Repetitive head impacts can result in functional brain impairments

Repetitive head impacts can result in functional brain impairments

Neuroscience researchers have published the latest results of their ongoing multi-year hockey concussion study examining changes in subconcussive cognitive brain function in male youth ice hockey players.

The research team monitored brain vital signs during pre- and post-season play in 23 Bantam (age 14 or under) and Junior A (age 16 to 20) male ice-hockey players in Rochester, Minnesota.

"Brain vital signs" translates complex brain waves measured using portable electroencephalography (EEG) at the rink-side, into simple, fast, user-friendly and intuitive results that provide an objective evaluation of cognitive brain function. Called the ABCs of brain function, brain vital signs track three well-established neural responses for Auditory sensation (using a response called the N100), Basic attention (using a response called the P300), and Cognitive processing (using a response called the N400).

The study builds on 2019 results published in Brain: A Journal of Neurology that confirmed significant brain vitals sign changes shortly after concussions were diagnosed in Junior A players. Key results of this study showed undetected impairments remained when players were cleared to return to play using current clinical concussion protocols. Notably, the initial study also reported sensitivity to subconcussive impairments in those players who did not sustain a concussion diagnosis over the course of the season.

The current second phase of the study replicated these results and added the Bantam age group. The latest findings were recently published in the peer-reviewed journal Brain Communications in the advanced articles section.

The results of this new Brain Communications study showed:

  • Significant brain vital sign changes in N100 Auditory sensation and N400 Cognitive processing responses for the pre-to-post season comparison across both groups.

  • Differences between the Bantam and Junior A ice hockey players showed more changes in the Junior A group.

  • Importantly, the subconcussive changes were significantly correlated with the number of head impacts over the season across both age groups and consequently showed more subconcussive changes in brain vital signs.

A subconcussive impact is a mechanical force transmitted to the brain below the threshold for a diagnosis of an acute concussive injury. The effects of these low-magnitude impacts may not even be noticeable to the player or to observers on the sideline. Head impacts in the sport of ice hockey typically result from player-to-player or player-to-boards contact due to body checking, collisions and fighting . Some of these impacts are the consequence of foul play, but many of these events also result from routine, legal on-ice behavior.

"Concussion in sports is a major concern for many and our research has shown that having an objective physiological measure of brain function at rink-side is key to detection and managing concussive impacts," says principal investigator of the study.

"Our research has shown that repetitive subconcussive impacts triggered compounding effects in brain function changes, which underscores the importance of shifting our thinking and understanding of concussions as a singular acute-injury model to a spectrum of head-impact exposure and effects over time," says the author.