|The effect of dynamic bathing on physiological responses as compared to usual bathing (still bathing) were studied on 6 healthy subjects whose mean years, stature, weight and %fat were 33.3±2.8yr, 168....8±6.9cm, 69.6±13.0kg and 16.3±5.0%.The dynamic bathing consisted of a water flow of O.95〜1.1m/sec, and it was the same as still bathing except for the water flow. Thus the only difference in the two types of bathings lies in the hydrodynamic pressure of the dynamic bathing. The oxygen intake(VO2), heart rate(HR) and rectal temperature(RT) were all continuously measured for 2Ominutes during both types of bathing and for 40minutes after bathing. The Hb concentration, Hct values and plasma volume's relative changes(%PV) were measured at rest, at 20minutes during the bathing and at 20minutes after bathing. The body weight was measured before bathing and 40minutes after, respectively. The water temperature during dynamic and still bathing was 38.5±0.03℃ and 38.7±15℃, respectively. The VO2 did not vary during the dynamic bathing, except for a momentary increase when entering or leaving the bathtub. On the other hand, the HR and RT gradually increased during dynamic bathing. But VO2, HR and RT responses also showed the same tendency during still bathing. The Hb and Hct increased more at 20minutes during both types of bathing and after both types of bathing than at rest, but the %PV decreased. The body weight loss during dynamic bathing was also the same as that during still bathing. These results suggest that the effects of dynamic bathing on the VO2, HR and RT responses and blood properties are not substantially more than usual still bathing under either hydrostatic pressure or hydrodynamic pressure.