サーモグラフィを用いた水素富化水浴の保温効果に関する臨床的検討
A thermographic clinical trial involving 24 healthy participants compared heat retention after hydrogen-rich water bathing (hydrogen concentration 185–548 μg/L; oxidation-reduction potential −167 to −91 mV) versus ordinary water bathing under identical conditions (41°C, 10 minutes). Infrared imaging at 30 and 60 minutes post-bath revealed greater surface temperature maintenance in the hydrogen-rich group across multiple body regions, ranked in descending order: abdomen, upper legs, arms, hands, and feet. Fingertip capillary thickness measurements indicated vascular dilation was more pronounced after hydrogen-rich bathing, pointing to a circulatory-promoting effect beyond simple thermal retention. Heat retention showed weak-to-moderate positive correlations with subcutaneous fat, total body fat, and BMI, and an inverse correlation with skeletal muscle ratio, while basal metabolic rate showed little association. These findings suggest hydrogen-rich water bathing enhances post-bath warmth across diverse body regions through blood flow promotion reflected by capillary expansion.
Hydrogen-rich water bathing appears to dilate peripheral capillaries and enhance blood circulation, producing post-bath heat retention that exceeds what thermal effects alone would predict.
Hydrogen bathing has reports of localized effects, but for systemic hydrogen intake the most efficient route is inhalation. Inhalation carries explosion risk (empirical LFL of 10%; high-concentration devices are documented in the Consumer Affairs Agency accident database and are not recommended).
See also:
https://h2-papers.org/en/papers/33454037