Whole Body Cryotherapy: Before and After What to Expect

Whole-body cryotherapy involves standing in a chamber cooled to roughly minus 110 °C for two to three minutes, and the experience unfolds in distinct phases that start well before you step inside and continue for an hour or more after you leave. Your skin temperature plummets within seconds, your nervous system fires off a cascade of responses, and the rewarming period afterward is where most of the claimed benefits actually play out. The science behind those claims is a mix of genuinely interesting physiology and marketing that outpaces the evidence, so knowing what to realistically expect can help you decide whether a session is worth your time and money.

Preparing for Your First Session

Most cryotherapy facilities ask you to arrive dry and remove any jewelry, watches, or metal piercings. You’ll typically strip down to underwear or shorts and be given gloves, socks, and slippers to protect your extremities from frostbite. Some clinics provide a face mask or headband. Moisture is the main concern beforehand: sweat or damp skin conducts cold faster and raises the risk of skin burns, so showering right before a session and then toweling off completely is standard advice. Avoid applying lotions, oils, or creams, since they can trap moisture against the skin.

You should also know the difference between two types of setups. A true whole-body cryotherapy chamber encloses your entire body, head included, in cold air. A partial-body cryounit (sometimes called a cryosauna) is an open-top cylinder where your head sticks out and vaporized liquid nitrogen cools the space around your torso and limbs. These two are frequently confused in both marketing and research, which muddies the evidence.

What Happens to Your Body During the Two to Three Minutes

The moment cold air hits your skin, surface temperature drops fast. In a randomized trial measuring skin responses in real time, researchers found a significant decrease in mean skin temperature starting at just 30 seconds of exposure, and that decline continued through the full session.¹ The lowest readings tend to show up on the forearms and calves, where there’s less insulating tissue.²

Your core temperature, however, barely budges while you’re inside. Rectal temperature does not change during a two-minute exposure.² This is an important distinction: the cold is acting on your skin and the nerve endings embedded in it, not chilling your organs. Blood vessels in the skin and subcutaneous tissue constrict rapidly, which is why your skin may look pale or flushed in patches when you step out. Heart rate tends to tick up modestly during or immediately after the session. One study of non-professional athletes found heart rate rose from about 51 beats per minute to roughly 57 beats per minute, while systolic blood pressure stayed essentially unchanged and oxygen saturation held steady.³

Subjectively, the first 30 seconds feel intense. Many people describe a sharp, stinging cold on exposed skin that settles into a deep, numbing ache. Breathing can feel momentarily restricted because cold air triggers a reflexive gasp. By about the 90-second mark, the numbness is usually well established, and the remaining time feels more tolerable than the opening seconds.

The Rewarming Phase and Why It Matters

What happens after you leave the chamber is, from a physiological standpoint, more interesting than what happens inside it. Once you step into room-temperature air, blood vessels in your skin dilate rapidly. Skin temperature begins climbing back toward normal, but muscle and core temperature actually continue to drop for up to an hour. A study comparing whole-body cryotherapy to cold-water immersion found the greatest reductions in muscle temperature at depths of one to three centimeters occurred about 60 minutes after the session, not during it.⁴ Rectal temperature also showed a small, gradual decline after the session ended.²

This delayed internal cooling helps explain why the post-session window feels distinctive. People commonly report a rush of alertness, mild euphoria, and a tingling warmth spreading through their limbs as the rewarming kicks in. Part of this is driven by norepinephrine: research on repeated cold exposures found that norepinephrine levels spiked two- to threefold after each session, and this response persisted without fading over a 12-week period.⁵ Norepinephrine is involved in attention, mood, and vasoconstriction, so a surge of it after a session lines up with the “energized” feeling many people describe.

Another finding from that same study is worth noting: cortisol and ACTH levels actually decreased over repeated weeks of exposure, suggesting the stress-hormone axis habituates rather than staying chronically activated.⁵ In other words, your body learns to treat the cold as a manageable stressor rather than a crisis, while still producing the norepinephrine spike each time.

