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Randomized trial · measured the question itself

8-week trial in 47 adults found more blood pressure drop with exercise plus sauna

Lee and colleagues · American journal of physiology. Regulatory, integrative and comparative physiology · 2022

Original title: Effects of regular sauna bathing in conjunction with exercise on cardiovascular function: a multi-arm, randomized controlled trial.

Under review. A person has not yet checked this summary against the paper. It is written from the PubMed abstract. Until a person checks it, search engines are asked not to list this page.

What the study found

Points to benefit

Exercise plus sauna gave lower systolic blood pressure (-8.0 mmHg; 95% CI, -14.6 to -1.4 mmHg) and better fitness (+2.7 mL/kg/min) than exercise alone. Exercise alone did not change blood pressure vs control.

The study at a glance

Type of study
Randomized trial
Who or what was studied
47 people · inactive adults aged about 49 with at least one heart disease risk factor
What was tested
8 weeks of exercise plus a 15-minute sauna after each session, vs exercise alone, vs no change in routine
What it measured
The question itself: heart disease, blood pressure and death
How long
8 weeks
Trial registration
10.6084/m9.figshare.20160479.v1, 10.6084/m9.figshare.19575979.v1, 10.6084/m9.figshare.19576030.v1, 10.6084/m9.figshare.19582801.v1
Who has a stake
No stake declared
No competing interests declared.
Journal
American journal of physiology. Regulatory, integrative and comparative physiology, 2022
Source
PubMed record 35785965. This page is based on the abstract only.

How much this study counts

  • ✓Randomized: people were put into groups by chance, so the groups start out alike.
  • –Small: 47 people. Small trials can miss real effects or find chance ones.
  • –Short: 8 weeks. Longer-term effects are unknown.
  • ✓Measured the question itself: heart disease, blood pressure and death.
  • ✓No competing interests declared.
  • •Summarized from the PubMed abstract only. The full paper may hold details the abstract leaves out.

✓ Strength– Limit• Note

These points come from fixed rules about the type of study, its size and length, what it measured, and who has a stake. Every study on Digestery gets the same rules.

Where this study sits

Each dot is one on-topic paper on this question. Steps near the top answer the question more directly.

↑ Stronger evidence

  1. Trials in people: heart disease, blood pressure and death

    3

    3 benefit

    ↑ This study is the ringed dot

  2. Trials in people: other measures

    2

    1 benefit, 1 no difference

  3. Trials in people: lab tests or safety

    5

    2 benefit, 1 mixed, 2 no difference

  4. Population studies

    4

    4 benefit

  5. Blood levels and genes

    0

    None among the papers we read.

↓ Weaker evidence

  • Points to benefit
  • Mixed
  • No difference
  • No direction
  • Points to harm

How it fits with the other research

The short answer to “Does sauna use lower heart disease risk?”

Possibly, but not proven in trials.

Confidence: low. Based on 21 on-topic papers.

Read the full answer

Of the other 2 papers on the same step: 2 benefit. This one found benefit. It agrees with most of them.

  • Quoted in “What we found”: In a trial of 47 inactive adults, adding a 15-minute sauna after exercise for 8 weeks lowered systolic (top-number) blood pressure by 8.0 mmHg more than exercise alone.
  • Part of the finding “Blood pressure: reviews and trials disagree”.
  • Open item for a person: PMID 40611569 (heart rate variability, set off-topic) appears to be the same trial as Lee 2022; analyzed numbers differ (38 vs 47).

Other papers on the same step

See all 21 studies on this question

How this page was made

Label

First read of the abstract
Claude Sonnet
Independent second read
Claude Haiku
Differences settled
The reviewer corrected 1 field after reading the abstract. Claude Opus 5.5.
Headline
Claude Sonnet, from the checked study record. A script checked its numbers and wording.
Numbers
Checked against the abstract by a script
“How much this study counts”
Fixed rules, the same for every study
Source check by a person
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