• The average adult breathes 12 – 20 times a minute.
  
  
• Tidal Volume:  the amount of air you breathe in and out during one respiratory cycle.
  
  
• Vital Lung Capacity: the total volume of air exchanged from deepest inhalation to deepest exhalation which varies depending upon height, weight and age.
  
  
• Total Lung Capacity in adults (normal, healthy) is 3 to 5 liters.
  
  
• In an upright posture, most conversational speech occurs within 40-80% of vital lung capacities.
  
  
• Singing long phrases may require all the reserve volume of the lungs.  Singing requires significantly more lung volume than conversational speaking.
  
  
• When the vocal folds are adducted for singing or speaking, there is greater resistance to the airflow.  More lung pressure is necessary to expel the air effectively.
  
  
• As the pitch goes higher, the vocal cords elongate and become stiffer, which requires more lung pressure to maintain the same amplitude of vibration.
  
  
• Much of the speech breathing information reported here is extracted from Ingo R. Titze’s, Principles of Voice Production.

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