Heading in Football: Biomechanics, Brain Health, and the New Science of Risk

Introduction

Heading is a defining skill of football, it creates goals, clears danger, and changes matches. But it is also the most neurologically controversial action in the sport. Research over the past decade has accumulated evidence linking repeated heading, not just concussive impacts, but the routine, sub-concussive contact that occurs in every training session and every match, to measurable changes in brain structure, function, and long-term neurological health. Understanding the biomechanics of heading, and what the science says about cumulative impact risk, is now a clinical and ethical obligation for everyone involved in football.

The Science

Biomechanics of the header: In a legal, technically correct header, the player drives their head into the ball using neck musculature activation to generate a controlled, intentional impact. Head velocity at contact ranges from 4–8 m/s. Ball velocity at impact from a cross or corner ranges from 15–30 m/s. The resulting head linear acceleration ranges from approximately 15–30g (g = gravitational acceleration units) for routine defensive or offensive headers.

Comparison: Concussion-producing impacts typically exceed 80–100g. Single routine headers operate well below this threshold, hence “sub-concussive.” The concern is cumulative: 1,000 headers at 20g over a season may produce neurological effects that a single 100g concussive impact would not predict.

Neck strength and heading safety: Stiff necks reduce head acceleration during heading by up to 30%. A weak neck allows more head displacement at impact, transmitting more acceleration to the brain. Neck strength training is a biomechanical intervention for heading safety, not just injury prevention for general cervical health.

Head acceleration profiles: Impact acceleration has both linear (linear translation) and rotational components. Rotational acceleration, the head spinning around its centre of mass, is more neurotoxic than linear acceleration at equivalent magnitudes. Off-centre headers (contact not directly through the ball’s centre) produce higher rotational acceleration. This is why awkward, reactive headers are more biomechanically risky than intentional, well-timed ones.

What Research Says

Lipton et al. (2013) published neuroimaging data in the journal Radiology, comparing diffusion tensor imaging (DTI) brain scans of amateur footballers stratified by heading frequency. Players who headed more than 1,800 times per year showed significantly reduced white matter integrity in frontal and parietal regions, areas associated with attention, memory, and processing speed. These structural changes were not associated with concussive events but with routine heading volume.

Di Virgilio et al. (2016) measured functional brain changes after a single heading session in EBioMedicine, finding transient reductions in corticomotor inhibition (measured by transcranial magnetic stimulation) lasting up to 24 hours post-session. The study demonstrated measurable neurological disruption from a single sub-concussive heading bout, reversible in the short term but raising questions about cumulative effects from multi-session exposure.

Mackay et al. (2019) published a large retrospective study of Scottish professional footballers’ mortality records, finding that former professional players had 3.5 times higher rates of neurodegenerative disease mortality (Alzheimer’s, Parkinson’s, motor neuron disease) compared to age-matched controls from the general population. Former outfield players, who head more than goalkeepers, showed higher rates than GKs, supporting the heading-neurodegeneration link.

Did You Know? Jeff Astle, the West Bromwich Albion and England striker who died in 2002, was the subject of the first coroner’s inquest in the UK to return a verdict of “death by industrial disease” related to football heading. The coroner determined that repeated heading of heavy, leather balls over 16 years had caused his degenerative brain disease. His case was the catalyst for the formal neuroscience research programme that followed, and his family’s campaign led directly to the FA heading restrictions introduced in 2020.

Applied to Football

Practical risk reduction measures consistent with current evidence:

1. Apply FA/national association heading limits in youth training. Under-12s should not practise deliberate heading. Under-16s should limit heading practice sessions. These are evidence-based restrictions, not overcautious bureaucracy.
2. Develop neck strength as standard. Isometric neck strengthening in all planes should be a routine component of youth and professional training. A 30% reduction in head acceleration from neck strengthening is a meaningful safety benefit.
3. Reduce heading in training, not just competition. Sub-concussive risk accumulates with heading volume, matches and unnecessary heading practice combine to determine total exposure. Training heading should be purposeful, not habitual.
4. Prioritise technically correct heading. Centre-of-ball contact with proper neck stiffness reduces rotational acceleration. Poor technique, heading with a relaxed neck or off-centre contact, increases neurological risk per impact.
5. Track heading exposure. Some clubs now log estimated heading counts per player per week. This is nascent but represents the direction of evidence-based heading management. GPS-integrated accelerometers are beginning to make automated heading detection practical.

The Short Version

• Routine headers generate 15–30g head acceleration, below single-event concussion thresholds but accumulated over thousands of exposures
• Rotational head acceleration is more neurotoxic than linear acceleration, off-centre headers are higher risk
• Neuroimaging shows white matter changes in high-volume headers; functional brain changes occur after single heading sessions
• Former professional outfield players have 3.5× higher neurodegenerative disease mortality than general population controls
• Neck strength training reduces head acceleration by up to 30%, a biomechanical protective intervention

References

• Lipton, M. L., Kim, N., Zimmerman, M. E., Kim, M., Stewart, W. F., Branch, C. A., & Lipton, R. B. (2013). Soccer heading is associated with white matter microstructural and cognitive abnormalities. Radiology, 268(3), 850–857.
• Di Virgilio, T. G., Hunter, A., Wilson, L., Stewart, W., Goodall, S., Howatson, G., … & Ietswaart, M. (2016). Evidence for acute electrophysiological and cognitive changes following routine soccer heading. EBioMedicine, 13, 66–71.
• Mackay, D. F., Russell, E. R., Stewart, K., MacLean, J. A., Pell, J. P., & Stewart, W. (2019). Neurodegenerative disease mortality among former professional soccer players. New England Journal of Medicine, 381(19), 1801–1808.

Next in Series: Tendon Adaptation: How Training Transforms Your Body’s Springs

Discuss this in the forum: Heading the ball: what do we know about brain health?

Written by Hüseyin Akbulut, MSc Coach

Hüseyin Akbulut is the founder of Sporeus and author of THRESHOLD (EŞİK), a 540-page Turkish-language book on endurance science.

• 540pp THRESHOLD Book
• MSc Sport Sciences
• Marmara University

Full profile →