Association between dynamic strength index derived from isometric squat and squat jump or countermovement jump and force-velocity profile

We investigated the associations and differences between dynamic strength index (DSI) calculated from different types of vertical jump (countermovement jump; CMJ and squat jump; SJ) and different isometric knee joint angles (30, 60 and 90°), and associations with force-velocity (FV) profile and its constituent variables (maximal theoretical force (V0), power (Pmax) and velocity (V0) and the slope of the FV relationship (Sfv), on a sample of young athletes and active participants (n = 28). There were moderate associations between Pmax and all DSI values (r=0.42-0.69; p<0.05), V0 and all DSI values from CMJ and DSI30 from SJ (r=0.43-0.56; p<0.05), while Sfv was associated only with DSI30 and DSI90 in CMJ (r=0.40-0.43; p<0.05).This suggest that DSI and FV methods provide similar information and can be used in a similar manner to direct an individual’s training.

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