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Exertional Dyspnea. Shortness of breath during exercise (exertional dyspnea) produces a sensation of not being able to get enough air and a feeling of being out of breath..A number of factors can cause exertional dyspnea, but they are usually related to insufficient tissue oxygenation by the blood.xertional Dyspnea. Shortness of breath during exercise (exertional dyspnea) produces a sensation of not being able to get enough air and a feeling of being out of breath..
A Discovery Health answered. Trouble with breathing or shortness of breath, which is known as dyspnea, is a common symptom of heart failure. This happens when excess fluid builds in the lungs, which is known as pulmonary edema. As the build up of fluid increases, it may cause difficulty in breathing that interferes with sleep.