What the Evidence Says About Muscle Recovery

Faster recovery from exercise-induced muscle damage is the flagship claim for cryotherapy in sports, and the evidence here is genuinely mixed. On one hand, a randomized controlled trial found that multiple cryosauna sessions after a damaging exercise bout reduced creatine kinase activity (a marker of muscle damage) and kept muscle stiffness lower compared to a control group for the first 48 hours.⁶ Another trial in young women found that pre-exercise cryotherapy lowered myoglobin and creatine kinase after eccentric muscle stress.⁷ And there’s evidence that a single cryotherapy session after strenuous running suppressed the inflammatory marker IL-1β and limited the rise in C-reactive protein for up to 48 hours.⁸

On the other hand, a Cochrane systematic review concluded there is insufficient evidence to determine whether cryotherapy reduces self-reported muscle soreness or improves subjective recovery compared to passive rest.⁹ The confidence intervals in the pooled data were wide enough that the true effect could be zero or could even favor doing nothing.¹⁰ A study of highly trained runners after a simulated trail race found no difference in creatine kinase activity between cryotherapy, far-infrared treatment, and passive recovery at any time point measured.¹¹

The honest takeaway: some individual trials show real reductions in blood markers of damage and inflammation, but when you zoom out to the systematic-review level, the effect on what actually matters to you (how sore you feel, how quickly you can train again) is uncertain. If you try cryotherapy and feel like you recover faster, that subjective benefit is real for your experience, but the blood work alone does not guarantee you’ll feel meaningfully better than you would with rest.

How It Compares to a Plain Ice Bath

Cold-water immersion and whole-body cryotherapy are often spoken about as interchangeable, but they cool the body differently. Water conducts heat about 25 times more efficiently than air, so even though a cryotherapy chamber is far colder (minus 110 °C vs. roughly 8 to 10 °C water), the actual reduction in muscle temperature is similar between the two methods.⁴ The skin gets colder after cryotherapy than after an ice bath, but muscle and core temperature end up in the same neighborhood.

When researchers have compared the two head-to-head for exercise recovery, cold-water immersion has generally come out equal or slightly ahead. After a marathon, one trial found that cryotherapy actually had a harmful effect on muscle function compared to cold water, though subjects in the cryotherapy group reported feeling better about their training stress.¹² Another trial after resistance exercise found that cryotherapy reduced soreness at 24 hours and improved peak force at 48 hours compared to cold water, but many other outcomes were trivial or favored the placebo condition.¹³ A direct comparison study found cold-water immersion was more effective for restoring jump performance at 72 hours and produced lower soreness and higher perceived recovery than cryotherapy across the first two days.¹⁴

The practical implication is straightforward: if your main goal is physical recovery and you have access to both options, an ice bath is cheaper, available at home, and performs at least as well by most measures. Where cryotherapy has an edge is convenience and tolerance. Sessions are shorter, you stay dry, and the subjective experience is often described as less grueling than sitting in ice water for 10 to 15 minutes.

The Weight-Loss Question

Many cryotherapy studios promote sessions as a calorie-burning tool, sometimes claiming you can burn 500 to 800 calories per visit. The physiology behind the claim has a kernel of truth: extreme cold triggers shivering and activates brown adipose tissue, which burns energy to generate heat. A study measuring ventilatory responses found that oxygen consumption spiked after a single session, with metabolic equivalents increasing by about 1.0 compared to a control condition. But that spike was short-lived, with values returning close to resting levels within about a minute after exiting the chamber.¹⁵ A brief metabolic bump lasting under a minute does not add up to hundreds of calories.

The most rigorous test of the weight-loss claim came from a clinical trial that combined cryotherapy sessions with a conventional obesity management program and compared the results to the same program without cryotherapy. The result was clear: cryotherapy did not significantly enhance weight loss, did not activate brown adipose tissue beyond what the standard program achieved, and did not alter most metabolic responses.¹⁶ One study in menopausal women with metabolic syndrome did report reductions in abdominal obesity after cryotherapy, but that population has specific hormonal and metabolic characteristics, and the study framed cryotherapy as potentially useful alongside other interventions rather than as a standalone weight-loss method.¹⁷ If you’re going into a cryotherapy session expecting it to replace a workout’s worth of calories, the evidence says you’ll be disappointed.

Mood, Anxiety, and Sleep

The mental-health effects of cryotherapy are, surprisingly, among the better-supported claims. A randomized controlled trial adding cryotherapy to standard antidepressant treatment in people with depression found statistically significant improvements in depressive symptoms, quality of life, and self-assessed mood compared to medication alone. The study did not find improvements in sleep or sexual satisfaction.¹⁸ A meta-analysis pooling results from multiple studies reported a medium between-group effect size for mental health problems overall, and a large within-group effect for depressive symptoms specifically, though heterogeneity across the included studies was high.¹⁹

On the sleep side, a study in healthy young adults found that repeated cryotherapy sessions improved subjective sleep quality and increased slow-wave sleep duration by an average of about seven minutes per night. The improvements in mood and anxiety were more pronounced in women than in men.²⁰ The norepinephrine surge discussed earlier likely plays a role here, since norepinephrine is involved in regulating arousal, and the pattern of habituation in the stress-hormone response may contribute to a general calming effect over repeated sessions.

