In a study highlighted below, doctors found that NHL players flying within 6 hours after sustaining a concussion missed approximately 33% more games than players that did not fly after concussion. This observation highlights the impact of pressure change on concussions. Most aircraft are pressurized so as to maintain passengers at pressure equivalent to an altitude between 6500 and 8000ft. Studies looking at pressures higher than the normal atmospheric pressure (hyperbaric pressures) have been shown to be beneficial to athletes that have sustained concussions. Cerebral vasoconstriction and increased oxygen availability were seen as the primary mechanisms of HBOT in mTBI. HBOT improves cerebral aerobic metabolism at a cellular level, by enhancing damaged mitochondrial recovery.
IMPACT OF AIR FLIGHT ON GAMES MISSED POST CONCUSSION IN NHL PLAYERS
D Milzman, J Altman, Z Hatoum, D Berman, A Neustadtl, K Pasternac,
M Campbell. Georgetown University School of Medicine, Washington, USA 10.1136/bjsports-2014-093494.213
Background Concussions(mTBI) occur at variable reported rates of 1–4 per 100 player games in the NHL. Hypoxia exacer-bates neuronal death following mild TBI in animals and Oxygen deprivation leads to greater mitochondrial dysfunction in con-cussed brains. This study will evaluate the impact of mild hypoxia associated with airline travel on duration of concussion symptoms in NHL players.
Methods All NHL players with publicly reported concussions in 2010–11 through the 2012–13 (3) seasons were evaluated to determine the impact of air ﬂight with pressurized cabins in the immediate 4–6 hour period following games in which the con-cussion occurred. This retrospective cohort study used publicly available post-game reports of concussion, next game played, and air distance traveled. Players with any associated injury were excluded. All available NHL and team reports were used to conﬁrm travel night-of following an away game to either next stop of road trip (NHL) or home location and diagnosis of con-cussion and games missed. Only ﬂights within 6 hours of end of game were included.
Results 239 concussions occurred during the 3 study seasons of which 35 players were excluded for additional injuries or con-cussion lasted over the end of a season. 202/204 (99%) of NHL players with diagnosed concussions missed at least one game with a mean 9.2 games (SD +/- 9.6) missed. Those players that ﬂew after suffering an mTBI missed 32.9% more games with: 10.5 (95% CI: 2.5–17.7) missed games and 26.5 days for those 99 NHL’ers (95% CI: 2.5–17.7) VS. 7.9 (95% CI: 0–16.5) games and 20.7 days for the 205 NHL’ers that did not ﬂy; P<.01. Odds Ratio to miss games post concussion after air travel to no air travel: 3.8:1.
Discussion This initial report of an increased rate of recovery in terms of nearly 1/3 more games missed, for professional ath-letes ﬂying commercial airlines due to likely increased concus-sion penumbra and lack of brain rest following mTBI. Future studies should evaluate standard 48–72 hour post mTBI brain rest, without any air ﬂight to abate the decreased oxygen tension suffered during pressurized cabin ﬂight.