Determining parameters of serve variability in qualified volleyball players
Keywords:
serve variability, parameters, qualified volleyball players.Abstract
Objective of the study is to identify the determining parameters of serve variability in qualified volleyball players.
Methods and structure of the study. In the course of the examination the following parameters were assessed: dynamometry data, the accuracy of the differentiation of muscular efforts and the magnitude of their deviation from the calculated value, the coefficients of agility in running and in jumping, the ability to discriminate time intervals, and also the endurance of the nervous system and its capacity to switch to movements performed at different speeds. The effectiveness of the serve was determined with account taken of the method of execution (serve for accuracy, serve for power, ‘hybrid’ serve). Ten games of leading teams were processed using the professional software Data Volley 4Pro. The objects of the study were 12 male athletes with the qualifications of Candidate for Master of Sport and Master of Sport, participants in the Russian volleyball championship.
Results and conclusions. 1. It was established that in the serve for accuracy the leading parameters are the differentiation of muscular effort (25 % and 50 % of maximum) and the discrimination of time intervals (10 and 30 seconds). 2. It was determined that in the serve for power the determining indicators are the coefficient of agility in jumping, the level of endurance of the nervous system and its capacity to switch to movements at different speeds. 3. It was revealed that in the hybrid serve the determining parameters are jumping agility, maximum hand strength, the accurate discrimination of time intervals (10, 30 and 60 seconds), the differentiation of muscular effort (75 % of maximum), and high values of the endurance of the nervous system and of its capacity to switch between movements at different speeds.
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