How cold is too cold for an outdoor workout, and just how dangerous is shoveling for your heart?

As temperatures drop, many remain committed to their fitness routines, venturing out for runs and bike rides even when the mercury dips into the teens and twenties. But is exercising in such frigid conditions safe? While there isn’t a universally defined temperature threshold that makes outdoor exercise inherently dangerous, certain precautions are crucial, particularly for individuals with pre-existing health concerns.

Understanding the Risks

According to Matt Barberio, an assistant professor in the Department of Exercise and Nutrition Science at the Milken Institute School of Public Health at George Washington University, there’s no blanket prohibition against exercising in the cold. However, those with asthma or other respiratory conditions should be especially cautious. Extremely dry air, often accompanying cold weather, can exacerbate these conditions, and individuals should consult their physicians for personalized advice.

The primary dangers of cold-weather exercise are hypothermia – a dangerous drop in body temperature below 95 degrees – and frostbite. While exercising generally prevents hypothermia, Barberio notes that sweating and subsequent wet clothing can become problematic if exposure is prolonged.

Protecting Yourself from the Cold

When heading outdoors for a workout in cold weather, Barberio emphasizes the importance of paying attention to the air temperature, wind speed, and the resulting “feels-like” temperature. Dressing in layers is key to preventing frostbite. Gloves are particularly important for keeping hands and fingers warm, and a hat worn during a run or under a bike helmet provides additional protection.

For cyclists, generating heat through exertion is beneficial, but Barberio cautions against overdressing. “Use what your body’s telling you,” he advises. “If you’re getting too hot while you exercise, take the layer off until you need to put it back on.” Upon returning indoors, it’s best to allow your body to gradually reacclimate to warmer temperatures and incorporate cool-down exercises.

The Hidden Dangers of Snow Shoveling

Beyond regular exercise, cold weather brings another potential health risk: snow shoveling. Dr. Brian Choi, professor of medicine at George Washington University, notes that each snowstorm brings cases of individuals experiencing health complications from this activity. He describes snow shoveling as “uniquely challenging” compared to other forms of physical exertion.

A key factor is the Valsalva maneuver – holding one’s breath during exertion, which creates pressure in the chest. While aerobic activity is generally beneficial for the heart, the heavy lifting involved in shoveling, especially wet snow, increases resistance and can be particularly dangerous for those with underlying heart conditions. Choi suggests that individuals unaccustomed to physical activity consider hiring someone to shovel snow for them.

Frequently Asked Questions

Is there a specific temperature at which it’s unsafe to exercise outdoors?

“There is not necessarily a cut-off that has been defined, where we say no, don’t go out and exercise, it is not safe,” according to Matt Barberio.

What should people with respiratory conditions do before exercising in cold weather?

Individuals with asthma or other respiratory conditions should “communicate with their physicians about what’s best for them,” Barberio advises.

What is the Valsalva maneuver and why is it dangerous when shoveling snow?

The Valsalva maneuver is holding your breath and creating thoracic pressure. Barberio explains that this can be problematic when combined with the physical strain of lifting heavy snow.

As winter continues, will you adjust your outdoor exercise routine based on these insights?