In the short term, your body will undergo the following changes: ventilation (respiratory rate) increases in response to a lower amount of oxygen in the blood, blood then becomes more alkaline (meaning less acidic) as you hyperventilate, and this alkaline state in turn signals your body to breathe less than you should in order to get substantial oxygen to your tissues. (blog.bridgeathletic.com)
The researchers found that people who have more copies of the gene variants (by inheriting a copy of each advantageous variant from both parents), had the least amount of oxygen in their blood and used it more efficiently than people without either variant, or only one copy from one parent. (sciencemag.org)
But but do you know that your body tries even harder to maintain the right amount of oxygen in your blood (a pH of 7.365)? (thebestofrawfood.com)