prolonged oxygen breathing triggers vasoconstriction and reduces cerebral blood flow

Prolonged hyperoxia (>15-30 minutes) leads to increased peripheral vascular resistance and general vasoconstriction of most organs, including decreases in cerebral blood flow.

What this means for you

Your body actively regulates blood flow in response to elevated oxygen levels — a natural protective mechanism. Understanding this response helps explain why oxygen sessions are typically kept to specific durations and concentrations, so your body gets the benefit of increased oxygen availability without triggering the counterbalancing vascular response.

The published research

Effect of ozone therapy on cerebral blood flow: A preliminary report.
· 2000
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