Initiation of exercise
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The start of exercise cues the body to use more oxygen and produce more carbon dioxide. To cope with the increasing demand of oxygen in the body, rapid breathing begins.
Moderate exercise
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During moderate exercise, the body continues to use more oxygen and so there is an increase in respiration rate (can reach up to 40-60 times per minute) and an increase in heart rate. The speeding up of circulation allows for oxygen to reach muscles and for the muscles to move continuously.
Abrupt ascent into high altitudes
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Abrupt ascent to a higher altitude (where oxygen levels are low) can trigger hyperventilation and an increase in heart rate in order to achieve sufficient oxygen for the tissues of the body. A pattern of rapid and deep breathing can be observed when breathing in high altitudes.
Paralysis of phrenic nerve
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The paralysis of phrenic nerves can cause diaphragm paralysis, which affects its capacity to exchange gases and function properly. Paralysis of the diaphragm may be unilateral or bilateral.
Severe anemia
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The lack of red blood cells that should aid with the circulation of oxygen in the body can cause respiratory distress in people with severe anemia. The lungs then work to bring in more oxygen, which can cause breathing difficulties.
Advanced pregnancy
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The growing fetus compresses the space occupied by the diaphragm and the lungs, which may decrease the amount of air that the lungs can handle.