A recent Mayo Clinic study examining the effects of daylight saving time 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 daylight saving time and serious cardiovascular problems, including heart attacks and strokes. The study looked at 36,116,951 adults aged 18 and up across most US states. (Arizona and Hawaii were excluded since these states do not observe daylight saving time.)
Researchers focused on the week directly after the spring and fall daylight saving time transition when clocks are set either an hour forward or backward.he
“We looked at five years across the US, and what we found is that it’s unlikely that there is a clinically meaningful difference in cardiovascular health due to daylight saving time,” says Benjamin Satterfield, MD, PhD, a cardiovascular diseases fellow and lead author of the study, in a release.
Researchers found 74,722 adverse cardiovascular events occurred throughout the study during the spring and fall daylight saving time 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 Satterfield in a release.
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 daylight saving time 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 daylight saving time 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,” says Bernard J. Gersh, MB, ChB, DPhil, cardiologist and senior author of the study, in a release.
Gersh and Satterfield note that the debate over daylight saving time includes other aspects of health. For example, Satterfield says researchers are exploring daylight saving time’s effect on mental health and its effect on the rates of motor vehicle accidents.
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