Mayo Clinic study finds minimal impact of daylight saving time on heart health

NewsGuard 100/100 Score

A recent Mayo Clinic study examining the effects of daylight saving time (DST) on heart health suggests that the impact is likely minimal.

In the nationwide study, researchers applied an advanced statistical model to look for any connections between DST and serious cardiovascular problems, including heart attacks and strokes. The study looked at 36,116,951 adults aged 18 and up across most U.S. states. (Arizona and Hawaii were excluded since these states do not observe DST.)

Researchers focused on the week directly after the spring and fall DST transition, when clocks are set either an hour forward or backward.

We looked at five years across the U.S., and what we found is that it's unlikely that there is a clinically meaningful difference in cardiovascular health due to daylight saving time."

Benjamin Satterfield, M.D., Ph.D., cardiovascular diseases fellow and lead author of the study

Researchers found 74,722 adverse cardiovascular events occurred throughout the study during the spring and fall DST transition. An adverse cardiovascular event was documented when a person was hospitalized with a primary diagnosis of a heart attack, stroke, cardiogenic shock or cardiac arrest.

"These cardiovascular events are common health conditions, so this led to the question of whether this is more than would be expected if this had not followed the daylight saving time transition," says Dr. Satterfield. 

The observance of daylight saving time varies around the world. Countries that move clocks forward or back one hour may do so on different dates, and some do not observe daylight saving time at all.

In the Mayo Clinic study, the Monday and Friday following the spring DST transition showed a statistically slight increase in the rates of cardiovascular events -; but when looking at all the data, researchers did not see the rise as clinically significant, he said.

Researchers note that the time change practice was intended to align social and work activities with daylight hours and to conserve energy using less artificial lighting. They underscore that making changes to the DST system out of concern for heart health is unnecessary.

When decisions are made about whether to abolish daylight saving time, there is no need to take concerns regarding heart health into account."

Bernard J. Gersh, M.B., Ch.B., D.Phil., cardiologist and senior author of the study

Dr. Gersh and Dr. Satterfield note that the debate over DST includes other aspects of health. For example, Dr. Satterfield said researchers are exploring DST's effect on mental health and its effect on the rates of motor vehicle accidents.

Journal reference:

Satterfield, B. A., et al. (2024). Daylight Saving Time Practice and the Rate of Adverse Cardiovascular Events in the United States: A Probabilistic Assessment in a Large Nationwide Study. Mayo Clinic Proceedings: Innovations, Quality & Outcomes.


The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of News Medical.
Post a new comment

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.

You might also like...
Boosting heart health with rewards and fun: How incentives and games encourage exercise