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What is the normal respiratory frequency? 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.
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.