EFFECT OF THERMAL BATHS ON THE MEMBRANE POTENTIAL OF THE HUMAN SKIN
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Membrane potential difference of the human skin was measured in 100 cases of "to the thermal bath accustomed" subjects and 5 cases of control, "to the thermal bath not accustomed" healthy subjects.Three Spas were chosen for the experiment:Nozawa: Simple sulfur springsShibu-Kakuma: Calcium sulfate containing sodium chloride springsAsama: Simple thermalsThe investigation revealed an electrically negative membrane potential of the human skin against the thermal waters. The membrane potential of the control subjects…"to the thermal bath not accustomed"…proved 5-36 mv lower than the membrane potential of the "to the thermal bath accustomed", namely inhabitants of the spas.The membrane potential of the healthy controls…"to the thermal bath not accustomed"…approached to that of the "to the thermal bath accustomed" after taking thermal baths daily two times for from ten days to two weeks.The membrane potential of the visitng patients was in the first stage of till ten days similar to that of the healthy controls.But after about twenty baths it changed gradually and took a tendency to approach to that of the spa inhabitants.The negative membrane potential difference of the human skin was transiently increased by a thermal bath both in the "to the thermal bath accustomed" and in the "to the thermal bath not accustomed." But it resulted stronger in the control group than in the spa inhabitants.The increased membrane potential difference recovered its pre-bathing value in about one hour.Raising of water temperature increased the membrane potential difference, namely the higher the temperature rises (→45°C) the greater becomes the potential difference.The membrane potential of the thermal waters against the physiological saline proved to be 3-28mV. Their pH ranged from 5.8 to 9.5. And their reductionoxidation potential ranged from -80 to +298mV.Oshima and his co-workers could show with radioactive isotopes that the percutaneous resorption of the ions in bath water decreased by the repetition of daily baths in one to two weehs. Biological reactions to the thermal baths (phagocytosis index, leucocyte count, red cell count, blood sugar level, blood catalase activity, index of wound healing etc.) proved also to become decreased in 2-4 weeks of thermal bathing. And it is known in Japan that the spa treatment is less effective in the spa inhabitants…"to the thermal bath accustomed"…than in the transient spa visitors…patients. All these observations show that an organism does adapt to the thermal or chemical stimuli of the thermal waters in a few weeks gradually. The objective change in one of the physical properties of the human skin by the repetition of daily thermal baths gave a clue to the explanation of the mechanism of the adaptation.
- 一般社団法人 日本温泉気候物理医学会の論文
一般社団法人 日本温泉気候物理医学会 | 論文
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