Experimental and clinical studies upon the drinking effect of several hot springs were carried out.
Hot spring waters used were as follows;
(1) “MANJUYU”, being of H₂S-containing acid with pH 3.2, in Noboribetu.
(2) Simple thermal spring of KARURUS Spa, in Noboribetu.
(3) Muriated water of YUNOKAWA Spa, in Hakodate.
(4) Simple thermal spring of TOKATIGAWA Spa, in Obihiro.
Infant mice to which “MANJUYU” or simple thermal water of KARURUS were given, could not grow as well as control mice. Especially “MANJUYU” gave worse infulence than KARURUS to their growth.
The weight of the adrenals of adult mice increased evidently after drinking of “MANJUYU” and KARURUS spring for few weeks. However, as the time of death resulting from drowning was not prolonged, the resistance against stress did not seem to be significantly raised. Therefore it was thought that the hot spring drinking is not always profitable to animals.
Being given to the patients with gastric disorders, muriated water of YUNOKAWA improved the changes of HCl-secretion, juice-secretion and corrected disturbance of stomach movement.
To some patients it had poor infulence however. Beside, one must be careful not to forget that muriated water has a tendency to inhibit diuresis.
Drinking of simple thermal water of TOKATIGAWA has also similar effect to muriated water on gastric disorders. 1/4 of the patients with gastric disorders complained of nausea and vomitting.