Exercise, especially when intense, can trigger episodes of asthma or allergies.
Asthma During Exercise
Known sufferers of asthma are especially vulnerable, because during exercise the need for oxygen increases and so does the amount of air that circulates throughout the lungs and breathing passages. With this increased air comes an increased risk of irritating these passages, which can trigger an asthma attack.
Exercising in places with cleaner air will help reduce the chance of an asthma attack. Cold and dry air may make it more difficult to breath and should also be avoided. Exercising at a lower intensity can also help.
Skin Allergy During Exercise
Skin allergies occur while exercising because of the increased sweat production combined with contact between contaminated surfaces and your body. A skin allergy during exercise can also occur due to the clothing that you wear.
Certain materials in clothing, especially synthetic fibers, but also wool, can be more reactive with the skin under increased temperatures and with the presence of sweat.
Avoid synthetic fibers if you notice skin irritation after exercising while wearing them. Wiping down the areas where your skin may contact exercise machines, even if through clothing, is also a good idea.