Physical and Mental Effects of Bathing: A Randomized Intervention Study

Area of Science:

• Health and Wellness
• Therapeutic Bathing
• Public Health

Background:

• Showering is the predominant global bathing method.
• Whole-body immersion bathing in warm water is prevalent in Japan.
• Previous studies suggest immersion bathing is linked to better subjective health.

Purpose of the Study:

• To compare the health effects of immersion bathing versus shower bathing.
• To evaluate the impact of warm water immersion on physical and emotional well-being.

Main Methods:

• A randomized controlled trial involving 38 participants.
• Two-week intervention periods for both immersion bathing (40°C for 10 min) and shower bathing.
• Participants underwent both interventions in a counterbalanced order.

Main Results:

• Immersion bathing showed significantly better outcomes for fatigue, stress, pain, and self-reported health and skin condition compared to showering.
• The SF-8 Health Survey revealed improvements in general health, mental health, role emotional, and social functioning after immersion bathing.
• Mood state scores indicated reductions in stress, tension-anxiety, anger-hostility, and depression-dejection following immersion bathing.

Conclusions:

• Immersion bathing, unlike showering, induces hyperthermic action, increasing blood flow and aiding metabolic waste elimination for physical refreshment.
• Warm water immersion bathing positively impacts both physical and emotional aspects of quality of life.
• Immersion bathing offers significant health benefits beyond those of showering.