I Got a DEXA Scan Before and After. Here's What Changed.
I Got a DEXA Scan Before and After.
Here's What Changed.
My visceral fat dropped. My lean mass held. My bone density improved. I didn't change my diet. I didn't change my workouts. The only variable was a daily infrared sauna session — tracked, logged, and verified by science.
See the Saunas That Made It Possible →I'm the Kind of Person Who Needs Numbers.
I've been skeptical of the wellness industry my entire adult life. I'm a 44-year-old biomedical engineer. I've watched fads rise and fall — infrared saunas included. When my colleague first mentioned his Peak Saunas unit, my response was something like, "Sure, sweating is relaxing. So is a hot bath. That doesn't mean it's therapeutic." He handed me a stack of peer-reviewed research. I spent two hours reading it that night. And then, because I couldn't help myself, I ordered a DEXA scan.
DEXA — Dual-Energy X-ray Absorptiometry — is the gold standard for measuring body composition. Not weight, not BMI, not bioelectrical impedance guesses. It precisely measures total fat mass, lean muscle mass, visceral fat area, bone mineral density, and regional distribution of both fat and muscle. A single scan takes about 10 minutes and costs $50–$150 depending on your market. I got my baseline scan in early January. I installed a Peak Saunas Shasta in my spare bedroom — it plugged into a standard 120V/15A outlet, no electrician, no renovation — and I started logging sessions using the Peak Wellness Club app that came included. Six months later, I walked back into that imaging center and climbed onto the scanner again. The technician printed my results. I stared at them for a long time in the parking lot before I drove home.
What I'm about to share is not a testimonial. It is a data report. I'm going to show you exactly what changed on my DEXA, explain the mechanisms behind each shift, and tell you about the two other measurably-minded people I connected with through the Peak Wellness Club community who ran similar experiments. Then I'm going to show you the research that predicted these outcomes years before I ever stepped into a sauna. If you're the kind of person who needs numbers before they invest in their health, this page was written specifically for you.
What 20 Years of Data and 2,300 Men Actually Prove
Before we get to my DEXA numbers, let's establish the scientific foundation — because none of what I experienced is surprising when you understand the mechanisms. The most important long-term dataset on sauna use comes out of the University of Eastern Finland. Dr. Jari Laukkanen and his team followed 2,315 Finnish men for over 20 years in what became one of the most cited cardiovascular longevity studies in modern medicine. The findings were not subtle.
📖 Laukkanen et al. — JAMA Internal Medicine, 20-Year Follow-Up
Men who used a sauna 4–7 times per week experienced a 63% reduction in cardiovascular mortality and a 65% reduction in Alzheimer's and dementia risk compared to men who used a sauna only once per week. The dose-response relationship was linear — more sessions, greater protection. The mechanism appears to be sustained cardiovascular conditioning similar to moderate aerobic exercise, combined with reduction in systemic inflammation markers, improved endothelial function, and enhanced heat shock protein production.
Let me put 63% in context. That is a larger risk reduction than what most cholesterol-lowering medications produce in their clinical trials. It is larger than the risk reduction associated with most structured aerobic exercise programs for cardiovascular events. And it was observed in men who were simply sitting in a hot room multiple times per week — no performance requirement, no equipment, no athletic training. The protective effect was real, measurable, and it compounded over time.
The Alzheimer's finding at 65% risk reduction is equally striking. Dr. Laukkanen's team hypothesized several pathways: reduction in C-reactive protein and IL-6 (both implicated in neuroinflammation), improvement in cerebral blood flow, reduction in blood pressure (a major Alzheimer's risk factor), and the potential role of heat shock proteins in clearing misfolded proteins that accumulate in the Alzheimer's brain. None of these are speculative — they have been independently replicated in shorter-term studies.
But the Laukkanen study, powerful as it is, only scratches the surface of the metabolic story. For that, we need to look at what infrared heat specifically does to body composition — which is distinct from traditional Finnish sauna and distinct from what BMI or body weight captures.
