How reliable are lower limb biomechanical evaluations during volleyball-specific jump-landing tasks?

Area of Science:

• Biomechanics
• Sports Science
• Motor Control

Background:

• Ecologically valid biomechanical evaluations of sport-specific jump-landing tasks are crucial for interpreting longitudinal research.
• Understanding the test-retest reliability of these sport-specific tasks is essential for accurate data interpretation.

Purpose of the Study:

• To assess the reliability of hip, knee, and ankle joint angles and moments during volleyball-specific jump-landing tasks.
• To compare the reliability of volleyball-specific tasks with a generic drop vertical jump task.

Main Methods:

• Three-dimensional (3D) biomechanical analyses were conducted on 27 male volleyball players across two sessions one week apart.
• Test-retest reliability was determined using intraclass correlation coefficient (ICC) and standard error of measurement (SEM) for joint angles and moments during spike, block, and drop vertical jumps.

Main Results:

• Joint angle reliability for volleyball-specific and generic tasks was similar, showing excellent-to-good ICC for flexion/extension and abduction/adduction in hip and knee, but fair-to-poor for ankle rotation.
• Joint moment reliability was generally good-to-excellent, with exceptions in hip flexion during spike/drop jumps and knee flexion during volleyball-specific tasks.
• Reliability was consistently lower at the beginning and end of the landing phase compared to the mid-phase for all tasks.

Conclusions:

• Kinematic evaluations of volleyball-specific jump-landing tasks demonstrate reliable use in screening programs, particularly for sagittal plane movements.
• The findings suggest that sport-specific jump-landing tasks can be integrated into screening programs for enhanced ecological validity.
• Careful interpretation is advised due to reduced reliability at the initial and final stages of the landing phase.