Exploring Sex-Based Variations in Head Kinematics During Soccer Heading.

Area of Science:

• Sports Medicine
• Biomechanics
• Neurology

Background:

• Soccer heading is associated with concussion risk.
• Females exhibit higher concussion incidence and severity than males in soccer.
• Underlying kinematic factors for sex-based differences in heading impacts are not fully understood.

Purpose of the Study:

• To investigate sex differences in head-to-ball impact kinematics during soccer heading.
• To determine the influence of head mass and impact location on these kinematic differences.

Main Methods:

• Laboratory-controlled soccer heading experiment with 40 college players (20 female, 20 male).
• Measurement of impact kinematics (peak angular acceleration/velocity, peak linear acceleration) using instrumented mouthguards.
• Analysis of head mass, sex, and impact location effects on kinematic parameters using MANOVA.

Main Results:

• Females exhibited significantly higher peak angular acceleration (PAA) and peak linear acceleration (PLA) compared to males.
• Head mass, larger in males, inversely correlated with PAA and PLA but did not affect peak angular velocity (PAV).
• Impact location influenced PAV, with frontal impacts yielding higher magnitudes than top-front impacts.

Conclusions:

• Female soccer players experience greater header-induced accelerations, supporting epidemiological data on higher concussion risk.
• Sex-based differences in PAA and PLA, not PAV, are key factors in elevated concussion risk for female players.
• Future research should explore interventions to mitigate high-magnitude accelerations in female soccer players.