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Impacts can be classified in various forms, primarily under two subgroups: central impact and oblique impact. A central impact occurs when two objects collide head-on, possessing opposite velocities aligned along the line of impact. Conversely, an oblique impact occurs when two objects collide at an angle, resulting in a modification of both direction and velocity.
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Related Experiment Video

Updated: Sep 12, 2025

In Vivo Protocol of Controlled Subconcussive Head Impacts for the Validation of Field Study Data
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In Vivo Protocol of Controlled Subconcussive Head Impacts for the Validation of Field Study Data

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

Rory England1, Suzie Liverseidge2, Yusuke Miyazaki3

  • 1Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, LE11 3TU, UK. r.england@lboro.ac.uk.

Annals of Biomedical Engineering
|August 5, 2025
PubMed
Summary
This summary is machine-generated.

Reducing football inflation pressure can decrease head impact kinematics, but it

Keywords:
Brain injuryDegenerative brain healthFootballHead impactsHead injuryHeadingInjury biomechanicsSoccer

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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.