畑 洋一, 市丸 雄平, 仲西 廣展, 岡本 健次, 大塚 邦明, 上野 照紀, 矢永 尚士

Yoichi HATA, Yuhei ICHIMARU, Hironobu NAKANISHI, Kenji OKAMOTO, Kuniaki OTSUKA, Terunori UENO, Takashi YANAGA

九州大学温泉治療学研究所・気候内科

Department of Bioclimatology and Medicine, Research Institute of Balneotherapeutics, Kyushu University

キーワード : bathing, exercise test, LV function, oxygen consumption, after load

The effects of bathing at 37℃ and 43℃ on left ventricular function (LV function) were studied by echocardiography. Subjects were eleven healthy men, ages of whom ranged 27 to 46 (mean ±SD : 34±5.9).Bathing at 37℃ produced a significant increases in left ventricular diastolic dimension (LVDd), stroke volume (SV) and cardiac output (CO) while that at 43℃ produced a significant increase in heart rate (HR),left ventricular posterior wall amplitude (LVPW amp.), mean posterior wall velocity (mPWV), maximum posterior wall velocity (max. PWV) and maximum interventricular septum velocity (max. IVSV) as well as LVDd, SV and CO. Exercise stress test induced a similar change in LV function to that during bathing at 43℃ but no enlargement in LVDd. Diastolic blood pressure (DBP) decreased in bathing at 37℃ and 43℃, while systolic blood pressure (SBP) decreased in bathing at 37℃, and increased in bathing at 43℃. VO2 increased transiently at the beginning of bathing at both temperatures and then returned to control level, while in ergometer test it increased gradually with an increase in load.
　Above results show that there is a dissociation in response to bathing between cardiac and pulmonary function. Bathing at 37℃ may be advantageous for cardiac patients because there is a decrease in afterload, although careful consideration is necessary on the possibility of arrhythmias due to sudden changes in temperatures at bathing.