A cryochamber is a walk-in enclosure that exposes your body to extremely cold air, typically between −100°C and −140°C (roughly −148°F to −220°F), for two to four minutes at a time. The idea is that this brief blast of extreme cold triggers a cascade of physiological responses, from constricting blood vessels and dampening inflammation to releasing endorphins, that collectively promote recovery and reduce pain. Cryochambers have become fixtures in professional sports facilities, rehabilitation clinics, and commercial wellness centers, though the science behind some of their marketed benefits is still catching up with the hype.
The Room Itself and What a Session Looks Like
There are two main designs. A whole-body cryotherapy (WBC) chamber is a room large enough for one or several people to stand in, with their entire body, head included, enclosed in the cold environment. The air is cooled either by liquid nitrogen evaporation or by an electrical refrigeration system. The second type, sometimes called a cryosauna or cryocabin, is an upright pod that surrounds the body from the neck down, leaving the head exposed to room-temperature air. Both achieve similar temperature ranges, but the whole-body chamber is considered the more controlled environment because it cools the head and extremities uniformly.
Before stepping in, you strip down to minimal clothing: underwear or shorts, socks, gloves, and sometimes a headband or face mask to protect ears and nose. No jewelry, no wet clothing, no lotions. Sessions run short, usually two to three minutes. An attendant monitors you the entire time, and you can leave at any point. The air inside feels shockingly cold for the first thirty seconds or so, then the sensation stabilizes into an intense but tolerable chill. Most people describe a tingling, prickling feeling over the skin that fades quickly once they step out.
What Happens to Your Body in Extreme Cold
The moment cold air hits your skin, your sympathetic nervous system kicks in. Blood vessels near the skin’s surface constrict rapidly, a reflex called vasoconstriction, which redirects blood away from the extremities and toward your core organs to protect brain and heart function.1PubMed Central. Cold exposure and human metabolism: A heterogeneous response across tissues and organs Skin temperature plummets. One study comparing a −110°C cryochamber session to cold-water immersion at 8°C found that average skin temperature dropped by about 12°C after the chamber session, and the skin was significantly colder immediately afterward than after the cold water treatment.2PubMed Central. Muscle, skin and core temperature after -110°c cold air and 8°c water treatment Despite that dramatic surface cooling, core body temperature barely budges during a typical session. Air transfers heat much less efficiently than water, so the cold stays mostly at skin level.
Once you step out and begin warming up, the process reverses. Blood vessels dilate, and a rush of oxygen-rich blood flows back to the peripheral tissues. This vasoconstriction-vasodilation cycle is thought to improve local perfusion and oxygenation while flushing metabolic waste products.3PubMed Central. Synergistic CO2 Cryotherapy and EGF Delivery for Accelerated Wound Healing Through Anti-Inflammatory and Regenerative Pathways At the same time, the sympathetic nervous system activation triggers a release of noradrenaline and beta-endorphins.4PubMed Central. Effect of whole body cryotherapy on low back pain and release of endorphins and stress hormones in patients with lumbar spine osteoarthritis Noradrenaline is both a stress hormone and a neurotransmitter tied to alertness and mood, which partly explains the energized, almost euphoric feeling many people report after a session. Beta-endorphins are the body’s own painkillers. Together, these neurochemical shifts are the foundation for most of the claims made about cryochamber therapy.
Inflammation and Immune Signaling
The strongest area of research involves cryotherapy’s effect on inflammatory markers. A meta-analysis pooling data from eleven randomized controlled trials found that people who underwent whole-body cryotherapy had lower blood levels of IL-1β, a pro-inflammatory signaling molecule, compared to control groups. At the same time, levels of IL-10, an anti-inflammatory molecule, were higher in the cryotherapy groups.5PubMed Central. Whole-body cryotherapy can reduce the inflammatory response in humans: a meta-analysis based on 11 randomized controlled trials In simpler terms, cryotherapy appeared to turn down the signals that drive inflammation and turn up the ones that calm it. The meta-analysis also noted that athletes seemed to benefit more from the reduction in IL-1β, while people with obesity saw a stronger boost in anti-inflammatory IL-10.
