crops, proso millet has a remarkable drought resistance and could be used to improve crop rotation and biodiversity. Proso millet is also increasingly sought by industry to produce novel foods such as those designed for coeliac patients. In this study, a thorough characterization of 11, commercially available, proso millet (Panicum miliaceum L.) varieties was carried out as a preliminary step for crop reintroduction and breeding in Western Europe. Methods The cultivars under evaluation were introduced from Austria, Poland, Russia, and the USA (University of Nebraska–Lincoln). Plants were grown at Udine (NE Italy) and Gleisdorf (Styria, Austria), under greenhouse and field conditions, respectively. Yield components and a range of morphophysiological characters were recorded in both locations. In parallel, 85 SSR markers were tested on DNA samples extracted from randomly chosen plants of each variety and the 12 responsive markers used to genotype the whole variety set. Results Morphometric analyses showed that varieties have several diverging phenotypic traits and architectures. In all instances, yields recorded at field level were much lower than potential yields. In this respect, US selections were comparable to earlier developed European varieties, suggesting that breeding for an increased adaptation is the keystone for a stable reintroduction of millet in Western Europe. Molecular analyses uncovered remarkably low genetic differences and heterozygosity levels within cultivars, confirming millet as an essentially autogamous species; in contrast, large genetic distances were noted among cultivars selected in different environments. Results of SSR genotyping combined with those originating from phenotypic analyses indicated possible crosses to source the genetic variability necessary for selection. Conclusions This study enabled the identification of cultivars that could be used to revitalize the crop in Western Europe and to produce genetically variable hybrid progenies exploitable by breeding.

scholarly journals Anaerobic Strength and Power in Master Athletes

2017 ◽  
Vol 01 (01) ◽  
pp. E30-E36 ◽  
Author(s):  
Jelena Gacesa
Keyword(s):  
Anaerobic Power ◽  
Anaerobic Capacity ◽  
Knee Extensors ◽  
Master Athletes ◽  
Wingate Anaerobic Test ◽  
Male Athletes ◽  
Group Iii ◽  
Contraction Velocity ◽  
Group I ◽  
Group Ii

AbstractThe study compared anaerobic capacity and power in master athletes of different ages, and correlated 2 different anaerobic tests. The study was conducted on 60 male athletes: group I 30–35 years (n1=35, age 32.23±1.53 y), group II 35–45 years (n2=15, age 39.17±3.60 y), group III above 46 years (n3=10, age 52.13±4.50 y). The Wingate anaerobic test and ergometry of elbow flexors, elbow extensors, and knee extensors were performed. Average peak anaerobic power (PP) in group I was 692.94±216.53 W, in group II 593.40±185.91 W, non-significantly lower by 14.4% (p>0.05). In group III, PP was 381.50±117.62 W, significantly lower by 44.9% when compared with group I (p≤0.001). Ergometry parameter of muscle strength and power showed greater decline with age (up to 32.3%) in comparison with contraction velocity (up to 14.1%). Significant correlation was registered between PP and ergometric parameter power for knee extensors (KE) (PP/KE power: r was 0.59 in group I, 0.85 in group II, and 0.90 in group III, p≤0.05). Master athletes represent an interesting population for studying the chronic effects of physical activity on functional capacity changes during ageing. Strength parameters “age” in different fashion, because the contraction velocity parameter is less influenced than strength by the muscle alterations with increasing age.

scholarly journals Editorial: Practical implications of governance and regulation

2021 ◽  
Vol 10 (2, special issue) ◽  
pp. 192-194
Author(s):  
Branka Mraović
Keyword(s):  
Western Europe ◽  
Good Governance ◽  
Special Issue ◽  
The Balkans ◽  
Regulatory Frameworks ◽  
Governance Practices ◽  
The Usa ◽  
Market Opportunities ◽  
Written Word ◽  
Practical Implications

The authors of papers in this special issue of the Journal of Governance and Regulation come from different parts of the world such as West and South Africa, South and Southeast Asia, the Middle East, the Balkans, Western Europe, and the USA, and offer interesting, vivid and educational experiences how countries with different economic, political, cultural and regulatory frameworks deal with global challenges, testifying that the universalism of science and good governance practices transcend geopolitical conflicts and divisions. Each of these papers sheds light on some aspect of governance and provides financiers, investors, regulators, scientists, managers, professionals, students, and other interested readers with useful insights into the market opportunities and challenges of developing countries. The practical implications of these academically written papers are supported by a solid research methodology that ensures the credibility of the written word and calls for new empirical verifications.

scholarly journals Geography of international migration in the modern age of globalization

2019 ◽  
pp. 31-40 ◽  
Author(s):  
L. M. Sintserov
Keyword(s):  
Developing Countries ◽  
International Migration ◽  
Western Europe ◽  
Sustainable Growth ◽  
World Population ◽  
Financial Flows ◽  
Global Migration ◽  
The World ◽  
The Usa ◽  
International Migrants

The article deals with international migration during the last decades of the 20th and at the beginning of the 21st centuries and its economic-geographical analysis. The paper provides an overview of opinions about the dating of the contemporary era of global migration. It is shown that only after completion of spatial restructuring of migration processes and with the transition to sustainable growth of the share of international migrants in the world population, the modern increase of migration begins. On the basis of the UN statistics the main sources of migrants to the countries of Western Europe have been determined as well as shifts in the geographical structure of migrant population of the region that have taken place in the last quarter of a century. Two migration waves directed to the core of the European region from its southern and then from the eastern periphery are determined. The transformation of the USA population structure caused by the migration inflow from Latin America and Asia is described. The ratio of the main directions of global migration is shown: South-South, South-North, etc. At the same time, it is noted that a rather limited part of international migrations is associated with the asynchrony of demographic processes in the regions of the world. The article also discusses the remittances of migrants from developing countries to their homeland, forming powerful financial flows, which are second only to foreign direct investment. They play an especially important role in the economies of developing countries. The calculations show that the contribution of international migrants to the world economy far exceeds their share in the world population.

scholarly journals The 2010 Structural-Demographic Forecast for the 2010–2020 Decade: A Retrospective Assessment

2020 ◽  
Author(s):  
Peter Turchin ◽  
Andrey Korotayev
Keyword(s):  
Western Europe ◽  
Time Series Data ◽  
Political Instability ◽  
The United States ◽  
Stress Index ◽  
Series Data ◽  
Strongly Correlated ◽  
Retrospective Assessment ◽  
The United Kingdom ◽  
The Usa

This article revisits the prediction, made in 2010, that the 2010–2020 decade would likely be a period of growing instability in the United States and Western Europe (Turchin 2010). This prediction was based on a computational model that quantified in the USA such structural-demographic forces for instability as popular immiseration, intraelite competition, and state weakness prior to 2010. Using these trends as inputs, the model calculated and projected forward in time the Political Stress Index, which in the past was strongly correlated with socio-political instability. Ortmans et al. (2017) conducted a similar structural-demographic study for the United Kingdom and obtained similar results. Here we use the Cross-National Time-Series Data Archive for the US, UK, and Western European countries to assess these structural-demographic predictions. We find that such measures of socio-political instability as anti-government demonstrations and riots increased dramatically during the 2010–2020 decade in all of these countries.

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