IMPORTANCE OF CARDIORESPIRATORY ENDURANCE IN MALE HANDBALL PLAYERS

Abstract Team handball is a complex game which requires a series of different abilities while the fact that different players’ positions in the field require different characteristics and abilities hinders the defining of the morphofunctional model of ideal handball player. Unlike the anthropomorphological profile, the functional model of handball player is not even close to be clearly defined. The basis for assessing the optimal level of cardiorespiratory endurance in handball players is to define the duration of certain levels of load during a handball match and also a physiological requirements that the player needs to fulfill. The level of cardiorespiratory (aerobic) endurance plays an important role in inducing and controlling the desirable physiological adaptations during a training process. Previous scientific results indicate that the cardiorespiratory endurance does not represent a limiting factor for high performance of handball players during the competition. However, a good aerobic preparation allows efficient process of recovery during the period between high intensity activities. Knowing the individual cardiorespiratory endurance of handball players is the foundation for enhancing their abilities and competition results by means of sports training.   Keywords: team handball, cardiorespiratory endurance, adaptation, training

VARIATIONS OF MUSCULAR STRENGTH AND POWER IN MALE HANDBALL PLAYERS DURING AN ENTIRE SEASON

Competition performance in handball depends on various individual skills and interaction with teammates. Technical and tactical efficiency are probably the most influential factors, while physical characteristics represent the prerequisite to attaining high level of competition performance. The purpose of the study was to determine the variations of muscular strength and power in male handball players during an entire season. The study was carried out on a sample of14 male handball players, members of the handball club, the participant of the Serbian male handball league during the 2014/2015 season. Measurements were taken four times during the period between the 6th and the 18th round of the handball league. The investigation protocol consisted of anthropometric measurements, determinations of the one-repetition maximum and assessments of muscular power. The obtained data indicate that no significant variations of muscular strength and power in male handball players occur during a competitive season. Besides, this study showed that players who compete in the Serbian male handball league have similar anthropometric characteristics, but significantly lower values of muscular strength and power when compared to top level European male handball players, and that it is necessary to pay much more attention to resistance training during the preparation period. Low values of the first measurement, which was the closest to the preparation period, are the probable reason for the non-existence of major variations during the competitive season

SOCIO-ECONOMIC STATUS OF PARENTS AND THEIR CHILDREN SPORTS ENGAGEMENT

Summary. The number of overfed children, not satisfying the daily movement dose, is increasing. It is a serious problem which is to be prevented. The objective of this work is to get the insight into the level of children inclusion (engagement) in different organized sports activities, as well as to find out how the parents level o education and economic situation in the family impact that. Based on the literature search of previoussimilar studies, the results obtained may be consideredin the right way. The data processing has been made by means of Т-test and X2- test. The study covered 1630 parents of primary school children, from I to IV grade in the territory of the towns, as follows: Nis, Vranje, Knjazevac and Pirot. We covered schools both from urban and rural areas of the mentioned cities. Results achieved indicate that the increased educational level of parents and better economic situation impact the children sports engagement. Keywords: education, sports, Serbia, parents, childre

TECHNICAL PRODUCT RISK ASSESSMENT: STANDARDS, INTEGRATION IN THE ERM MODEL AND UNCERTAINTY MODELING

European Union has accomplished, through introducing New Approach to technical harmonization and standardization, a breakthrough in the field of technical products safety and in assessing their conformity, in such a manner that it integrated products safety requirements into the process of products development. This is achieved by quantifying risk levels with the aim of determining the scope of the required safety measures and systems. The theory of probability is used as a tool for modeling uncertainties in the assessment of that risk. In the last forty years are developed new mathematical theories have proven to be better at modeling uncertainty when we have not enough data about uncertainty events which is usually the case in product development. Bayesian networks based on modeling of subjective probability and Evidence networks based on Dempster-Shafer theory of belief functions proved to be an excellent tool for modeling uncertainty when we do not have enough information about all events aspect

Optimization Model for Machining Processes Design in Flexible Manufacturing Systems

Engineering machining processes realized in flexible machining systems is a highly complex task, especially since it encompasses complex optimization procedures apart from engineering. For a broad array of different workpieces produced in different series it is very difficult to engineer a manufacturing process for attaining maximum processing productivity with minimal production costs. This paper presents a developed postprocessor model enabling automatic generating of the numerical control code for all programs executed simultaneously in the production process on a greater number of machining centers. The model engrosses the different variants of tools in a machining center magazine, a different combination of elements of the machining mode, possibility of the most favorable layout of workpieces on pallets, compliance with the technological requirements in terms of simultaneous tool changes in machining center magazines, the required total processing time and minimal production costs. To that aim has been developed the postprocessor generator, as a program and software system, enabling all programs to be automatically updated based on the set up optimization strategy from tool changes, changes in cutting mode elements and technological operations. Such updated programs contain optimal technological parameters and provide minimal costs of production while at the same time the maximum utilization of tools during manufacture at an exactly specified time