These shifts matter clinically because chronic, low-grade inflammation underlies many conditions, from joint pain to metabolic syndrome. In patients with ankylosing spondylitis, a form of inflammatory spinal arthritis, cryotherapy at various temperatures led to significantly decreased disease activity scores and lower levels of the inflammatory marker IL-8.6PubMed Central. The Effect of Whole-Body Cryotherapy at Different Temperatures on Proinflammatory Cytokines, Oxidative Stress Parameters, and Disease Activity in Patients with Ankylosing Spondylitis For rheumatoid arthritis patients, a course of cryotherapy combined with rehabilitation reduced disease activity, morning stiffness, and pain intensity. The group that received cryotherapy also showed a statistically meaningful improvement in C-reactive protein, a broad marker of systemic inflammation, that the rehabilitation-only group did not.7PubMed Central. Effects of whole body cryotherapy in patients with rheumatoid arthritis considering immune parameters Both cold and heat therapies have a long history as non-drug options for osteoarthritis and rheumatoid arthritis, manipulating local temperatures to reduce symptoms and support functional recovery.8Fundamental Research. Cryotherapy and thermotherapy in the management of osteoarthritis and rheumatoid arthritis
Athletic Recovery and Muscle Soreness
Professional athletes were among the earliest adopters of cryochambers, using them primarily to manage the delayed-onset muscle soreness (DOMS) that follows hard training. A randomized controlled trial that tested multiple cryosauna sessions after fatigue-inducing exercise found that cryotherapy reduced blood biomarkers of muscle damage and lowered muscle stiffness. The development of DOMS, measured by increasing muscle stiffness after exercise, was blunted within the first 48 hours.9PubMed Central. Multiple cryosauna sessions for post-exercise recovery of delayed onset muscle soreness (DOMS): a randomized control trial
The blood markers tell a consistent story across multiple studies. Myoglobin and creatine kinase (CK) are proteins that leak out of damaged muscle fibers into the bloodstream after strenuous exercise. In young women who received cryotherapy before eccentric exercise, myoglobin levels were lower one hour after the second exercise bout, and CK activity was lower 24 hours later, compared to a control group.10PubMed Central. Pre-exercise cryotherapy reduces myoglobin and creatine kinase levels after eccentric muscle stress in young women A pilot study of downhill running, another exercise model that reliably causes muscle damage, found that plasma CK rose significantly after 24 hours only in the non-cryotherapy condition. The cryotherapy group’s CK increase was not statistically significant, and their blood calcium levels, another indicator of muscle membrane disruption, stayed more stable as well.11Revista Andaluza de Medicina del Deporte. Effects of cryotherapy on muscle damage markers and perception of delayed onset muscle soreness after downhill running: A Pilot study
All of this sounds compelling, but a critical caveat emerged from a study that compared whole-body cryotherapy, cold-water immersion, and a placebo treatment (a room kept at a thermoneutral temperature that participants were told was a “cryotherapy” session at a milder dose). Neither cryotherapy intervention outperformed the placebo at accelerating recovery after heavy resistance training.12PubMed. Whole body cryotherapy, cold water immersion, or a placebo following resistance exercise: a case of mind over matter? The researchers suggested that expectation and belief play a real role in perceived recovery. That does not mean the biomarker changes are imaginary, but it does mean the subjective experience of feeling better after a cryochamber session may owe something to the dramatic ritual of stepping into sub-zero air.
Mood, Depression, and the Brain
The endorphin and noradrenaline surge triggered by cold exposure has led researchers to test cryochambers as an add-on treatment for depression. A preliminary report studying patients with depressive disorders found that scores on a standard depression rating scale were significantly lower after a course of whole-body cryotherapy. Nearly every individual symptom dimension improved, with the exception of day-to-night mood fluctuations, and every single patient in the study showed lower depression scores after treatment.13PubMed. Influence of whole body cryotherapy on depressive symptoms – preliminary report
A subsequent randomized controlled trial tested cryotherapy specifically as a supplement to standard antidepressant medication. The cryotherapy group reported significant improvement in self-assessed mood compared to the control group. However, the same trial found no significant changes in self-assessed vitality or sleep quality.14PubMed Central. Efficacy of the Whole-Body Cryotherapy as Add-on Therapy to Pharmacological Treatment of Depression—A Randomized Controlled Trial So while the mood-lifting effect appears to be real and replicable, it does not extend to all aspects of well-being evenly. The mechanism is probably a combination of the noradrenaline boost and the endorphin release already described, plus possible effects on cortisol regulation, though the precise pathways remain under investigation.
