Radioisotope Facilities for Medical Science, Mie University, Edobashi 2-174, Tsu, Mie, 514-8507, Japan.
Incorporated Association Institute for Hydrogen Medicine, MinatoJima-Minami 1-6-4, ChuOh-ku, Kobe, Hyogo, 650-0047, Japan.
J Therm Biol. 2021 Jan;95:102805. doi: 10.1016/j.jtherbio.2020.102805. Epub 2020 Dec 5.
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. Then, as reflection to promotive effects on blood stream, we also examined the thickness of fingertip-capillary in hands. The thickness was expanded in the hydrogen-rich water bath more markedly than that in the normal water bath, suggesting that the hydrogen-rich water bath may have the hydrogen-based promotive effect, exceeding over mere heat retention-based effects, on blood circulation of the whole body. Meanwhile, the heat-retention in hydrogen-rich water bath weakly or moderately correlated with contents of the subcutaneous fat, whole body fat and body mass index, and inversely correlated with skeletal muscle rates, although their correlation degrees did not obviously exceed over normal water bath, with a poor relation with the basal metabolism rate. Thus, 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. The heat-retention after bathing can be noted as effects of the hydrogen-rich water bath, which is applicable for most of people widespread regardless of their body composition index.
富氢水疗设备已经商业化，但对于其保温效果仍缺乏明确的研究。本研究通过热成像临床试验评估了富氢水疗的保温效果，该试验共纳入了 24 名健康受试者。结果显示，在相同条件（41°C，10 分钟洗浴）下，富氢水疗（氢浓度：185-548μg/L；氧化还原电位：-167 至-91mV，分别相对于正常水疗的 0.8μg/L 和+479mV）对腹部、大腿、手臂、手部和脚部的保温效果明显优于正常水疗，而对头部、腋窝和小腿的保温效果则较差。然后，作为对血流促进作用的反映，我们还检查了手部指尖毛细血管的厚度。富氢水疗组的毛细血管厚度扩张比正常水疗组更明显，提示富氢水疗可能具有基于氢的促进作用，超过了单纯的保温作用，对全身血液循环有影响。同时，富氢水疗的保温效果与皮下脂肪、全身脂肪和体重指数的相关性较弱或中等，与骨骼肌率呈负相关，尽管其相关性程度并不明显超过正常水疗，与基础代谢率的关系也较差。因此，富氢水疗在腹部、大腿、手臂和手部等多个部位发挥了优于正常水疗的保温效果，这可以通过扩张毛细血管的厚度来反映血流的促进作用。沐浴后的保温效果可以被认为是富氢水疗的效果，它适用于大多数人，无论其身体成分指数如何。
