Key Takeaway
Moderate evidence supports far-infrared sauna use for blood pressure normalization and congestive heart failure treatment, with weaker evidence for chronic pain, fatigue, and obesity.
Summary
This review by Beever (2009) systematically examined the published evidence on far-infrared sauna (FIRS) therapy for cardiovascular risk factors and other health conditions. The author searched multiple databases including Web of Science, EBSCO, Ovid MEDLINE, Ovid HealthSTAR, and EMBASE to identify relevant human studies published in English.
The search yielded nine relevant papers meeting Level I or II evidence criteria. Four papers supported FIRS use for congestive heart failure, while five papers addressed various coronary risk factors. The evidence was categorized by strength: limited moderate evidence for blood pressure normalization and heart failure treatment, fair evidence from a single study for chronic pain management, and weak evidence from single studies for chronic fatigue syndrome and obesity.
Notably, the review found strong evidence contradicting manufacturer claims that FIRS therapy could reduce cholesterol levels. The author concluded that while FIRS shows promise for certain cardiovascular conditions, the overall evidence base remains limited and more rigorous research is needed.
Methods
- Systematic literature search of Web of Science, EBSCO, Ovid MEDLINE, Ovid HealthSTAR, and EMBASE
- Search terms: "far-infrared" and "sauna"
- Limited to human studies published in English
- Evidence graded by Level I or II criteria
- 9 relevant papers identified and reviewed
Key Results
- Limited moderate evidence for blood pressure normalization with FIRS
- Limited moderate evidence for congestive heart failure treatment
- Fair evidence (single study) for chronic pain management
- Weak evidence (single studies) for chronic fatigue syndrome and obesity
- Strong evidence against cholesterol reduction claims by manufacturers
- 4 of 9 papers supported FIRS for congestive heart failure
- 5 of 9 papers addressed coronary risk factors
Figures
Figure 1
Limitations
- Small number of included studies (only 9 papers)
- Many conditions supported by only single studies
- Limited to English-language publications
- Heterogeneity across study designs and populations
- Most evidence from Japanese research groups using Waon therapy protocol
- No long-term follow-up data available at time of review