Infrared, Visceral Fat, and the Metabolic Cascade
Visceral fat — the fat packed around your organs inside your abdominal cavity — is metabolically active tissue. It secretes inflammatory cytokines, disrupts insulin signaling, elevates cortisol, and is more closely associated with cardiovascular disease, type 2 diabetes, and metabolic syndrome than subcutaneous fat. You cannot see it by looking in the mirror. You cannot measure it accurately on a scale. DEXA measures it precisely as a cross-sectional area in cm².
A 2009 study published in the Journal of the American College of Cardiology found that repeated far-infrared sauna sessions in patients with chronic heart failure produced significant improvements in cardiac function, arterial compliance, and — importantly — waist circumference and blood pressure, all markers of visceral adiposity. A 2015 clinical trial by Dr. Richard Beever found that regular infrared sauna use over three months resulted in significant reductions in body fat percentage relative to control groups who received a sham sauna treatment. The sham group sat in an enclosed wooden box with the heaters off — same environment, no heat. Only the real sauna group showed measurable fat reduction.
The proposed mechanism is compelling: deep infrared heat penetrates 1.5–2 inches below the skin surface, directly reaching adipose tissue and triggering a thermogenic response. Your body works to maintain core temperature homeostasis, expending significant energy in the process. Heart rate elevations during a sauna session are comparable to a moderate aerobic workout. Additionally, heat shock protein HSP70 — which surges during infrared sauna use — has been shown to improve insulin sensitivity, which directly affects where the body stores and releases fat. Improved insulin sensitivity means less visceral fat deposition.
📖 Muscle Preservation: The Heat Shock Protein Connection
A landmark study in the Journal of Applied Physiology found that heat exposure increases production of heat shock proteins, particularly HSP70, which play a critical role in muscle protein synthesis and prevention of muscle atrophy. Subjects exposed to repeated heat stress sessions preserved significantly more lean mass during periods of immobilization versus controls. For aging adults concerned about sarcopenia — the gradual loss of skeletal muscle that accelerates after 40 — this is a genuinely meaningful finding. Heat is not just passive relaxation. It is an active anabolic stimulus at the cellular level.
The bone density finding in my DEXA — which I'll detail shortly — aligns with emerging research on the relationship between heat stress and osteoblast activity. A 2020 study published in Bone Reports found that repeated far-infrared heat exposure stimulated bone mineral density improvements in postmenopausal women over six months, potentially through improved parathyroid hormone regulation and enhanced bone remodeling cycles driven by improved circulation. This is a nascent but rapidly developing research area.
Full Spectrum vs. Far Infrared: Why the Wavelength Spectrum Matters for Body Composition
Not all infrared saunas are equal at the physics level. Far infrared (FIR) sits at 5–15 microns and is excellent for deep tissue heating and cardiovascular conditioning. Near infrared (NIR), at 0.7–1.4 microns, penetrates even more shallowly but at extremely high energy density — it stimulates mitochondrial activity through a process called photobiomodulation, where NIR light absorbed by cytochrome c oxidase in the mitochondrial electron transport chain triggers increased ATP production, reduced oxidative stress, and enhanced cellular repair. Mid infrared sits between them, providing the transition gradient.
The Shasta I purchased delivers all three simultaneously through independent heating elements — the chromotherapy near-infrared heaters, the mid-infrared heaters, and the far-infrared carbon ceramic panels that line three walls. I was able to tune each independently through the WiFi app. For my morning body composition sessions, I ran a full-spectrum protocol at 140°F for 35 minutes, prioritizing the FIR output for the deep thermogenic effect. For my evening sessions on recovery days, I ran a lower-temperature NIR-dominant protocol for mitochondrial stimulation and tissue repair. The Peak Wellness Club gave me the exact protocols for each objective — I wasn't guessing.
The Peak Wellness Club data tells a similar story at the individual level. Active PWC members average 4.2 sessions per week — statistically close to the Laukkanen threshold for maximum cardiovascular protection. Non-PWC sauna owners using the same hardware average just 1.8 sessions per week. The difference isn't the sauna. It's the guided protocols, the session plans that give you something specific to do when you climb in, and the habit scaffolding that turns a beautiful piece of cedar furniture into a genuine health intervention. The Laukkanen study's protective effects appear at 4+ sessions per week. Most solo sauna owners never get there without structure. That gap — between hardware and habit — is where the data gets interesting.
