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Participants were randomly assigned to receive high oxygen (hyperoxia) or a lower amount of oxygen intended to maintain normal blood oxygen levels (normoxia).

Participants were randomly assigned to receive high oxygen (hyperoxia) or a lower amount of oxygen intended to maintain normal blood oxygen levels (normoxia).

Normal blood oxygen levels are generally above 95 percent in healthy people, said Dr. Ashish Sarraju, a cardiologist at the Cleveland Clinic.

Researchers found that both drinkers and non-drinkers in the ‘normal’ pressure setting had relatively stable blood oxygen concentrations and heart rates. Blood oxygen concentrations were 95% ...