Experience From - Karl King, John Thieme,
NO, that is complete BS. Who starts such ideas?
- Does the carbon dioxide from carbonated drinks "tie-up" the oxygen carrying capacity of the hemoglobin in the blood?
The caffeine lift is real.
- If yes, does the caffeine lift that runners get from some soft drinks simply outweigh the downside of reduced oxygen capacity?
Most prefer defizzed because the burping from the carbonation, and the pressure in the stomach is uncomfortable while running. Some people strongly prefer the TASTE of the carbonated drink, and so choose that. It is a matter of personal preference.
- Do some runners prefer defizzed drinks to avoid the reduced oxygen capacity, or simply to avoid gastric distress?
It lasts as long as you believe such nonsense. Inquiry is your ticket to freedom.
- Again, if yes to number 1, how long does the effect last?
"All things are easy to understand once they are discovered. The point is to discover them." Galileo Galilei
Some of us who like the fizz find the burping from carbonation a pleasant relief from the uncomfortable pressure that builds in the stomach while running.