Minute volume is decreased.
Minute volume often rises during activity and falls after rest. For instance, the minute volume may be about 12 liters with modest activity. Depending on the amount of exertion involved, riding a bicycle enhances minute ventilation by a ratio of 2 to 4.
Why is the minute volume decreasing? In other words, the more minute volume, the more carbon dioxide (CO2) the person is emitting; conversely, the less minute volume, the less CO2 the person is emitting.
An individual who is hyperventilating, for instance, would have a higher minute volume
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