Neurophysiological and cognitive impairment following repeated sports concussion injuries in retired professional rugby league players.

Abstract:

BACKGROUND:Concussion is regarded as a common injury in rugby league, however no studies have explored the long-term neurophysiological and cognitive effects of repeated concussion injuries in this sport. METHODS:Former professional rugby athletes (n = 25) were compared to 25 age-matched participants with no history of a concussion. All participants completed standardised motor dexterity, reaction time, and cognitive tasks for working memory, associative learning and rule acquisition and reversal. Single-pulse transcranial magnetic stimulation (TMS) acquired motor evoked potentials and cortical silent period (cSP), as well as paired-pulse TMS for short latency intracortical inhibition and long intracortical inhibition (LICI). RESULTS:Compared to controls, dexterity and visuomotor reaction time was slower in the rugby group compared to controls (p = 0.02, p < 0.01, respectively). The rugby group also demonstrated poorer cognitive performance than controls (p range 0.02 to < 0.01). TMS revealed significantly reduced cSP at suprathreshold stimulation intensities (p range 0.02 to <0.01), and increased LICI (p = 0.03) in the rugby group. DISCUSSION:These findings of motor and cognitive changes, along with neurophysiological alterations, particularly with intracortical inhibition, nearly two decades post-concussion provides evidence for long-term sequelae for athletes with a history of repeated head trauma in contact sports.

journal_name

Brain Inj

journal_title

Brain injury

authors

Pearce AJ,Rist B,Fraser CL,Cohen A,Maller JJ

doi

10.1080/02699052.2018.1430376

subject

Has Abstract

pub_date

2018-01-01 00:00:00

pages

498-505

issue

4

eissn

0269-9052

issn

1362-301X

journal_volume

32

pub_type

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