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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).
  Normal respiratory rate reported in a healthy adult varies from source to source: between 12 to 20 breaths per minute[1], between 10-14,[2], between 14-18[3], etc. (With â¦ such a slow rate, it is best to count the number of breaths over a full minute for accuracy.). 7 people found this useful.