DALLAS — Clearing sidewalks and driveways of snow may be essential to keep from being shut in, however, the American Heart Association urges caution when picking up that shovel or even starting the snowblower. Research shows that many people may face an increased risk of a heart attack or sudden cardiac arrest after shoveling heavy snow.
The American Heart Association’s 2020 scientific statement, Exercise-Related Acute Cardiovascular Events and Potential Deleterious Adaptations Following Long-Term Exercise Training: Placing the Risks Into Perspective–An Update, notes snow shoveling among the physical activities that may place extra stress on the heart, especially among people who aren’t used to regular exercise. Numerous scientific research studies over the years have identified the dangers of shoveling snow for people with and without previously known heart disease.
The lead author of that scientific statement and long-time American Heart Association volunteer Barry Franklin, Ph.D., FAHA, is one of the leading experts on the science behind the cardiovascular risks of snow shoveling. He has authored a number of studies on the topic, estimating that hundreds of people die during or just after snow removal in the U.S. each year.
"Shoveling a little snow off your sidewalk may not seem like hard work. However, the strain of heavy snow shoveling may be as or even more demanding on the heart than taking a treadmill stress test, according to research we’ve conducted." said Franklin, a professor of internal medicine at Oakland University William Beaumont School of Medicine in Royal Oak, Michigan. "For example, after only two minutes of snow shoveling, study participants’ heart rates exceeded 85% of maximal heart rate, which is a level more commonly expected during intense aerobic exercise testing. The impact is hardest on those people who are least fit."
A study conducted in Canada a few years ago found that the chance of heart attack after a snowfall increased among men but not among women. The study found that, compared to no snowfall, a heavy snow – about 7-8 inches – was associated with 16% higher odds of men being admitted to the hospital with a heart attack, and a 34% increase in the chance of men dying from a heart attack.
"The impact of snow removal is especially concerning for people who already have cardiovascular risks like a sedentary lifestyle or obesity, being a current or former smoker, having diabetes, high cholesterol or high blood pressure, as well as people who have had a heart attack or stroke," he said. "People with these characteristics and those who have had bypass surgery or coronary angioplasty simply should not be shoveling snow."
Franklin said the most important thing is to be aware of the dangers, be prepared and take it easy, including taking short breaks. Even people who are relatively healthy should note that pushing the snow with a shovel is better physically than lifting and throwing it.
The American Heart Association urges everyone to learn the common signs of heart trouble and if you experience chest pain or pressure, lightheadedness or heart palpitations or irregular heart rhythms, stop the activity immediately. Call 9-1-1 if symptoms don’t subside shortly after you stop shoveling or snow blowing. If you see someone collapse while shoveling snow, call for help and start Hands-Only CPR if they are unresponsive with no pulse.
Learn more about cold weather and cardiovascular disease here.









To examine the impact of extreme temperatures with and without high levels of fine particulate pollution, the researchers analyzed 202,678 heart attack deaths between 2015-2020 that occurred in Jiangsu province, a region with four distinct seasons and a wide range of temperatures and fine particulate pollution levels. The deaths were among older adults with an average age of 77.6 years; 52% were older than age 80; and 52% were male. Particulate exposure on the day of each death and one day before death were included in the analysis.
Extreme temperatures were gauged according to the daily heat index (also referred to as apparent temperature) for an area, which captures the combined effect of both heat and humidity. Both the length and extremeness of heat waves and cold snaps were evaluated. Heart attack deaths, or case days, during these periods were compared with control days on the same day of the week in the same month — meaning that if a death occurred on a Wednesday, all other Wednesdays in the same month would be considered control days. Particulate levels were considered high on any day with an average level of fine particulate matter above 37.5 micrograms per cubic meter.
"Our findings provide evidence that reducing exposure to both extreme temperatures and fine particulate pollution may be useful to prevent premature deaths from heart attack, especially for women and older adults," Liu said.
Compared with control days, the risk of a fatal heart attack was observed at the following levels:

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