It is worth emphasizing that these studies position cryotherapy as an add-on to existing treatment, not a replacement. No one is suggesting that a few minutes in a cold room can substitute for antidepressant medication or psychotherapy. But for people already receiving treatment who want an additional tool, the early evidence is encouraging.
Skin and Aesthetic Claims
Commercial cryochamber facilities frequently market sessions as beneficial for skin tone, collagen production, and anti-aging. The evidence here is thin. A prospective study that measured skin parameters in young, healthy women after ten whole-body cryotherapy sessions found no meaningful improvement in skin elasticity. The researchers specifically tracked indices related to collagen and elastin fiber integrity and found they remained stable throughout the treatment course. One explanation offered was that young, healthy skin already maintains elasticity at a naturally high level, leaving little room for improvement. The researchers also noted that ten sessions may simply not be enough to change the skin’s mechanical structure.15PubMed Central. A prospective study on the effects of 10 whole-body cryotherapy sessions on skin parameters in young healthy women An important positive finding from that study was that despite decreased epidermal hydration after sessions, the deeper structural integrity of the skin was fully preserved, meaning cryotherapy at least does not appear to damage healthy skin.
A broader review of whole-body and partial-body cryotherapy in aesthetic dermatology put it bluntly: many of the advertised claims have little, if any, scientific evidence behind them.16PubMed. Whole- and partial-body cryotherapy in aesthetic dermatology: Evaluating a trendy treatment That does not mean the claims are false; it means the studies to prove or disprove them mostly have not been done to a rigorous standard. The temporary glow people notice after a session is almost certainly just the post-cold vasodilation flushing the skin with blood, not a lasting structural change.
Weight Loss and Metabolic Effects
Another common marketing claim is that a single cryochamber session burns hundreds of calories because your body has to work hard to rewarm itself. The reality is more modest. Your metabolic rate does increase during and shortly after exposure, but the total extra energy expenditure from a two- to three-minute session is small. One study did find that whole-body cryotherapy was effective at reducing abdominal obesity in menopausal women with metabolic syndrome, but that involved a structured protocol, not isolated drop-in sessions.17PubMed Central. Whole-Body Cryotherapy Is an Effective Method of Reducing Abdominal Obesity in Menopausal Women with Metabolic Syndrome The anti-inflammatory effects of cryotherapy may indirectly support metabolic health by reducing the chronic inflammation associated with obesity and insulin resistance, but expecting meaningful weight loss from cryochamber visits alone is unrealistic.
Safety Risks and Contraindications
Short, supervised sessions are generally safe for healthy adults, but “generally safe” hides some real risks that deserve attention.
The most serious danger with nitrogen-cooled systems is oxygen displacement. Liquid nitrogen evaporates into a dense, cold gas that sinks and can push breathable air out of an enclosed space. In cryosaunas where the head stays above the chamber, this is managed by design. In fully enclosed walk-in chambers using nitrogen, proper ventilation and oxygen monitoring are critical. A Japanese analysis of oxygen concentrations during liquid nitrogen evaporation in an enclosed space showed that the distribution of low-oxygen zones depends on the density of the cold nitrogen gas settling toward the floor, reinforcing the need for real-time oxygen sensors and adequate airflow.18Journal of the Japanese Association of Refrigeration. The real-time analysis of oxygen concentrations in an enclosed space during the evaporation of a liquid nitrogen At least one death has been publicly reported in connection with a cryotherapy facility, linked to unsupervised use of a nitrogen-cooled unit.
A scoping review from an international consortium evaluated the broader safety profile. The strongest evidence of serious adverse effects involved vascular and neurological complications, including cases of intracerebral hemorrhage, a specific vascular brain condition, and abdominal aortic dissection. However, the review found that careful examination of these cases revealed significant pre-existing risk factors in the patients or inappropriate exposure parameters such as excessively long sessions or temperatures beyond safe limits.19PubMed Central. Evaluating safety risks of whole-body cryotherapy/cryostimulation (WBC): a scoping review from an international consortium In other words, the serious incidents were largely preventable and involved people who probably should not have been using cryochambers in the first place, or facilities that ran sessions outside accepted protocols.
People who should avoid cryochambers include those with:
- Uncontrolled hypertension: the sudden vasoconstriction can spike blood pressure dangerously.
