The aim of this research was to establish the relation between maximal isometric force and different indicators of isometric explosive force of leg extensors (iRFD). The sample consisted of 83 participants divided into 2 groups in terms of gender, males N=53 and females N=30. In order to assess the characteristics of the F-t isometric leg extensor force, tensiometric probes and the standardized "seated leg extension" test were used. The measurement range was defined by 6 variables for the contractile characteristics of the leg extensor isometric muscle force - 1) the level of achieved maximal force - FmaxLEGEXTISO, 2) the indicator of the basic (general) level of rate of force development - RFDBASICLEGEXTISO, 3) the indicator of the specific level of rate of force development - RFD50%LEGEXTISO, and three indicators for evaluating the special level of the explosive force development, i.e. leg extensor explosiveness, 4) measured at 250ms - RFD250msLEGEXTISO, 5) measured at 180ms - RFD180msLEGEXTISO, 6) measured at 100ms - RFD100msLEGEXTISO. The results of the linear regression in the males showed a positive correlation between FmaxLEGEXTISO and RFD50%LEGEXTISO F=16.298, p=0.000; and RFD250msLEGEXTISO F=40.754, p=0.000; and RFD180msLEGEXTISO F=18.660, p=0.000; and RFD100msLEGEXTISO F=5.430, p=0.024; in the females with RFDBASICLEGEXTISO F=10.099, p=0.004; with RFD50%LEGEXTISO F=13.585, p=0.001; with RFD250msLEGEXTISO F=35.469, p=0.000; with RFD180msLEGEXTISO F=14.698, p=0.001. The results of this study showed that the combination of the maximal exertion method, with the aim of developing maximal force or strength, and plyometrics, with the aim of developing the intensity of contraction in its different phases, from the aspect of training technology, is absolutely advisable and reasonable. This may have important practical implications when designing resistance training programs for specific sportsdeling. Key words: isometric muscle force, rate of force development, relation, leg extensors
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