Our expert says:
It's related to how your body alters its circulation during exercise and also possibly breathing related. You get a condition in respiratory physiology where people are called "Pink Puffers" - this is the colloquial term for a person who has something called Chronic Obstructive Pulmonary Disease (COPD), which is chronic bronchitis or emphysema. Now, it doesn't sound that you have this condition, so I don't mean to alarm you, but it might be relevant because the pink complexion these people develop when they exercise is because they hyperventilate to maintain normal oxygen in the blood. This is likely what is happening to you, though I must confess I'm not sure (never have been) why some have this and others not. It is likely related to sensitivity to the control of breathing. So I feel that your problem is likely caused by this. What this means is that as you continue to get fitter, it will eventually lessen, because you'll hyperventilate less, so while that may be scant consolation, it will stop happening in time!
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