![illustration of heartbeats ending in a cracked and broken heart](https://flightsafety.org/wp-content/uploads/2020/01/aviationmedicine_dec19-jan20_featured.jpg)
Airline crewmembers experience increases in strain on the heart during the course of multi-day work periods, and the increased strain may result in increased risk of cardiovascular diseases, according to a small study by Northern European researchers.1