Explaining High-Velocity Movement: Do Isometric or Heavy Strength Measures Show Stronger Associations? A Systematic...

Area of Science:

• Sports Science
• Exercise Physiology
• Biomechanics

Background:

• Determining the superior strength measure (heavy dynamic vs. isometric) for high-velocity performance is crucial for effective athlete assessment and training.
• Optimizing physical development for sport-specific outcomes requires understanding the relationship between different strength types and performance.

Purpose of the Study:

• To systematically review and meta-analyze existing literature comparing heavy dynamic and isometric strength measures.
• To assess the associations of these strength measures with jump, sprint, and agility performance.

Main Methods:

• A systematic literature search was performed following PRISMA guidelines.
• Correlation coefficients from eligible studies were converted to Fisher z values for meta-analysis.
• Multivariate meta-analysis was used to synthesize the data from 7 studies and 299 participants.

Main Results:

• Heavy dynamic strength measures demonstrated a small but significant overall advantage over isometric tests.
• Dynamic strength measures were particularly favored for fast strength outcomes (e.g., countermovement jump).
• No significant differences were found for reactive strength or agility performance between the two strength types.

Conclusions:

• Heavy dynamic strength tests exhibit a stronger association with high-velocity performance compared to isometric measures.
• The relative effectiveness of dynamic versus isometric strength assessments varies depending on the specific high-velocity outcome.
• A multidimensional approach to athlete profiling, incorporating both dynamic and isometric assessments, is recommended.