Acta Gymnica, 2018 (vol. 48), issue 3
Concurrent validity of Myotest for assessing explosive strength indicators in countermovement jump
Vladimír Hojka, James J. Tufano, Tomáš Malý, Petr Šťastný, Radim Jebavý, Jan Feher, František Zahálka, Tomáš Gryc
Acta Gymnica 2018, 48(3):95-102 | DOI: 10.5507/ag.2018.013 
Background: Previous research has determined the validity and reliability of accelerometer-based devices, but the findings are not consistent. Objective: The purpose of this study was to determine the validity of an accelerometer (Myotest PRO) for measuring explosive strength indicators (jump height, peak force, peak velocity, and peak power) during the countermovement jump. Methods: Thirty-three university students (22 males and 11 females; 178.6 ± 5.6 cm, 69.3 ± 6.5 kg, 21.8 ± 1.7 years) performed five individual countermovement jumps. Jump height was derived from an accelerometer (Myotest, frequency 200 Hz), optic timing system...
The effect of task-relevant and task-irrelevant attentional cues and skill level on performance and knee kinematics of standing long jump
Ayoub Asadi, Esmaeel Saemi, Mahmoud Sheikh, Mehdi Takhtaei
Acta Gymnica 2018, 48(3):103-108 | DOI: 10.5507/ag.2018.015
Background: Attention is one of the brain's most crucial cognitive functions playing a key role in performing motor skills. Objective: The purpose of the present study was to investigate the effect of task-relevant and task-irrelevant attentional cues and skill level on performance and knee kinematics of standing long jump. Methods: Fifteen skilled (volleyball and basketball players) and fifteen novices (aged 19 to 27 years) were recruited. The task was the standing long jump test which was executed 9 times under 3 conditions (3 trials per condition). Participants in the control condition did not receive any attentional instruction. In task-relevant...
Self-evaluation of body image in sport active and sport inactive adolescent girls
Janka Peráčková, Alžbeta Chovancová, Klaudia Kukurová, Lucia Plevková
Acta Gymnica 2018, 48(3):109-114 | DOI: 10.5507/ag.2018.014
Background: Body image is the mental representation one creates about one's self and is in relation how others see him/her. In the scientific literature, there is a lack of knowledge concerning differences in self-evaluation of body image in sport active and sport inactive adolescent girls. Objective: The aim of this study was to investigate satisfaction or dissatisfaction in an individual attitudinal disposition toward the physical self-body image perception with regards to the level of physical activity (sport active and sport inactive) of adolescent girls in two dispositional dimensions: evaluation and orientation for three somatic domains of appearance,...
Vertical jump development in elite adolescent volleyball players: Effects of sex and age
Mája Polakovičová, Miroslav Vavák, Róbert Ollé, Michal Lehnert, Martin Sigmund
Acta Gymnica 2018, 48(3):115-120 | DOI: 10.5507/ag.2018.016
Background: Vertical jump is one of the most prevalent activities performed in volleyball. During adolescence, boys and girls undergo substantial changes in physiological and anthropometric characteristics that influence vertical jump performance. Objective: The purpose of this study was to examine and quantify sex and age-related differences in vertical jump performance assessed as vertical jumps height (VJH) and ground contact time (Tc) during repeated vertical jump tests within the Czech and Slovak population of elite adolescent volleyball players. Further aims were to compare the obtained results to non-athletic adolescent national normative...
"Voice of Children": Qualitative analysis of children's interpretations regarding nutritional behaviour
Eliška Štefanová, Tibor Baška, Zuzana Boberová, Daniela Husárová, Zuzana Dankulincová Veselská, Henrieta Hudečková
Acta Gymnica 2018, 48(3):121-129 | DOI: 10.5507/ag.2018.017
Background: Understanding opinions, attitudes and knowledge of schoolchildren regarding eating habits is essential to develop effective preventive measures in this target group. Objective: The aim of the study was to find opinions and attitudes of schoolchildren regarding nutrition and related behaviour. Methods: Data were collected in selected elementary schools from April to June 2015. Pupils of 5th (7 girls, 7 boys), 7th (4 girls, 4 boys) and 9th (8 girls, 10 boys) grades debated their opinions and attitudes regarding eating habits during sessions in classrooms and recorded them into worksheets. Qualitative content analysis of the obtained data...
Self-confidence, commitment and goal-setting in Czech athletes at different performance levels
Michal Vičar
Acta Gymnica 2018, 48(3):130-137 | DOI: 10.5507/ag.2018.018
Background: Numerous studies rank self-confidence, commitment and goal-setting among the foundation mental skills in athletes, conditioning the development of elite performance and also contributing to achieving first rate results during competition. Their quality is, therefore, essential for top performance. Objective: The goal of this study is a comparison of self-confidence, commitment and goal-setting in Czech athletes performing at different performance levels. The secondary aim is to compare the values gathered in Canadian and Czech populations. Methods: The Czech version of the OMSAT-3* questionnaire was distributed to 241 athletes at regional...