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Effects of bathtub bathing on mental health among Japanese adults: a randomized controlled trial

Effects of bathtub bathing on mental health among Japanese adults: a randomized controlled trial - Effects of bathtub bathing on mental health among Japanese adults

Status
Active, not recruiting
Phases
Unknown
Study type
Interventional
Source
JPRN
Registry ID
JPRN-UMIN000059041
Enrollment
174
Registered
2025-09-11
Start date
2025-09-17
Completion date
Unknown
Last updated
2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Mental health

Interventions

To instruct participants to engage in home bathtub bathing for at least 5 minutes per day, on at least 4 days per week, over an 8-week period. To instruct participants to bathe only by showering at ho

Sponsors

Kobe University
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: Adults aged 18 years or older Without declines in ADL Without any disease that restiicts bathing Without treatments or medications for psychiatric disease Without treatments or medications for sleep problems Not currently taking bathtub bathing Willing to eighter take bathtub bathig at least 4 days in a week or continue bathing only by showering , depending on the random assignment Not currently bathing outside the home (e.g., at publi bath houses or gyms) If female, not currently pregnant or breastfeeding

Exclusion criteria

Exclusion criteria: Individuals aged 17 years or younger With declines in ADL With any disease that restiicts bathing With treatments or medications for psychiatric disease With treatments or medications for sleep problems Currently taking bathtub bathing Not willing to eighter take bathtub bathig at least 4 days in a week or continue bathing only by showering, depending on the random assignment Currently bathing outside the home (e.g., at publi bath houses or gyms) If female, currently pregnant or breastfeeding

Design outcomes

Primary

MeasureTime frame
Simplified Japanese version of the WHO-Five Well-being Index (after 4, 8, and 16 weeks)

Secondary

MeasureTime frame
Self-related health, Japanese version of the Pittsburgh Sleep Quality Index, Kessler 6-Item Psychological Distress Scale, Japanese version of the three-item loneliness scale, life satisfaction, bathing satisfaction, Feeling of body heating and pleasantness after bathtub bathing, hypertension medication, BMI, body pain, health complaints

Countries

Japan

Contacts

Public ContactKazuhiro Harada

Kobe University Graduate School of Human Development and Environment

harada@harbor.kobe-u.ac.jp078-803-7886

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026