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6.5 Fundamentals in Breathing Performance
Term
Description
cmH
2
O
Pressure exerted by a column of water of 1 cm in height.
1 cmH2O = 0.980665 hPa (or mbar)
Maximum
breath volume
The maximum amount of air you can exhale after filling your lungs
completely
Average range of the general adult population: 3.0
–
6.0 liters
Respiratory
pressure
Inspiratory strength:
Normal range: 20 - 170 cmH
2
O
Average: 75 ±25 cmH
2
O
Expiratory strength:
Normal range: 20 - 230 cmH
2
O
Average: 95 ±35 cmH
2
O
Airflow
resistance
Resistance to airflow during respiration
7. Troubleshooting
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