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Normal respiration rate in adults is 12 breaths/min. Normal breathing, as we discussed, is strictly nasal (in and out), mainly diaphragmatic (i.e., abdominal), slow (in frequency) and imperceptible (or small/shallow in its volume).
Measurement. The human respiration rate is usually measured when a person is at rest and simply involves counting the number of breaths for one minute by counting how many times the chest rises.Respiration rates may increase with fever, illness, and with other medical conditions.ormal findings. Normal respiratory rate reported in a healthy adult varies from source to source: between 12 to 20 breaths per minute, between 10-14, , between 14-18, etc. (With such a slow rate, it is best to count the number of breaths over a full minute for accuracy.).