Definition
Breathing that is both faster and deeper than the body's metabolic demand requires, causing carbon dioxide to be exhaled more quickly than it is produced. This drop in blood carbon dioxide raises blood pH and is the underlying mechanism of hyperventilation.
Plain English
Breathing too fast and too deeply for what the body actually needs, which flushes too much carbon dioxide out of the blood.
Context Anchor
Seen in aeromedical discussions of hyperventilation, especially when a pilot is anxious, under stress, or trying to recover from an unusual sensation in flight.
Derivation
Respiration comes from Latin words meaning “to breathe.” Rate is how often the breaths happen, and depth is how large each breath is. Together, the phrase points to both parts of breathing that can become too much: how fast and how deep.
Why Pilots Care
Uncorrected, it produces dizziness, tingling, and impaired judgment that can lead to loss of aircraft control.
Grounding Statement
A pilot who starts breathing very fast and deeply during a stressful moment may feel worse because the body is losing too much carbon dioxide.
Intuition Check
Do not assume that more breathing is always better. In this context, breathing too fast or too deeply can create a problem by upsetting the body’s normal balance.
Example Sentence 1
Startled by an unexpected radio call, the student pilot fell into an excessive rate and depth of respiration and began feeling tingling in his fingertips.
Example Sentence 2
During the simulated emergency, the instructor pointed out the student’s excessive rate and depth of respiration as an early sign of hyperventilation.