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1145 R, Katie et al,: Motor Abilities for Athletics in First-Graders, Coll, Antropol, 32 (2008) 4: 1141-1147 treatments for the respective age group^ '^ "'^ '*"^ .^ An in- crease in aerobic endurance provides a basis for the de- velopment of a number of other motor abilities that also rely on the development of the oxygen transport system, thus being the main goal of any training process, A higher capacity of the oxygen transport system has a sub- stantial impact on the flow of information and optimal motion performEince, and thus on higher ability achieve- ments. In the present study, linear combinations were estab- lished between the predictors (the variables of basic motoricity) and the criteria (the veiriables assessing per- formance in athletics) on initial measurement (at the be- ginning of the elementary school first grade) and final measurement (at the end of the elementary school first grade), followed by establishment of linear combinations between the predictor and criterion variables in the vari- ables of differences (final vs. initial measurement). In this way, inter-determination of the sets of variables for a particular state (point of measurement) was established, i,e, the mechanisms responsible for the association of the sets of variables for a particular state were identified, while the relations of the variables between differences in the sets of variables identified mechanisms responsi- ble for alterations in the structure of linear combinations of the sets of variables between these variables at partic- ular points of measurement. These analyses were done for either sex in separate, thus enabling comparison, i,e, establishment of sex specificities in the development of functions that determine the association of basic motor abilities with situation motor abilities in athletics, Male children: • on initial measurement, the mechanism of the inten- sity of energy mobilization, i,e, the mechanism of force regulation, which in part includes the mechanism of si- multaneous information processing in terms of syner- gistic movement regulation and coordination and the mechanism of successive information processing in terms of movement frequency of the trunk and upper extremities, was primarily responsible for the general association of the sets of variables. The mechanism thus described is predominantly present in sprint, to a lesser extent in throwing, and to the least extent in middle-distance run; • on final measurement, the mechanism regulating all strength factors was responsible for the generad associ- ation of the sets of variables, i,e, the first pair of canonic dimensions, with a predominance of explosive strength (the intensity of energy mobilization), to so- me extent accompanied by muscle tone regulation and coordination. The mechanism thus described mostly influenced performance in sprint, to a lesser extent in throwing, while exerting least influence on middle-dis- tance run. The second linear combination juxtaposes two mechanisms, i,e, the mechanism integrating mus- cle tone regulation, lower extremity movement fre- quency and muscle endurance to achieve above-aver- age results in middle-distance run, and the mechanism integrating synergistic regulation, explosive strength. coordination and explosive strength of the trunk to achieve above-average results in throwing; and • the relations of the variables of differences in the sets of variables between the two points of measurement produced the factors of changes and/or processes that had led to alterations in the structure of linear combi- nations on final measurement as compared with initial measurement. The first factor of changes referred to the development of endurance, aerobic and muscle, i,e, the mechanism responsible for the duration of energy mobilization, whereas the second factor of changes was responsible for the regulation of force, i,e, intensity of energy mobilization. Female children: • on initial measurement, the mechanism of energy reg- ulation of movement, primarily in terms of the inten- sity of energy mobilization, and the mechanism of speed regulation in terms of movement frequency were responsible for the general association of the sets of variables. The motor system thus descrihed deter- mines general performance in athletics (sprint, throw- ing and middle-distance run). The second pair of ca- nonic dimensions juxtaposes the mechanism of force regulation that predominates in sprint and the mecha- nism of speed regulation (successive information pro- cessing) that is important in middle-distance run; • on final measurement, general association of the sets of variables was found to be determined by the effects of the mechanism of energy regulation of movement in terms of duration and intensity of energy mobilization, and the mechanism of speed regulation in terms of lower extremity movement frequency in sprint, then in throwing, and to the least extent in middle-distance run; • in female children, the processes that had led to chan- ges in the structure of linear combinations on final measurement as compared with initial measurement were defined by the development of the mechanisms of energy regulation of movement, predominantly in terms of muscle endurance, which was accompanied hy the development of muscle tone regulation as a basis of better performance in middle-distance run (aerobic en- durance), then in throwing and sprint. Comparison of the results obtained in male and fe- male children revealed sex differences in the motor and specific motor functions, which were found to develop at a faster rate in femede children, thus resulting in earlier formation of optimal linear combinations of the basic motor abilities and specific motor abilities for athletic events in female than in male subjects^" '^^ °'^ ^ Upon com- pletion of the motor ability differentiation at the begin- ning of the elementary school first grade (through two canonic variables), along with the process of homogeni- zation at the end of the elementary school first grade, one canonic factor was formed in femade children, as op- posed to two canonic factors formed in male children only through the process of motor ability differentiation at the end of the elementary school first grade, Con- 1146 R. Katie et al.: Motor Abilities for Athletics in First-Graders, Coll. 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