- Cold-sensitive conditions: Raynaud’s disease, cold urticaria, or cryoglobulinemia can cause severe reactions to extreme cold.
- Cardiovascular disease: the sympathetic nervous system surge places extra stress on the heart and blood vessels.
- Open wounds or acute skin conditions: extreme cold on broken skin risks frostbite and tissue damage.
- Pregnancy: the systemic stress response is considered inappropriate during pregnancy.
- Seizure disorders: extreme cold can lower the seizure threshold in susceptible individuals.
Milder adverse effects include superficial cold burns, particularly on bony prominences or areas where the skin is thin. These typically heal without lasting damage but underscore why dry skin, proper clothing on extremities, and strict time limits matter.
The Regulatory Landscape
In the United States, the FDA has not cleared or approved any whole-body cryotherapy device for medical treatment of any condition. The agency issued a consumer safety statement in 2016 warning that claims about treating diseases were not supported by sufficient evidence and that the devices had not undergone the regulatory review process. This means that cryochamber facilities operate as wellness or recreational businesses, not medical providers. In Europe, regulation varies by country, and some nations have established more specific guidelines for cryotherapy chamber operation, including required temperature ranges, maximum session durations, and mandatory staff training.
The lack of FDA clearance does not necessarily mean cryotherapy is ineffective. It means the evidence has not been compiled into the kind of formal regulatory submission required for medical-device approval. Many of the individual findings described above are from peer-reviewed studies that show real biological effects. The gap is between “there are measurable effects on inflammatory markers and recovery biomarkers” and “there is enough large-scale, high-quality evidence to formally approve this as a medical treatment.” That gap may close over time as more and larger trials are completed, but for now, anyone considering cryotherapy should understand that they are choosing a wellness service, not a medically validated therapy.
Cryochambers Versus Ice Baths and Other Cold Therapies
A question many people have is whether a cryochamber does anything an ice bath cannot. The comparison is genuinely interesting because the two modalities cool the body in fundamentally different ways. Water conducts heat away from skin roughly 25 times faster than air at the same temperature, so an ice bath at 8-10°C is an aggressive thermal challenge. A cryochamber at −110°C sounds far more extreme on paper, but air’s poor thermal conductivity means the actual heat extracted from the body per minute is comparable, or sometimes less, than cold water immersion.
Skin temperature does drop more dramatically and more quickly in a cryochamber, as the study comparing −110°C air to 8°C water confirmed.2PubMed Central. Muscle, skin and core temperature after -110°c cold air and 8°c water treatment But water immersion produced greater reductions in deeper tissue temperature because it maintained contact and conduction over the full session. Practically, this means cryochambers may be better at triggering the rapid skin-level nerve response (the noradrenaline and endorphin cascade) while ice baths may penetrate deeper into muscle tissue. For people who find ice baths unbearably uncomfortable or who cannot tolerate the hydrostatic pressure of water immersion due to joint problems, the dry-air chamber offers a more tolerable alternative that still delivers measurable cold stress. Comfort and compliance count for something when the recommendation involves regular sessions over weeks.
How Sessions Are Typically Structured
If you visit a commercial cryotherapy facility, a standard protocol usually involves stepping into the chamber for an initial session of around 90 seconds to two minutes, building up over subsequent visits to three minutes at the lowest temperature the facility offers. Research protocols typically use ten to twenty sessions spread over two to four weeks for conditions like arthritis, depression, or metabolic syndrome. Single-session studies exist, but most clinical effects appear to require repeated exposure.
The timing matters, too. For athletic recovery, sessions are generally scheduled within an hour or two after training. For chronic inflammatory conditions, sessions tend to be spread evenly across the treatment window. Some research on pre-exercise cryotherapy suggests that cold exposure before a workout can reduce the subsequent muscle damage, which is a different application from using it to recover afterward.10PubMed Central. Pre-exercise cryotherapy reduces myoglobin and creatine kinase levels after eccentric muscle stress in young women Whether pre- or post-exercise timing works better for a given individual likely depends on the type and intensity of their training, and the research has not settled on a universal recommendation.
Pricing at commercial facilities ranges widely, from roughly $30 to $100 per session, with packages and memberships bringing the per-session cost down. The expense adds up quickly if you follow the kind of multi-week protocol used in clinical research. Insurance rarely covers cryotherapy since it is not FDA-approved for medical use, though some employers’ flexible spending accounts have been used creatively to cover it.