The basic aim of this research is to changes and difference in changes of manifested motor abilities under influence of application of isometric and isotonic operators. On the samples of 216 male examinees 15 years of age, which were sorted into groups A, B and C kinesiologic contents operators were applied. In group A, applied were isometric operators, in group B isotonic operators and in group C which were control group, applied were poly-structural operators of complex motion. In course of three months research, examinee shad weekly three trainings and other days remained for rest. Duration of one training were 60 min. Operating context in experimental group were identical in biomechanics base structure. Form of work which were used were cells system and circle working method. Volume end distribution of applied operators were individually programmed based on initial state, taking 70% of maximal duration valuation or repeating number in each operator. Progressive discontinued duration or operators performance numbers were programmed from initial state through transitive until final state. Examinees motor abilities were determined by use of measuring instruments. Measuring were effected at the beginning, middle and end of examination and were than analysed. Groups of first, second and third measure were analysed through variance analyse and according to importance of group differences, tests were made of differences of arithmetic centres. Motor abilities initial state had very important changes, depending on type of applied operators. Applied isometric operators, in comparison to applied isotonic operators under identical conditions were more important in development of motor abilities, static strength, speed, flexibility and coordination.
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