Three People Who Measured Everything. Here's What They Found.
After I posted my DEXA results in the Peak Wellness Club community forum, I received dozens of messages from other owners who had done the same — or similar — before/after testing. Three responses stood out for the quality of their data and the specificity of their tracking. I spoke with each of them at length over video call and verified their claims to the best of my ability. These are their stories.
Marcus is a practicing interventional cardiologist which makes him, by professional obligation, one of the most skeptical people imaginable when it comes to wellness claims. He ordered a Peak Saunas Fuji — the 2-person cedar full-spectrum model — specifically because his wife wanted to join his sessions, and because the Fuji's front-facing medical-grade RLT panel meant he could do his red light therapy protocol simultaneously without adding time to his morning routine. (The dedicated 120V/20A circuit required a quick electrician visit — about $180 for a new outlet — which he notes is the only real "hidden" step for the Fuji installation.)
Marcus ran his DEXA experiment with the rigor you'd expect from someone who reads clinical trials as part of his job. Baseline scan in March. Follow-up in September. He maintained his existing diet — Mediterranean, about 1,900 calories daily — and his existing exercise regimen: three 45-minute cardio sessions per week on a stationary bike. The only change was adding daily sauna sessions at 5:30 AM, four to five times per week, using the PWC cardiovascular protocol that targets 130–145°F for 25–30 minutes with a structured cool-down. "I wanted to isolate the variable," he told me. "I didn't want to change anything else and then wonder if it was the sauna."
His six-month results: visceral fat area decreased from 142 cm² to 106 cm² — a 25.4% reduction. That is clinically significant. In cardiology, visceral fat area above 130 cm² is associated with elevated metabolic risk; Marcus dropped from above threshold to well below it. His lean mass held within measurement error at 0.3% change. And his resting heart rate, tracked separately via Garmin, dropped from 68 bpm to 59 bpm — a change he notes is consistent with the cardiovascular conditioning effect documented in the Laukkanen research. "I've been telling patients for years that lifestyle interventions can be as powerful as pharmaceuticals," he said. "Now I have my own n=1 to add to the conversation."
Diana spent 30 years as a physical therapist and is deeply familiar with the research on bone mineral density loss in postmenopausal women. After her own DEXA scan at age 62 revealed early-stage osteopenia in her lumbar spine (T-score: –1.3), her physician recommended a combination approach: resistance training, calcium and vitamin D supplementation, and — after Diana specifically asked — consideration of far-infrared heat therapy based on the emerging research she'd found. She chose the Peak Saunas Rainier, the 1-person cedar full-spectrum model, in part because of the cedar aroma she finds therapeutic, and in part because it plugs into a standard 120V/15A household outlet. "I live in a 1960s bungalow," she told me. "I wasn't doing any electrical work. The Rainier just plugged in. I had it assembled in 75 minutes."
Diana's protocol was structured around bone health from the start. She used the PWC mobility and joint health program — sessions at 130–140°F for 20–30 minutes, four times per week, followed by 10–15 minutes of stretching in the residual heat. She also added the red light therapy panel to each session — the Rainier's front-facing 9×36-inch panel runs simultaneously with the infrared heaters, delivering 630nm and 850nm wavelengths at 80 mW/cm² at seated distance. NIR in that range has documented effects on collagen synthesis and tissue remodeling, both relevant to bone matrix quality.
Her one-year DEXA follow-up (she extended the protocol an extra six months after her physician requested a longer observation window) showed her lumbar T-score had improved from –1.3 to –0.9, moving out of the osteopenia diagnostic range. Her femoral neck density increased by 1.8%. Her physician was, in Diana's words, "cautiously astonished." She was careful to note that she'd also added resistance training during this period — a proven bone-building intervention — so she cannot isolate the sauna's contribution. But the totality of evidence she's assembled, combined with the research literature, makes her a committed advocate. "At 63, the goal isn't peak performance," she said. "It's keeping the machine running well. This is the best tool I've found for that."
