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Impaired cerebral haemodynamic function associated with chronic traumatic brain injury in professional boxers

Damian M Bailey1, Daniel W Jones, Andrew Sinnott

  • 1Neurovascular Research Laboratory, Faculty of Health, Science and Sport, University of Glamorgan, Pontypridd, Wales, UK. dbailey1@glam.ac.uk

Clinical Science (London, England : 1979)
|August 24, 2012
PubMed

Insights

Professional boxing impairs cerebral haemodynamic function, including dynamic cerebral autoregulation and cerebrovascular reactivity. These impairments are linked to chronic traumatic brain injury (CTBI) and worsen with increased sparring.

Area of Science:

  • Neurology
  • Sports Medicine
  • Physiology

Background:

  • Professional boxing involves repetitive head impacts, raising concerns about chronic traumatic brain injury (CTBI).
  • Cerebral haemodynamic function, crucial for brain health, may be compromised by such impacts.
  • Understanding these effects is vital for boxer safety and managing long-term neurological consequences.

Purpose of the Study:

  • To investigate the extent to which professional boxing affects cerebral haemodynamic function.
  • To explore the association between impaired cerebral haemodynamics and CTBI in boxers.
  • To identify potential mechanisms linking head trauma to neurological deficits.

Main Methods:

  • Compared 12 professional boxers with 12 non-boxing controls matched for age, gender, and fitness.
  • Assessed dynamic cerebral autoregulation (dCA) using thigh-cuff and transfer function analysis.
  • Measured cerebrovascular reactivity to CO₂ (CVRCO₂), orthostatic tolerance, and neurocognitive function.
  • Utilized transcranial Doppler ultrasound, finger photoplethysmography, capnography, and near-IR spectroscopy for continuous monitoring.

Main Results:

  • Boxers exhibited fronto-temporal neurocognitive dysfunction and impaired dCA (lower rate of regulation and autoregulatory index).
  • Reduced CVRCO₂ was observed in boxers, particularly those with higher CTBI scores, correlating with sparring volume and intensity.
  • Impaired haemodynamics coincided with orthostatic hypotension, cerebral hypoperfusion, and cortical de-oxygenation during orthostatic stress.

Conclusions:

  • Professional boxing leads to chronically impaired cerebral haemodynamic function due to repetitive sub-concussive head impacts.
  • These haemodynamic deficits may contribute to the progressive nature of CTBI, manifesting even after a boxing career.
  • Findings highlight the significant neurological risks associated with professional boxing and the need for protective strategies.

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