Why do you sometimes need to take a big breath?
QUESTION: Why do I sometimes feel the urge to take a big (deep) breath, sigh, or yawn? And this occurs completely automatically. Does the body suddenly need more oxygen or what is the reason?ANSWER: You need to take big breaths and breathe in a lot of air because you have held your breath and, thus, increased the carbon dioxide (CO2) levels in your body.When we breathe the intended way, that is, breathing in a way that corresponds to the body’s needs, we maintain a balance between oxygen and CO2. We take in oxygen from the outside as we breathe in, while CO2 is constantly produced in the body and leaves the body on exhalation.However, when our breathing is stressed — shallow, fast, big, irregular, noisy, tense, labored, and through the mouth — an imbalance between oxygen and carbon dioxide occurs. Shallow, fast, big (which some call deep), noisy, tense breathing through the mouth provides too much oxygen and too little carbon dioxide while holding the breath provides the reverse: too little oxygen and too much carbon dioxide. Irregular and labored breathing alternates between the two.What makes us take the next breath? Surprisingly it is not a lack of oxygen that stimulates breathing. It is the level of CO2 in the body, the CO2 pressure, that controls breathing. As CO2 levels rise, the respiratory center is triggered, which stimulates the phrenic nerve, which, in turn, stimulates the diaphragm to move downward, and we inhale.On the subsequent exhalation, we exhale the excess CO2. When enough CO2 has been built up in the body, the respiratory center is triggered again, and a new breathing cycle begins.When you need to take a big breath, you have probably held your breath, or breathed too little, so that too much CO2 has been built up. The big breath is, after all, accompanied by an equally big exhalation, and then the body gets rid of the excess CO2.The need to take big breaths and to sigh and yawn increases if you have the habit of breathing fast, shallowly, and/or big as this over time increases the outflow of CO2. This type of breathing reduces the CO2 pressure in the body, which makes the breathing center more sensitive, i.e. we develop a lower tolerance for CO2, and the need to sigh or take big breaths increases.Conscious Breathing involves breath awareness, tools, and exercises to help increase the CO2 tolerance, which will lead to optimal oxygenation.
Here are a couple of articles that further explain the role of carbon dioxide in the body:Carbon dioxide pressure more important than blood pressureCarbon dioxide controls breathing