Table 1.

Types of respiration defined by using breath rate per a minute in medical field.

Respiration Type	Definition and Property of Respiration
Eupnea	→A type of respiration when the breathing rate per minute is 12 to 20 on average by adult male standard.
Bradypnea	→A type of respiration with a breathing rate of 12 breaths per minute or less. When compared with general breathing, the depth of inhalation and exhalation is lowered, and the breathing cycle is increased. It is often observed when sleeping and may be caused by disease.
Tachypnea	→A type of shallow breathing with a breathing rate of 20 breaths per minute or more. It can occur in the presence of illness such as fever, weakness, or mental instability. At normal times, it may occur during light exercise.
Apnea	→Breathing which shows a reduction of more than 90% of the normal respiratory flow for at least 10 s during sleep. This causes the amplitude to be very small in the respiration signal.