ABSTRACT
Background
High altitude may affect concussion, but prior studies are limited . We tested whether high altitude affects sport-related concussion (SRC) incidence, severity, and recovery.
Methods
Twenty-five thousand eight hundred fifteen baseline and post-injury Immediate Post-Concussion Assessment and Cognitive Testing results were compiled from Florida and Colorado, low (27 m or 62 m) and high (1,640 m or 1,991 m) altitude locations, respectively. Incidence, severity, and recovery of injury were compared between altitudes.
Results
High altitude was associated with increased suspected concussion incidence (adjusted OR, 2.04 [95% CI, 1.86 to 2.24];P < .0001). However, high altitude was associated with lower concussion severity measured by Severity Index (SI) (adjusted OR, 0.42 [95% CI, 0.37 to 0.49];P < .0001). High altitude was associated with decreased recovery from post-concussive symptoms in the migraine (β, −2.72 [95% CI, −3.31 to −2.13]; P < .0001), cognitive (β, −1.88 [95% CI, −2.40 to −1.36]; P < .0001), and sleep symptom clusters (β, −0.30 [95% CI, −0.52 to −0.08]; P = .007). Athletes with initial SI≥8 showed prolonged neurocognitive dysfunction at high altitude (HR, 1.38 [95% CI, 1.06 to 1.81]; P = .02).
Conclusions
High altitude was associated with increased suspected concussions and prolonged recovery but less severe initial injury.
Acknowledgments
None
Disclosure statement
No potential conflict of interest was reported by the author(s).
Previous publications/presentations
A previous version of this project was submitted as a poster to the 2020 AANS Annual Scientific Meeting.