As the above effects are resulted from lowering oxygen partial pressure in the blood, persons with cardiovascular or respiratory diseases should be careful when bathing as bathing could worsen their condition due to excessive stimulation.
ただしこの効果は血液中の酸素分圧を下げることによって得られるため、循環器および呼吸器の疾病を持つ患者がむやみに入浴すると、過度な刺激となり症状を悪化させるおそれがある。