Psychophysiological reactions in humans during an open sea dive to 500 m with a hydrogen-helium-oxygen mixture.
J H Abraini, M C Gardette-Chauffour, E Martinez, J C Rostain, C Lemaire · Journal of applied physiology (Bethesda, Md. : 1985) · 1994
Research-use notice
Independent study record
Each H2HUBB study page organizes source-linked research details for educational use. Interpretation should remain proportional to the study design, population, controls, and limitations.
H2HUBB TAKEAWAY
Six commercial divers were evaluated during an open-sea dive to 500 meters while breathing a mixture containing 49% hydrogen together with helium and oxygen. The study reported moderate high-pressure nervous-system symptoms and detectable narcotic effects of hydrogen while the divers completed the operational dive. It is included as related safety and physiology background because this extreme hyperbaric exposure was not a therapeutic hydrogen treatment and cannot be generalized to clinical use.
What the Publication Reported
The authors reported moderate high-pressure nervous-system symptoms, detectable narcotic effects of hydrogen, and successful completion of the operational diving task.
How Molecular Hydrogen Was Addressed
The breathing mixture contained 49% hydrogen together with helium and oxygen under extreme hyperbaric conditions.
How the Publication Was Conducted
Six commercial divers underwent neurological and psychosensorimotor testing during an operational open-sea dive to 500 meters.
What Effects Did Molecular Hydrogen Have?
The study reported moderate high-pressure nervous-system symptoms and detectable narcotic effects of hydrogen while the divers completed the operational dive. Six commercial divers were investigated for neurological and psychosensorimotor responses during an open sea dive to 500 m with a hydrogen-helium-oxygen mixture containing 49% hydrogen. showed only moderate neurological symptoms of high-pressure nervous syndrome, whereas the narcotic effect of hydrogen was detectable, as investigated by psychosensorimotor tests. Finally, these data support the hypothesis that hydrogen can alleviate some of the symptoms of the high-pressure nervous syndrome and can constitute a useful gas for commercial diving, as it decreases the density of the breathing mixture and therefore improves the living conditions, work, and comfort of the divers.
What the Findings Mean
H2HUBB reviewed how molecular hydrogen affected the outcomes measured in Nevertheless, the divers successfully carried out the main purpose of the operational dive, which was to prove the feasability of such diving methods by connecting specific elements of an offshore oil. Finally, these data support the hypothesis that hydrogen can alleviate some of the symptoms of the high-pressure nervous syndrome and can constitute a useful gas for commercial diving, as it decreases the density of the breathing mixture and therefore improves the living conditions, work, and comfort of the divers.
What the Researchers Studied
The researchers studied Nevertheless, the divers successfully carried out the main purpose of the operational dive, which was to prove the feasability of such diving methods by connecting specific elements of an offshore oil. The study used a human clinical study.
Why These Findings Matter
These findings add human evidence supporting molecular hydrogen's therapeutic potential across the specific human outcomes evaluated in this study and contribute to the growing body of molecular-hydrogen research.
How Strong Is This Evidence?
This is human clinical evidence from a human clinical study. H2HUBB interprets the findings in the context of the study design, sample, comparator, and measured outcomes rather than using one publication as a verdict on hydrogen therapy.
Technical Study Details
H2HUBB classifies this publication as human clinical study with human clinical evidence. The research population or model was Nevertheless, the divers successfully carried out the main purpose of the operational dive, which was to prove the feasability of such diving methods by connecting specific elements of an offshore oil. The study used a human clinical study.
Limitations and Safety
No separate limitations or safety findings were identified in the current-study source text available to H2HUBB. This human diving-physiology study used a hydrogen–helium–oxygen breathing mixture under extreme hyperbaric conditions. It is included as safety and physiology background, not as therapeutic hydrogen treatment.
Original Study and H2HUBB Research Context
H2HUBB presents this source-grounded research record as one contribution to the broader molecular-hydrogen evidence base.