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Definition. Respiratory rate (also known as ventilation rate, respiration rate, breathing rate, pulmonary ventilation rate, breathing frequency, and respiratory frequency or Rf) = the number of breaths a person takes during one minute.It is usually measured at rest, while sitting.efinition. Respiratory rate (also known as ventilation rate, respiration rate, breathing rate, pulmonary ventilation rate, breathing frequency, and respiratory frequency or Rf) = the number of breaths a person takes during one minute.
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.