Evidence map›Paper›PMID 29930309›Full record

ArticleScientific reports2018

Habitual hot water bathing protects cardiovascular function in middle-aged to elderly Japanese subjects.

Katsuhiko Kohara, Yasuharu Tabara, Masayuki Ochi, Yoko Okada, Maya Ohara, Tokihisa Nagai, Yasumasa Ohyagi, Michiya Igase

Open access · goldAbstract read
In one paragraph

Article in Scientific reports, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
10citing papers in PubMed, 1 pooled it
1.2field-weighted citation impact, top 19% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

10 citing papers in PubMed, 1 synthesis or guideline pooled it, 24 citations in OpenAlex.

  1. Pooled it
  2. Effects of Bathtub Bathing and Sauna Practices on Cardiovascular and Systemic Health: A Narrative Review.International journal of environmental research and public health · 2026
    Review
  3. Review
  4. Review
  5. Article
  6. Intraindividual correlations between nocturnal urination frequency and sleep blood pressure: the Nagahama Study.Hypertension research : official journal of the Japanese Society of Hypertension · 2025
    Article
  7. Article
  8. Article
  9. Effect of heat stress on vascular outcomes in humans.Journal of applied physiology (Bethesda, Md. : 1985) · 2019
    Review
  10. Review
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors at 2 institutions in 1 country.

Katsuhiko KoharaFaculty of Collaborative Regional Innovation, Ehime University, Ehime, Matsuyama, Japan. kohara.katsuhiko.ib@ehime-u.ac.jp.
Yasuharu TabaraCenter for Genomic Medicine, Kyoto University Graduate School of Medicine, Kyoto, Japan.
Masayuki OchiDepartment of Geriatric Medicine and Neurology, Ehime University Graduate School of Medicine, Ehime, Toon City, Japan.
Yoko OkadaDepartment of Geriatric Medicine and Neurology, Ehime University Graduate School of Medicine, Ehime, Toon City, Japan.
Maya OharaDepartment of Geriatric Medicine and Neurology, Ehime University Graduate School of Medicine, Ehime, Toon City, Japan.
Tokihisa NagaiDepartment of Geriatric Medicine and Neurology, Ehime University Graduate School of Medicine, Ehime, Toon City, Japan.
Yasumasa OhyagiDepartment of Geriatric Medicine and Neurology, Ehime University Graduate School of Medicine, Ehime, Toon City, Japan.
Michiya IgaseDepartment of Geriatric Medicine and Neurology, Ehime University Graduate School of Medicine, Ehime, Toon City, Japan.
Ehime University · JPKyoto University · JP

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Favorable effects of sauna bathing on cardiovascular disease have been demonstrated. Hot water bathing is an alternative, and could also have similar effects. Information pertaining to hot water bathing frequency and water temperature was obtained from 873 subjects. Carotid mean and max intima-media thickness (IMT) and brachial-ankle pulse wave velocity (baPWV) were measured as indices of atherosclerosis. Central haemodynamics were evaluated using radial pulse waveform analyses. Plasma levels of B-type natriuretic peptide (BNP) were measured as an index for cardiac loading. The mean duration of a single hot bath was 12.4 ± 9.9 min. Subject bathing in hot water ≥5 times per week had significantly lower baPWV, central pulse pressure (PP), and BNP after correcting for possible confounding parameters. Stepwise regression analyses revealed that hot water temperature was negatively associated with baPWV, while bathing frequency was negatively related to central PP and BNP. A longitudinal follow-up in 164 subjects showed that hot water bathing ≥5 times per week was associated with significantly lower increase in BNP over time, while the temperature of the water tended to be related to lower increases in carotid max IMT and baPWV. Hot water bathing showed a favorable effect on atherosclerotic and central haemodynamic parameters.

Indexed as

HabitsHot TemperatureAgedAtherosclerosisBathsCarotid Intima-Media ThicknessFemaleFollow-Up StudiesHemodynamicsHumansJapanLongitudinal StudiesMaleMiddle AgedPulse Wave AnalysisTime Factors

Identifiers

PMID29930309
PMCPMC6013438
OpenAlexW2806401828

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.