Normal (and Abnormal) Breathing Patterns at Rest

Normal Tidal Volumes (TV) at rest - approximately 500ml
Normal Respiratory Frequency (RF) at rest - 6-10 breaths/minute
Normal Ventilation (Ve) at rest - 6-12 Litres/minute
Resting ventilation occurs in the mid-range of the lung volumes due to the opposing factors of elastic recoil of the chest well, and the resting tension on the lung tissue itself. Allows for inspiration and expiratory reserves that can be tapped into when needed.
The diaphragm is the primary muscle driver for ventilation on inspiration, and is a large dome-shaped slow-twitch muscle, that can be trained over time, just like any other muscle.
Faster or slower RF or Ve at rest can be an indication of medical condition that requires medical follow-up, but is also seen in athletes who have focussed efforts on respiratory training.
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