Hydrogen Inhalation Slightly Lowers Oxygen Levels in Healthy Women
- Authors
- Pavel Grepl, Jakub Krejčí, Andrew McKune, Michal Botek
- Journal
- Canadian Journal of Physiology and Pharmacology
- Year
- 2025
- DOI
- 10.1139/cjpp-2025-0228
- Study Type
- Human
- Outcome
- Neutral
- Peer Reviewed
- Yes
- Country
- Czech Republic
- Health Condition
- Heart
- Body System
- Cardiovascular
TL;DR
Hydrogen inhalation caused a small, non-meaningful decrease in oxygen saturation but did not affect heart rate variability or autonomic nervous system function in healthy adults.
Key Finding
Sixty minutes of hydrogen gas inhalation produced a statistically significant but clinically insignificant decrease in blood oxygen saturation (95.9% vs 96.7% placebo) and did not alter heart rate variability in healthy women at rest.
Summary
Researchers tested whether breathing hydrogen gas for 60 minutes would affect blood oxygen levels and heart rhythm regulation in 20 healthy young women. They found that hydrogen inhalation caused a small drop in blood oxygen saturation (95.9% versus 96.7% with placebo), but this difference was too small to matter clinically. Heart rate variability—a measure of how well the heart's nervous system adapts—showed no changes with hydrogen compared to placebo.
Practical Takeaway
This small study in healthy young women suggests that breathing hydrogen gas for an hour does not meaningfully affect oxygen levels or heart regulation at rest. However, the findings are limited to resting conditions in a specific population, and more research is needed to understand hydrogen's effects during activity or in other groups.
Abstract (excerpt)
Molecular hydrogen has gained attention for its potential antioxidant, anti-inflammatory, and ergogenic effects. However, its impact on blood oxygen saturation and autonomic cardiac regulation under resting conditions remains unclear. This randomized, double-blind, placebo-controlled crossover…