Does Reduced Ball Inflation Pressure in Association Football Decrease Head Impact Kinematics?

Area of Science:

• Sports biomechanics
• Neurology
• Injury prevention

Background:

• Heading a football is linked to brain health concerns.
• Understanding head impact kinematics is crucial for player safety.
• Reduced ball inflation pressure is a potential intervention strategy.

Purpose of the Study:

• To evaluate the effectiveness of reduced inflation pressure in mitigating head kinematics during football heading.
• To investigate the influence of impact location, head orientation, neck flexion, and ball type on this intervention.

Main Methods:

• A Hybrid III head and neck model was subjected to impacts with two types of modern footballs.
• Impacts were delivered at frontal and oblique locations using a specialized launch device.
• Peak linear and angular accelerations, peak angular velocity, and DAMAGE metrics were analyzed at two ball inflation pressures.

Main Results:

• 90% of impacts showed decreased or unchanged kinematic magnitudes, with average reductions of 2-12%.
• Reduced inflation pressure effectively lowered linear acceleration, angular velocity, and angular acceleration in most cases.
• However, 10% of impacts exhibited increased kinematic magnitudes, particularly for the DAMAGE metric.

Conclusions:

• Reduced ball inflation pressure is a generally effective method for lowering head impact kinematics in football.
• This intervention is not universally effective, as some impacts, especially those analyzed by the DAMAGE metric, showed increased kinematics.
• Impact location, head orientation, and ball type significantly influence the effectiveness of reduced inflation pressure.