Association Between Dynamic Strength Index Derived from Isometric Squat and Squat Jump or Countermovement Jump and Force-Velocity Profile

ABSTRACT

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 (P_max) and velocity (V₀) and the slope of the FV relationship (S_fv), on a sample of young athletes and active participants (n = 28). There were moderate associations between P_max and all DSI values (r = 0.42–0.69; p < .05), V₀ and all DSI values from CMJ and DSI₃₀ from SJ (r = 0.43–0.56; p < .05), while S_fv was associated only with DSI₃₀ and DSI₉₀ in CMJ (r = 0.40–0.43; p < .05). This suggests that DSI and FV methods provide similar information and can be used in a similar manner to direct an individual’s training.

KEYWORDS:

• dynamics strength index
• force-velocity profiling
• vertical jump
• isometric squat

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The study was supported by Slovenian Research Agency through a research program P5-0443: Kinesiology for the effectiveness and prevention of musculoskeletal injuries in sports.