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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 Breathing Pattern (Normal Respiration Cycle). Modern physiology textbooks suggest the following parameters of the normal breathing pattern (normal respiration) at rest for healthy subjects: - inhalation is 1.5-2 s. - exhalation is 1.5-2 s. - automatic pause of almost no breathing is 2 s. - tidal volume (the depth of inhalation) is 500-600 ml. - breathing frequency (or Rf-respiratory frequency or respiratory rate) is 10-12 breaths/min. The international physiological norm for the breathing rate at rest is 6 L/min (for a 70-kg man). Normal stress-free breath holding time after usual exhalation (that correlates with body-oxygen content) is 40 s. References for medical textbooks that provide these values are below.