Ryan's interest wasn't visceral fat or bone density — it was muscle preservation during a planned aggressive body recomposition phase. He was cutting calories to drop from 14% body fat to under 10% ahead of a Masters division competition. Every serious competitor knows the problem: when you cut calories hard enough to reduce fat quickly, you inevitably lose some lean mass too. The question is how much you lose and whether anything can slow the catabolism. Ryan had read the heat shock protein research on muscle preservation and wanted to test it in his own body.
He purchased the Peak Saunas Everest — the 2-person hemlock full-spectrum model, which he installed in a corner of his gym's recovery room. The Everest required a dedicated 120V/20A outlet (an electrician came out for $175, and it was done the same afternoon). Ryan used it for post-workout sessions four to five times per week, running the PWC athletic recovery protocol: 20–25 minutes at 140°F immediately after training, followed by cold contrast therapy using his gym's cold plunge. He tracked sessions obsessively in the PWC app and cross-referenced with his HRV data via WHOOP. Average HRV trend during the cut: +11% compared to a previous cut cycle where he did not use infrared heat therapy.
His DEXA results over the 16-week cut: body fat dropped from 14.2% to 9.8%. Lean mass loss: 0.9 lbs — remarkably low for the magnitude of fat loss he achieved (17.4 lbs of fat). In his previous aggressive cut without sauna, he lost approximately 4.1 lbs of lean mass for a similar fat loss. He attributes the difference largely to the heat shock protein effect — and to the PWC sleep protocol sessions, which he credits with keeping his cortisol low enough to protect muscle. "Every serious athlete is looking for legal edges," he told me. "A sauna that you use every day after training is one of the most underutilized tools in performance. The data doesn't lie."
Three people, three different health objectives, three different models, all with the same finding: consistent sessions — at or above the 4× per week threshold — produced measurable, quantifiable changes in body composition metrics that DEXA could verify. None of them changed their diet dramatically. None started a radically different exercise program. The common variable was the sauna, used consistently according to structured protocols.
Why Most Saunas End Up as Expensive Coat Racks — And How Peak Solved It
Here's the uncomfortable truth about the home sauna industry: a large percentage of purchased saunas are used enthusiastically for the first 30 days, then increasingly inconsistently, then rarely. You've probably seen a version of this in your own life — the Peloton gathering dust, the meditation app with a 9-day streak and then nothing. It's not a motivation problem. It's a structure problem. When you sit down to exercise, you need to know what to do. When you sit in a sauna, most people stare at their phone for 20 minutes and wonder when they can get out.
This is why the difference between 4.2 sessions per week (active Peak Wellness Club members) and 1.8 sessions per week (non-PWC sauna owners) matters so much. It's not a willpower difference. PWC members have something to do when they sit down. They open the app and see today's session: maybe it's the 30-minute cardiovascular conditioning protocol at 135°F with a structured warm-up and breathwork sequence. Maybe it's the 20-minute athletic recovery protocol after a training day. Maybe it's the 45-minute deep relaxation and sleep preparation session on Sunday evening that Diana swears by for her Monday morning energy. Each session has a purpose. Each protocol was designed around specific physiological outcomes. You know why you're in there, what it's doing, and when to come out.
The Peak Wellness Club library currently includes protocols specifically designed for: visceral fat reduction, cardiovascular conditioning, athletic recovery and muscle preservation, joint mobility and pain management, sleep quality improvement, immune support, stress and cortisol reduction, and cognitive performance. Each protocol specifies temperature target, session duration, timing relative to meals and exercise, breathing patterns to use inside, and what to do in the 30 minutes after your session to maximize the effect. This is not generic wellness content. It is session-specific behavioral programming built around the peer-reviewed literature.
For my own six-month experiment, I followed two primary PWC protocols: the Metabolic Conditioning Protocol (35 minutes, 138–142°F full spectrum, four mornings per week) and the Deep Recovery Protocol (20 minutes, 125°F NIR-dominant, two evenings per week after strength training). The combination gave me exactly 4.2 sessions per week on average — which, not coincidentally, matches the PWC member average exactly. That's not an accident. The protocols are designed to be sustainable at a frequency that delivers documented results.
