MODELS OF DIFFERENT FORCE PRODUCTION MUSCLE GROUPS AND CONTROL THEREOF IN ISOMETRIC EXERTION

Ðurica Amanovic, Zarko Kostovski, Stipe Blazevic, Ana Pavic, Milija Ljubisavljevic

The research was conducted with the goal to determine the control over muscular force production in various muscle groups (knee extensors, back extensors, and arm extensors) when trying to reach the assigned force levels. Testing was performed under isometric conditions of exertion. The sample of subjects embraced 150 male students of the College of Internal Affairs in Zemun – Belgrade, Serbia. The subjects underwent 5 experimental trials each. In the first trial maximal voluntary contraction, that is maximal muscle force (FmaxIZO) was measured, whereas in the other four trials the attained force level was measured with respect to the assigned percentage of maximal force Fmax, at the levels of 30%, 50%, 70%, and 90%. The testing procedures were performed by means of hardware-software system usually utilized the Diagnostic-Prognostic Laboratory for Special Physical Education at the College of Internal Affairs. The findings indicated the total variability of the set of all utilized variables, describing the mechanisms of muscle force generation control obtained with the Belt method, had various levels of multivariate explanation, that is, the data were variously adequate with regard to force levels ranging from 30% to 90% of Fmax. The obtained functions indicate the best results in muscle force generation control aimed at reaching the assigned force level were obtained at the higher force level, whereas the subjects performed poorly in fine motor control ability manifestation, that is, the controlled force exertion at the level of 30% of Fmax was a too difficult motor task for them.

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