Heat-retention effects of hydrogen-rich water bath assessed by thermography for humans.
Shinya Kato, Yuki Takada, Nobuhiko Miwa · Journal of thermal biology · 2021
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Independent study record
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H2HUBB TAKEAWAY
In 24 healthy participants, the thermograms indicated that, under the same conditions (41 °C, 10-min bathing), hydrogen-rich water bath (hydrogen concentrations: 185-548 μg/L; oxidation-reduction potentials: -167 to -91 mV, versus 0.8 μg/L and +479 mV for normal bath, respectively) brought about the heat-retention being more marked than those of normal water bath for several body-parts in the order as follows. Abdomen > upper legs > arms > hands > feet, for 30- and 60-min post-bathing, being in contrast to scarce heat-retention for head, armpits and lower legs. These findings add human evidence supporting molecular hydrogen's therapeutic potential across the specific human outcomes evaluated in this study.
What the Findings Mean
H2HUBB reviewed how hydrogen-rich water affected the outcomes measured in 24 healthy participants. The thermograms indicated that, under the same conditions (41 °C, 10-min bathing), hydrogen-rich water bath (hydrogen concentrations: 185-548 μg/L; oxidation-reduction potentials: -167 to -91 mV, versus 0.8 μg/L and +479 mV for normal bath, respectively) brought about the heat-retention being more marked than those of normal water bath for several body-parts in the order as follows. Abdomen > upper legs > arms > hands > feet, for 30- and 60-min post-bathing, being in contrast to scarce heat-retention for head, armpits and lower legs.
What the Researchers Studied
The researchers studied 24 healthy participants. The study used a human clinical study.
What Effects Did Molecular Hydrogen Have?
Hydrogen-rich water bath devices are commercially available, but have been scarcely clarified for heat-retention effects. In this study, heat-retention effects of hydrogen-rich water bath were assessed by thermographic clinical trials, which employed twenty-four healthy subjects. The thermograms indicated that, under the same conditions (41 °C, 10-min bathing), hydrogen-rich water bath (hydrogen concentrations: 185-548 μg/L; oxidation-reduction potentials: -167 to -91 mV, versus 0.8 μg/L and +479 mV for normal bath, respectively) brought about the heat-retention being more marked than those of normal water bath for several body-parts in the order as follows. Abdomen > upper legs > arms > hands > feet, for 30- and 60-min post-bathing, being in contrast to scarce heat-retention for head, armpits and lower legs. The authors concluded that the hydrogen-rich water bath was suggested to exert heat-retention effects exceeding over normal water bath, in diverse body-parts such as abdomen, upper legs, arms and hands, via promotion to blood flow which was reflected by expanding the thickness of capillary.
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 24 healthy participants. The reported sample size was 4. The study used a human clinical study. The hydrogen delivery method was hydrogen-rich water.
Limitations and Safety
No separate limitations or safety findings were identified in the source text available to H2HUBB.
Original Study and H2HUBB Research Context
H2HUBB presents this source-grounded research record as one contribution to the broader molecular-hydrogen evidence base.