The Expiratory Reserve Volume will decrease when an individual is treading water in a lake.
What is Expiratory Reserve Volume?
Expiratory Reserve Volume, ERV, is the additional volume of air which can be forcefully expired with maximum extra effort beyond the volume that can be expired in normal expiration.
ERV normally decreases with exercise.
Therefore, the Expiratory Reserve Volume will decrease when an individual is treading water in a lake.
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