SATURDAY, Jan. 27 (HealthScout) -- Stepping out in the biting cold can be a bitter shock for most people, but experts say it can suffocate people with asthma.
　　That's why doctors urge asthma patients to take special caution when exercising in the winter.

"Winter is already a difficult time for asthmatics because of the increased incidence of the cold and flu, which can evolve into more serious conditions such as bronchitis or pneumonia," explains Dr. Abraham Sanders, a pulmonologist at the New York Weill Cornell Medical Center. "Adding exercise to the mix can mean even more trouble."

Sanders says part of the problem is an asthmatics' inability to warm up cold air.
　　"The feeling is that asthmatics have problems warming up and humidifying air when they inhale," he explains. "There's some defect that when they breathe in deep air they develop a bronchial spasm."

Dr. Tom Plaut, an asthma expert and author of Dr. Tom Plaut's Asthma Guide, says he's seen the problem right outside his window.

"I have a neighbor who jogs by my house in the summer with no problem," he says. "In the winter, however, he's coughing and it's because he's not wearing a mask."

Covering the face -- especially the nose and mouth -- are crucial when asthmatics exercise in the cold, says Plaut. "The key is to wear either a painter's or a surgical mask because when you breathe out, the mask holds some of the warm air, so the air you breathe in isn't as cold."

Both doctors agree that using asthma inhalers before going outside can also help prevent attacks.

In addition to the cold, winter is full of asthma-inducing problems, says Plaut.

"Other winter problems that can trigger asthma attacks include upper respiratory infections, dirty heating systems, and forced hot air is a problem much more than hot water heating," he says. "So there are a number of additional triggers in the winter, compared to the summer."

Sanders offers these additional tips for asthma sufferers who exercise in winter:

　　Warm up with stretching and light activity before exercising, shoveling snow, or beginning more strenuous physical activities. Make sure you cool down, too.

Take all medications as prescribed, even if you feel fine.

Use common sense: If it's too cold or icy, head inside for a walk around the mall or another activity.

When exercising indoors, be sure the room is well humidified and ventilated.

Dress in layers. Layering clothes underneath a windproof and waterproof shell helps hold body heat.

Drink plenty of fluids. Your body needs fluids in cold weather, too. Try carrying a water bottle.

If you've been sedentary or have health problems, check with your doctor before starting any exercise program.

By Nancy A. Melville
　　From HealthScout.com