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Area of Science:

  • Sports Science
  • Biomechanics
  • Human Movement Analysis

Background:

  • The impulse-based dynamic strength index (iDSI) considers time-dependent force expression, potentially offering greater insight for training recommendations than the traditional peak force-based DSI (fDSI).
  • A limitation of iDSI is its sensitivity to changes in countermovement jump (CMJ) propulsion phase duration, which can complicate longitudinal comparisons.
  • A fixed-duration iDSI (e.g., 250 ms) may overcome the longitudinal comparison limitations associated with variable propulsion durations.

Purpose of the Study:

  • To investigate the effect of different Dynamic Strength Index (DSI) calculation methods (fDSI, iDSI matched, iDSI fixed) on DSI values.
  • To determine how these calculation methods influence resultant training prioritization for athletes.
  • To compare the consistency of training recommendations derived from each DSI calculation method.

Main Methods:

  • Thirty-seven team sport athletes performed maximal effort countermovement jumps (CMJ) and isometric mid-thigh pulls (IMTP) on force plates.
  • fDSI was calculated based on peak force.
  • Fixed iDSI was calculated using the initial 250 ms of the IMTP.
  • Matched iDSI was calculated using a duration matched to the CMJ propulsion phase.
  • Training recommendations were categorized based on DSI thresholds (>0.80, 0.60-0.80, <0.60).

Main Results:

  • Fixed iDSI values (0.88 ± 0.11) were significantly and meaningfully higher than both fDSI (0.82 ± 0.12) and matched iDSI (0.82 ± 0.11).
  • There were no significant differences between fDSI and matched iDSI.
  • Training recommendation consistency was higher between fixed iDSI and matched iDSI (84.2%) compared to fDSI and matched iDSI (44.7%) or fDSI and fixed iDSI (55.3%).

Conclusions:

  • Meaningful differences exist between various iDSI calculation methods, impacting training recommendations.
  • A fixed-duration iDSI provides more consistent training recommendations and may be preferable for tracking physical performance longitudinally.
  • The choice of DSI calculation method significantly influences athlete assessment and training prescription.