HEALTHTECH PERFORMANCE TEST DRIVE: THE FAR INFRARED SAUNA

Dr. Leslie Valle-Montoya’s Early Findings and Vision for Integrative Wellness (Relax Sauna)

August 18, 2026

For Dr. Leslie Valle-Montoya, the evaluation of the Relax Far Infrared Sauna began not with enthusiasm, but skepticism. As a clinical professional already experienced with infrared sauna therapy, she was accustomed to substantial wooden sauna systems used in both personal wellness and patient care. When the portable Relax Sauna arrived, its comparatively simple construction did not immediately suggest a technological advance.

Her first impression was candid: “I don’t like this. I feel this is a cheap version of another sauna.” She questioned whether a lightweight portable system could provide anything comparable to the larger infrared units she had already incorporated into practice. That skepticism, however, changed after she began using the device.

A Different Thermal Experience

The first practical distinction Valle-Montoya identified was efficiency. Unlike her larger sauna, the Relax system did not require a lengthy preheating period. Heat was apparent quickly after activation, while the operating temperature she cited was comparable to that of her wooden sauna—approximately 140°F. More important from a clinical workflow perspective was the shortened treatment period. In her experience, the portable sauna produced an intense thermal response within approximately 20–30 minutes, whereas longer sessions had traditionally been required with her conventional unit.

“If we can cut people’s time almost in half and still get the same or probably better benefit out of it,” she observed, “it is game changer.”

For a wellness practitioner, this is not simply a convenience issue. Treatment time affects patient compliance, scheduling, clinical throughput and the ability to combine thermal therapy with other components of a structured wellness program. A technology capable of generating a meaningful physiological response in a shorter period could potentially make regular sauna use more practical for patients who would otherwise resist a 45- or 60-minute commitment.

Valle-Montoya described the distinction in unusually clinical terms. Her traditional box sauna, she explained, was relaxing, soothing and beneficial. The Relax Sauna felt different to her—what she called “medicinal.” By that description, she was referring to the immediacy of the physiological experience: increased sweating, changes in heart rate and a sensation of active thermoregulation occurring considerably earlier in the session.

From Patient Experience to Measurement

Perhaps the most important feature of Valle-Montoya’s evaluation is that she does not want the assessment to end with subjective experience. Her larger clinical philosophy is based on an increasingly important question in integrative health technology: Can the physiological effects of a wellness intervention be measured?

At the time of the interview, she reported experience with approximately ten participants using the Relax Sauna, including individuals who had also used her conventional box sauna. Her developing evaluation model incorporates measures such as OligoScan assessment, heart-rate variability and other before-and-after indicators. She specifically described using OligoScan in her practice to follow heavy metals and mineral status.

Her preliminary observations intrigued her. She described one participant showing what she characterized as a small shift in mercury and aluminum after approximately three weeks of sauna use, and another long-term detoxification patient demonstrating a more pronounced change during the period in which the Relax Sauna was incorporated. Valle-Montoya was careful in the interview to describe these as early observations rather than the conclusion of a controlled clinical study. Nevertheless, they were sufficiently interesting to motivate her to pursue a more formal next phase.

This distinction is important. The clinical value of these early experiences lies less in declaring what the sauna has already “proven” than in identifying what should now be tested.

Building a Measurable Detoxification Program

Detoxification is one of the areas in which Valle-Montoya sees the greatest potential for integration. Rather than treating sauna use as an isolated wellness amenity, she envisions thermal therapy as one component within a broader protocol involving hydration, mineral support, recovery and objective monitoring.

Her future research interest is particularly ambitious: measuring environmental toxicant burden before an intervention, implementing a defined detoxification protocol incorporating far-infrared sauna, and then repeating the measurements afterward. She specifically expressed interest in studying heavy metals, PFAS and microplastics. “I want to be able to measure people’s environmental toxicities,” she explained, including “not only PFAS, not only heavy metals, but microplastics.” Her proposed model is straightforward: establish a baseline, implement the protocol and measure again. If measurable movement can be demonstrated, she believes the implications for accessible detoxification programs could be substantial.

Importantly, such a study would be needed before claims about removal of these substances could be established. Valle-Montoya’s interview therefore points toward a research hypothesis—not yet a clinical conclusion.

The “Dirty Towel” Observation

One of her most visually striking observations involved the white towels she intentionally places inside the sauna during each session. Valle-Montoya has repeatedly noticed dark or black discolorations appearing on the towels after use, across multiple patients—an occurrence she says she has not observed with the same frequency or intensity in her other sauna systems. While the source of these markings remains unknown, their recurring appearance has captured her clinical interest and raises an important question for further investigation: What exactly are these dark residues, and what might their presence reveal about the physiological processes occurring during far-infrared sauna therapy?

Scientifically, that qualification matters. Visible residue cannot simply be identified as a particular toxin without laboratory analysis. Yet the observation provides another testable question: What exactly is present in perspiration and residue collected during these sessions, and does its composition change over repeated treatments? That question could transform an anecdotal observation into a meaningful analytical investigation.

Cardiovascular Response, Recovery and Clinical Programming

Valle-Montoya also sees opportunities beyond detoxification. She reported monitoring changes in heart rate and heart-rate variability and compared the thermal response to aspects of cardiovascular exercise. In her view, the clinical story should include not only the stress induced by heat, but the body's subsequent adaptation and recovery.

“You also have to have recovery after thermoregulation in your body,” she emphasized, while underscoring hydration as an essential part of responsible sauna use.

This creates opportunities for the technology to be incorporated into broader clinical programs rather than being positioned solely as a “detox sauna.” Depending upon the patient and appropriate clinical oversight, Valle-Montoya’s model suggests studying the technology within wellness, recovery, metabolic, cardiovascular-conditioning and environmental-health programs. Its relatively short treatment window could also make it easier to pair sauna exposure with complementary assessments and therapies during a single visit.

The broader significance is programmability: sauna becomes not the program itself, but a therapeutic component within a measurable clinical pathway.

From Wellness Technology to Clinical Evidence

Valle-Montoya’s approach reflects a larger evolution occurring within integrative health. Emerging wellness technologies increasingly require more than testimonials. Practitioners need protocols, baselines, physiological endpoints, repeat measurements and reproducible observations.

That mindset is evident elsewhere in her work. In discussing other frequency-based technologies, she proposed dark-field microscopy and bioimpedance analysis as potential methods for examining before-and-after biological changes, including cellular vitality and phase angle. The same philosophy informs her interest in far-infrared sauna: observe the response, measure what can be measured, identify what remains unknown, and design the next investigation accordingly.

The Relax Sauna therefore appears to have moved, in Valle-Montoya’s assessment, from an initially unimpressive portable device to a technology worthy of deeper clinical evaluation. Its rapid heat delivery, shorter treatment window, pronounced perspiration response and potential compatibility with measurable wellness and detoxification protocols have earned her attention.

The next step is evidence. For Valle-Montoya, that means moving beyond whether a patient simply “feels better” after a sauna session. It means asking whether environmental markers change, whether physiological adaptation can be documented, whether responses differ from conventional infrared systems, and whether those findings can be reproduced across a larger population.

That is ultimately where her contribution to the HealthTech Reporter Clinical Evaluation & Performance Review becomes most valuable. She is not merely evaluating whether the Relax Far Infrared Sauna is comfortable or convenient. She is beginning to ask the more consequential clinical question:

What can this technology become when it is incorporated into a structured program, subjected to measurement, and evaluated as part of a modern evidence-building model for wellness, detoxification and progressive clinical care?