Drop Jump Asymmetry is Associated with Reduced Sprint and Change-of-Direction Speed Performance in Adult Female...

Area of Science:

• Sports Science
• Biomechanics
• Human Movement

Background:

• Limited research exists on inter-limb asymmetry's impact on physical performance in adult females.
• Understanding asymmetry is crucial for optimizing athletic performance and injury prevention.

Purpose of the Study:

• To investigate the relationship between inter-limb asymmetry and speed/change-of-direction speed (CODS) in adult female soccer players.
• To identify specific tests effective in detecting asymmetry relevant to performance.

Main Methods:

• Sixteen adult female soccer players underwent a preseason test battery.
• Tests included unilateral countermovement jump (CMJ), unilateral drop jump (DJ), 10m, 30m sprints, and 505 CODS.
• Inter-limb asymmetry was calculated, and Pearson's correlations analyzed relationships.

Main Results:

• Jump-height asymmetry was greater in CMJ (8.65%) and DJ (9.16%) than 505 CODS (2.39%).
• DJ asymmetry correlated significantly with slower 10m, 30m sprint, and 505 CODS performance.
• CMJ asymmetry showed no association with speed or CODS performance.

Conclusions:

• The unilateral drop jump (DJ) test is valuable for detecting limb asymmetries that negatively affect speed and CODS.
• Asymmetry scores across different tests were not significantly related, highlighting the individual nature of asymmetry.
• A single test cannot comprehensively assess inter-limb differences; multiple assessments may be needed.