CO2 tolerance refers to the body's ability to tolerate higher levels of carbon dioxide in the bloodstream. This is important because a low CO2 tolerance can cause feelings of discomfort, anxiety, and even panic, which can lead to shallow breathing or hyperventilation. Having a higher CO2 tolerance can help individuals manage their breathing better and reduce the risk of these symptoms. In this blog, we'll discuss the benefits of CO2 tolerance training, how to test your CO2 tolerance, and the steps involved in CO2 tolerance training.
Benefits of CO2 Tolerance Training:
CO2 tolerance training can have many benefits for individuals, especially those with respiratory conditions such as asthma or Chronic obstructive pulmonary disease (COPD). Improving your CO2 tolerance can help you breathe more efficiently and reduce the risk of hyperventilation or panic attacks. It can also help improve athletic performance and endurance, as well as reduce stress and anxiety.
Testing Your CO2 Tolerance:
There are several ways to test your CO2 tolerance. One of the most popular methods is the breath hold test. Here are the steps involved in this test:
Sit down in a comfortable position and breathe normally for 1-2 minutes to get into a relaxed state
Take 2 smalls breaths through the nose.
Hold your breath for as long as you can without going into discomfort (meaning once you finish your test you shouldn’t be gasping for more air)

Image taken from "The Oxygen Advantage" by Patrick McKeown
Results
0 -10 seconds- very bad
10-20 seconds- bad
20-40 seconds- acceptable
40-60- seconds- good
60 seconds + very good
Additional benefits
Elevated carbon dioxide (CO2) levels in the blood play a crucial role in promoting blood vessel dilation and enhancing the function of the cerebellum. When CO2 levels rise, it triggers a response in the body known as vasodilation, wherein blood vessels expand to allow for increased blood flow. This process is particularly beneficial for the circulatory system, as it improves oxygen delivery to various organs and tissues.
The functionality of optimising your CO2
When it comes to optimising movement patterns the cerebellum plays a critical role in helping with balance, accuracy and coordination along with many other functions. Doing exercises that involve increasing your CO2 helps with activating your extensors or posterior muscles, it helps with balance and vision.
Conclusion:
CO2 tolerance training can help improve your breathing efficiency, reduce stress and anxiety, and improve athletic performance. Testing your CO2 tolerance can be done using a breath hold test or a CO2 tolerance device. CO2 tolerance training involves practicing diaphragmatic breathing, breath holds, and breath holds with exercise, while monitoring your progress over time. With consistent practice, you can improve your CO2 tolerance and enjoy the many benefits that come with it.
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