Acta Universitatis Palackianae Olomucensis. Gymnica, 2013 (vol. 43), issue 1

The correlation between isokinetic strength of knee extensors and vertical jump performance in adolescent soccer players in an annual training cycle

Michal Lehnert, Zdeněk Svoboda, Roman Cuberek

Acta Univ. Palacki. Olomuc., Gymn. 2013 43(1): 7-15 | DOI: 10.5507/ag.2013.001

Background: Isokinetic testing is often used to provide coaches with important information about the physical status of athletes. Therefore, a number of studies focused on the assessment of the relationship between isokinetic and functional tests including soccer. The results of a limited number of studies indicate that the relationship changes in different training periods. Objective: The aim of the study was to determine the relationship between the characteristics of the isokinetic strength of knee extensors and vertical jump performance in three different periods of the annual training cycle in adolescent soccer players. Methods:...

Kinematic analysis of "Lou Yun" vaults performed by top level male gymnasts: Relationship between kinematic variables and judges' score

Roman Farana, Jaroslav Uchytil, David Zahradník, Daniel Jandačka

Acta Univ. Palacki. Olomuc., Gymn. 2013 43(1): 17-25 | DOI: 10.5507/ag.2013.002

Background: In gymnastics judging, evaluation of routines in their execution is based on form and technique displayed during the performance. A vaulting performance takes a short time and is affected by the quantity of biomechanical variables. The significant relationships between the vault score and specific aspects of the gymnast's vault should motivate coaches to monitor these variables as a part of training or routine testing. Objective: The purpose of the study was to determine the biomechanical variables that are related to a successful performance of Lou Yun vaults performed by top level male gymnasts during the World Cup competition....

Relative age effect in junior tennis (male)

Adrián Agricola, Jiří Zháněl, Ondřej Hubáček

Acta Univ. Palacki. Olomuc., Gymn. 2013 43(1): 27-33 | DOI: 10.5507/ag.2013.003

Background: The issues of the age effect (the theory of the age influence) have been shown in sport sciences since the 1980s. The theory of age effect works on the assumption that athletes born in the beginning of a calendar year are, particularly in children's and junior age, more successful than athletes born in the end of the year. This fact has been proved by a number of research studies, mainly in ice hockey, soccer, and tennis but also in other sports. Objective: The submitted contribution is aimed at verifying of the age effect in junior tennis. The research objective was to find out the distribution of birth date frequencies...

Reliability of V sit-and-reach test used for flexibility self-assessment in females

Roman Cuberek, Iva Machová, Michaela Lipenská

Acta Univ. Palacki. Olomuc., Gymn. 2013 43(1): 35-39 | DOI: 10.5507/ag.2013.004

Background: The V sit-and-reach (VSR) test seems to be an appropriate instrument of self-assessment of hamstring and low-back flexibility for its ease of execution and the need for only a small amount of materials, space, and examination skill requirements. It is assumed that the specificity of self-assessment (in general) can be the cause of other sources of measurement error. Objective: This study aimed to analyze reliability of VSR when used as an instrument of self-assessment of flexibility in adolescent females. Methods: The sample comprised 43 students (female; age 21.2 ± 0.5 years) from Palacký University in Olomouc...

Increase of the effectiveness of school PE classes through sport preferences survey: Contextual prediction of demanded sport activities

Michal Kudláček

Acta Univ. Palacki. Olomuc., Gymn. 2013 43(1): 41-48 | DOI: 10.5507/ag.2013.005

Background: An effort to promote participation in any type of PA is more effective when it is aimed at needs, interests and preferences of particular target group. Current evidence emphasizes the insufficiency of PA in all age groups. Objective: The purpose of the study was to analyze and describe the structure of sport activity preferences of high school students and to contribute to prospective improvement of sports and physical activity programs. Methods: Two standardized questionnaires were used - 1. sport preferences questionnaire, 2. international physical activity questionnaire (IPAQ). The research sample (N = 333) consisted...

Decrease in weekend number of steps in adolescents

Jana Vašíčková, Karel Frömel, Dorota Groffik, František Chmelík

Acta Univ. Palacki. Olomuc., Gymn. 2013 43(1): 49-55 | DOI: 10.5507/ag.2013.006

Background: The activities with which young people spend the weekends do not support the prevalence of an active and healthy lifestyle enough. There are research evidence-based results that physical activity performed during weekend days is lower than physical activity in weekdays. Objective: This study aims to find out to what extent young people achieve recommended levels of physical activity on weekends and to identify possible differences with regard to nationality or gender. Methods: Research was realised between 2008 and 2011 at randomly selected schools in the Czech Republic and in Poland. The week long step count monitoring...