ATLANTA (CNN) -- Jennifer Zora, like most people with asthma, has exercised-induced asthma. That is, it kicks in when during physical activity.

"I don't even remember I have asthma sometimes when I play soccer because of how well the medications work," she said.

That's because Jennifer's doctor, who also happens to be her father, recommends the drug Serevent in addition to her regular inhaler, Ibuterol.

Two studies released this week in the New England Journal of Medicine reported that two drugs, Serevent and Singulair, may work better than other drugs to ease breathing during exercise.

Serevent

Asthma triggered by intense exercise is common, specially when people are active in cold, dry air.

"Recently, [Jennifer] has been in a situation where she's had two soccer games back to back, and she'll need extended protection against exercise-induced asthma and Ibuterol doesn't do that for her," said Dr. John Zora of the Atlanta Allergy and Asthma Clinic.

One study found that Serevent, an aerosol spray known generically as salmeterol, allows patients to exercise for six hours or more, compared to just two hours with other medicines.

Singulair

The second study said Singulair, known generically as montelukast, also reduces exercise-induced asthma. The medicine has been on the market for about a year and is appealing because the daily dose is just one pill taken at night.

Using Singulair and Serevent may be able to reduce the doses of drugs patients already use for asthma and reduce the side effects.

CNN Medical Correspondent Rhonda Rowland and The Associated Press contributed to this report.