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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).
Medical textbooks suggest that the normal respiratory rate for adults is only 12 breaths per minute at rest. Older textbooks often provide even smaller values (e.g., 8-10 breaths per minute).Most modern adults breathe much faster (about 15-20 breaths per minute) than their normal breathing frequency. The respiratory rates in the sick persons are usually higher, generally about 20 breaths/min or more.lder textbooks often provide even smaller values (e.g., 8-10 breaths per minute). Most modern adults breathe much faster (about 15-20 breaths per minute) than their normal breathing frequency. The respiratory rates in the sick persons are usually higher, generally about 20 breaths/min or more.