Impulse-Based Dynamic Strength Index: Considering Time-Dependent Force Expression

The dynamic strength index (DSI) is a useful tool to assess an athlete's capacity effectively use maximum during tasks. Although DSI traditionally calculated based on peak forces, the ability express force over time (i.e., impulse) better predictor of performance. purpose this study was investigate association between (fDSI) and impulse (iDSI). Nineteen female collegiate lacrosse players performed countermovement jumps (CMJs) isometric midthigh pulls (IMTPs). Peak were extracted from CMJ IMTP force-time data. Countermovement jump by integrating concentric movement time, whereas CMJ-matched time. Ratios used calculate fDSI iDSI, respectively. A moderate positive correlation existed iDSI ([rho] = 0.644 [0.283-0.840], p 0.003). Based thresholds established in literature, 2 indices suggest conflicting training recommendations for 37% athletes. Because performance, may represent more valid method assessing Practitioners researchers want consider augmenting current research practices with impulse-based DSI.