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Normal range. The typical respiratory rate for a healthy adult at rest is 12â18 breaths per minute. The respiratory center sets the quiet respiratory rhythm at around two seconds for an inhalation and three seconds exhalation.
Normal Respiratory Rate â Respiration-Breathing Frequency. Respiratory rate (respiration rate, breathing frequency, breathing rate, ventilation rate, pulmonary ventilation rate, and respiratory frequency) is the number of breaths that a person takes during one minute.edical textbooks suggest that the normal respiratory rate for adults at rest is only 10-12 breaths per minute. Older physiology textbooks often provide even smaller values (e.g., 8-10 breaths per minute), while more recent textbooks can give up to 15-18 breaths per minute.