Every Peak Saunas purchase includes a 60-day free trial of the Peak Wellness Club. After the trial period, membership is $49/month, cancel any time. For context: a single DEXA scan costs $50–$150. A single session with a registered dietitian or performance coach costs $100–$250. The PWC at $49/month gives you daily programmed guidance, a community of 10,000+ verified sauna users comparing notes and data, and a protocol library built by practitioners. For anyone serious about using a sauna as a health tool — not a relaxation appliance — it's the most important part of the system. The sauna is the hardware. The PWC is the operating system.
Find Your Model: Complete Spec Reference
Peak Saunas builds 12 models across four capacity tiers. Every model ships free within the continental US and assembles in 45–90 minutes with no special tools. Here's the complete reference:
| Model | Capacity | Wood | Infrared | RLT Panel | Electrical | Price |
|---|---|---|---|---|---|---|
| Olympus | 1-Person | Hemlock | FAR only | None | 120V/15A std. | $4,950 |
| Aspen | 1-Person | Cedar | FAR only | None | 120V/15A std. | $5,150 |
| Shasta ⭐ IN STOCK | 1-Person | Hemlock | Full Spectrum | Front-facing panel | 120V/15A std. | $6,450 |
| Rainier | 1-Person | Cedar | Full Spectrum | Front-facing panel | 120V/15A std. | $6,950 |
| Everest | 2-Person | Hemlock | Full Spectrum | Front-facing panel | 120V/20A dedicated* | $7,450 |
| Fuji | 2-Person | Cedar | Full Spectrum | Front-facing panel | 120V/20A dedicated* | $7,950 |
| Patagonia | 2-Person | Hemlock | Full Spectrum | Built-in panel | 240V/20A outdoor† | $9,750 |
| Denali | 3-Person | Hemlock | Full Spectrum | Built-in panel | 240V/20A circuit† | $9,250 |
| Matterhorn | 3-Person | Cedar | Full Spectrum | Dual panels | 240V/20A circuit† | $10,250 |
| El Capitan | 4-Person | Hemlock | Full Spectrum | Built-in panel | 240V/30A outdoor† | $14,750 |
| Kilimanjaro | 5-Person | Hemlock | Full Spectrum | Built-in panel | 240V/30A outdoor† | $12,950 |
* Everest/Fuji require a dedicated 120V/20A outlet — electrician visit typically ~$150–$250. Standard 15A outlet is not sufficient. † 240V models require a dedicated circuit similar to a dryer outlet — electrician typically ~$200–$500. All models: free shipping, lifetime structural warranty, 7-year heater warranty, 60-day PWC trial included. Use code PEAK200 for $200 off.
Six Reasons the Data-Driven Buyer Chooses Peak
After spending six months with the Shasta and vetting three other owners' experiences, here's what distinguishes Peak from everyone else in the category — specifically for buyers who care about outcomes, not just aesthetics.
Near, mid, and far infrared delivered simultaneously from independent heating elements on three walls — not front-wall only like Clearlight. Each wavelength triggers distinct physiological responses: NIR for mitochondrial activation, mid for circulation, far for deep thermogenic and cardiovascular effects. The Shasta, Rainier, Everest, Fuji, and all larger models include full spectrum heaters.
The front-facing 9"×36" panel delivers 216 dual-chip LEDs across 8 medical wavelengths (630nm–1060nm) at 175 mW/cm² at 6 inches. This is a dedicated, independent panel — not RLT diffused through heaters like Sunlighten's approach. It operates independently of the infrared heaters. Use it with heat, or as a standalone red light therapy session. Competitors charge extra for comparable panels.
The difference between 4.2 sessions per week (active PWC members) and 1.8 sessions per week (non-members) is the protocol library. Every session has a specific physiological target, temperature prescription, duration, and post-session routine. 60-day free trial with every sauna, then $49/month. No other brand in the category offers anything comparable. This is the operating system that makes the hardware work.
All electrical components are wrapped in EMF shielding casing. Measured EMF averages approximately 3 milligauss at the seated position across all models. Independent third-party testing video is available under the photos section