By Lead writer: Amanda Gardner
February 29, 2016

LIFE.comDo you cough, wheeze, or get short of breath when you exercise in cold weather? You could have asthma, but youve got plenty of company. Exercise-induced asthma is surprisingly common among people who work out in cold climates, whether theyre jogging around the neighborhood or gunning for gold in Vancouver.

This week, for example, Norwegian cross-country skier Marit Bjørgen won the bronze medal in the womens 10-kilometer race, even though she uses asthma medication. In fact, half of cross-country skiers and one-quarter of aspiring winter Olympians in general have exercise-induced asthma according to a 2000 study of 170 athletes conducted by the United States Olympic Committee.

"Any [exercise] outdoors on a mountaintop is a culprit, but just jogging in Central Park will do it as well," says Len Horovitz, MD, a pulmonary specialist with Lenox Hill Hospital, in New York City. Exercise-induced asthma doesnt have to slow you down, however. With the right medications and precautions, exercise-induced asthma wont keep you from your daily workout, or even from competing at an elite level.

How cold and exercise cause asthma
Wheezing, chest tightness, and the other symptoms of exercise-induced asthma generally begin several minutes after you begin working out. For some people, the symptoms start soon after they finish exercising.

More about asthma

Although athletes who compete in warm-weather sports may suffer from exercise-induced asthma as well, mixing exercise and cold, dry air is especially problematic. For many people with regular asthma, in fact, just stepping outside in frigid temperatures is enough to cause symptoms.

"Both cold air and exercise in and of themselves can trigger asthma symptoms, but doing them together is more likely to trigger an exacerbation," says Thomas M. Leath, MD, an assistant professor of pediatrics at Texas A&M Health Science Center College of Medicine.

When the air is dry—as it often is in cold climates during the winter—your lungs can become even more irritated, Dr. Horovitz adds. "The evaporative loss and cooling of the airways triggers the process of bronchial constriction," he says. "One sport you dont see exercise-induced asthma in so much is swimming. The humidity at water level is such that there isnt as much evaporation as in running or winter sports." (Chlorine, however, can trigger asthma symptoms, Dr. Horovitz notes.)

Next Page: Cold air and exercise a "double whammy" [ pagebreak ]The combination of cold air and exercise is "a double whammy," says Steve N. Georas, MD, the director of pulmonary and critical care medicine and the director of the Mary Parkes Center for Asthma, Allergy and Pulmonary Care at the University of Rochester Medical Center, in New York.

The bronchospasms that characterize exercise-induced asthma refer to a contraction (or spasm) of lung airways. Experts arent certain whats behind this phenomenon. One theory is that the increased blood flow caused by exertion forces the blood vessels in the airways to expand, leading to constriction of the airways, Dr. Georas says. Another theory holds that cold air activates certain inflammatory cells in the airways.

"Asthma [is] as an inflammatory disease where, for some reason, the bodys immune response has sent out an alarm about something going wrong in the lungs," says Dr. Georas. "Once that alarm has been set off, theres airway inflammation."

How to fight it
The first-line treatment for exercise-induced asthma is a bronchodilator. Usually delivered via rescue inhalers, these drugs (such as albuterol) fight symptoms by relaxing the muscles that line the airways in the lungs.

The most commonly used bronchodilators, a class of drug known as beta2-agonists, are prohibited by the International Olympic Committee (IOC). Because beta2-agonists can promote muscle growth, athletes with asthma must prove they have the disorder and must receive permission to medicate themselves; otherwise, they run the risk of being disqualified from the Games. "The IOC has really cracked down on this," says Dr. Georas. "A few years ago, a lot of people declared themselves asthmatic, which was thought to be a way to get inhaled steroids."

Learn about the causes of asthma

Fortunately, if you dont need the IOC to sign off on your medications, preventing and treating exercise-induced asthma is pretty straightforward. The best treatment will depend on how often you exercise and whether you can predict when it will occur.

If you experience asthma symptoms every time you exercise in cold weather, you may want to use a bronchodilator 10 to 15 minutes before exercising to prevent an attack, Dr. Horovitz recommends.

If your asthma isnt predictable, keep an inhaler handy while you exercise instead of using it beforehand. "There are patients in whom its intermittent. Sometimes they can exercise, sometimes they cant," says Dr. Georas. "If you feel chest tightness coming on, have your inhaler on you."

In addition to medication, there are other precautions athletes can take. Warming up for a few minutes before hitting full exercise mode, breathing through your nose (to warm and humidify the air before it hits your airways), and wearing a scarf or face mask around your mouth can all prevent symptoms, says Dr. Leath. Masks that contain inserts known as heat exchangers have also been shown to fight exercise-induced asthma in cold weather.

These treatments are effective enough that exercise-induced asthma rarely keeps people from the winter sports they enjoy. Dr. Leath has heard many patients complain of cold air making their asthma worse, but he hasnt seen any asthma exacerbations so severe that they prevent winter activity.

"The whole goal of asthma therapy with each patient is to allow them to conduct their daily activities unfettered," says Dr. Georas.