A study in Sweden suggests that an hour-long spin session can trigger the same biochemical indications as a heart attack. The study’s authors say that the reaction is natural and harmless (provided you don’t have a heart condition), but they note that while it’s already been shown that long periods of strenuous physical exertion like marathons and triathlons can trigger what are known as cardiac biomarkers, the new study reveals that short, intense workouts produce the same chemicals. What’s important to note is that if you do work out intensely and then visit an emergency room for some non-heart-related reason, EMS workers could mis-identify the markers and think you’ve got a problem you don’t.

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