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A new study published in the journal Thorax has raised concerns about the combined effects of alcohol consumption and cabin pressure at cruising altitude on heart health during flights, particularly for sleeping passengers. This is the first study of its kind to investigate how these two factors together can impact cardiovascular function—even in young and healthy individuals.
Study Highlights
Researchers recruited 48 healthy adults aged 18 to 40 and divided them into two groups. One group slept in a laboratory at normal sea-level pressure, while the other slept in an altitude chamber simulating the reduced oxygen environment of a typical airplane cabin (equivalent to 2,438 meters above sea level). Participants experienced both alcohol and non-alcohol nights, with alcohol intake equivalent to two beers or two glasses of wine.
Key findings include:
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Significant Drop in Blood Oxygen: The combination of alcohol and simulated cabin pressure caused blood oxygen saturation (SpO2) to fall to an average of just over 85% during sleep. This is well below the healthy clinical norm of 90%.
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Increased Heart Rate: Heart rates rose to nearly 88 beats per minute in the alcohol-plus-altitude group, compared to just under 73 bpm in those who did not consume alcohol.
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Longer Periods of Low Oxygen: Oxygen levels below 90% lasted for over three hours in the alcohol-plus-altitude group, compared to nearly zero minutes in those at sea level without alcohol.
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Reduced Deep and REM Sleep: The crucial N3 (deep sleep) stage dropped to just 46.5 minutes under combined exposure, compared to 84 minutes after alcohol at sea level and 67.5 minutes without alcohol at altitude. REM sleep was also reduced.
Implications for Passengers
While the study focused on young, healthy individuals, the authors warn that the risks could be even greater for older passengers or those with pre-existing heart or lung conditions. Cardiovascular issues already account for 7% of in-flight medical emergencies, with cardiac arrest being a leading cause of aircraft diversions.
The researchers suggest that airlines, passengers, and crew should be made aware of these potential risks. They also propose that it may be time to consider restricting access to alcohol on long-haul flights.
Study Limitations
The study had a small sample size and participants slept lying down, a luxury not available to most economy-class travelers. Therefore, the results may not fully represent the general flying public.
Disclaimer:
This article is based on a recent scientific study and is intended for informational purposes only. The findings are preliminary and may not apply to all individuals or flight situations. Always consult with healthcare professionals regarding health risks associated with air travel, especially if you have pre-existing medical conditions.