These results are encouraging but not definitive. Most of the studies are small, and the high heterogeneity in the meta-analysis means the true effect size could be considerably smaller than the pooled estimate suggests. Still, if you walk out of a cryotherapy session feeling mentally sharper and calmer, that aligns with what the physiology and the preliminary clinical data would predict.

Fibromyalgia and Chronic Pain

One area where cryotherapy has attracted serious clinical interest is fibromyalgia. Three separate randomized trials have tested cryotherapy in fibromyalgia patients, and all three reported significant pain reductions. One trial found that pain scores dropped substantially in the cryotherapy group while staying flat in the control group, and the treated group also showed broad improvements in an inventory covering emotional, physical, and coping dimensions of the disease.²¹ Another found significant pain reduction persisting at one month after treatment, along with improved functional mobility.²² A third reported improved health-related quality of life lasting at least one month post-intervention.²³

The consistency across trials is notable, though all were relatively small. The mechanism likely involves the analgesic properties of cold exposure combined with the anti-inflammatory shifts and neuroendocrine changes that occur during and after sessions. Researchers in this space frame cryotherapy as a potential adjunct therapy rather than a replacement for existing fibromyalgia management, but for a condition where treatment options are notoriously limited, even a modest adjunct is worth paying attention to.

What Changes Over Multiple Sessions

A single cryotherapy session produces measurable but transient effects: a norepinephrine spike, a brief metabolic bump, temporary skin cooling, and shifts in inflammatory markers that resolve within a day or two. Repeated exposure seems to produce a somewhat different picture. After ten sessions, one study found a significant increase in white blood cell count, particularly lymphocytes and monocytes, along with elevated levels of the cytokine IL-6.²⁴ This suggests an immune-mobilizing effect that builds over time, though whether that translates into fewer colds or better immune surveillance remains unknown.

Meanwhile, the cardiovascular system also shows a separate response with one exposure and another with a different study measuring broader hemodynamic effects. One paper found that cryotherapy stimulated the baroreceptor reflex, leading to decreased heart rate and cardiac output with increased stroke volume and peripheral resistance immediately afterward.²⁵ That’s essentially the cardiovascular system adjusting to redirect blood flow inward, and it appears to resolve within a normal time frame. These cardiovascular changes are generally well tolerated in healthy individuals, but people with cardiovascular conditions need careful screening, since the cold strongly modulates the system and the response profiles can differ between healthy people and those with conditions like hypertension.²⁶

Who Should Skip It

Cryotherapy is not for everyone, and the list of standard contraindications is worth taking seriously:

Uncontrolled hypertension: The blood-pressure and vascular responses to extreme cold can be unpredictable in people whose baseline cardiovascular regulation is already compromised.
Cold-induced conditions: Raynaud’s disease, cold urticaria (hives triggered by cold), and cryoglobulinemia are obvious disqualifiers.
Recent heart attack or stroke: The acute cardiovascular stress, even though brief, is inadvisable in the early recovery window.
Pregnancy: There is no safety data, so clinics universally exclude pregnant clients.
Open wounds or acute skin infections: Extreme cold on broken skin can cause tissue damage.
Severe anemia or seizure disorders: The sudden cold stimulus can trigger adverse events in susceptible individuals.

A review from an international consortium specifically flagged the confusion between true whole-body cryotherapy chambers and partial-body cryounits that use vaporized liquid nitrogen. Some reported adverse events, including cases of nitrogen asphyxiation, have involved the partial-body units, where the user’s head is exposed to the ambient room air while their body sits in a nitrogen-cooled cylinder. The safety profiles of the two setups are not interchangeable.²⁷ If you’re booking a session, confirming which type of unit the facility uses is a reasonable question to ask up front. Cardiovascular responses in healthy people are well tolerated, but careful assessment of contraindications is always warranted.²⁸

What the Immune System Actually Does

One of the more interesting findings in the cryotherapy literature is what does not happen: inflammatory cytokines like IL-1β, IL-6, and TNF-α did not increase after cold exposure in a 12-week study of healthy women, contradicting the assumption that extreme cold might trigger a systemic inflammatory response.⁵ This is relevant because it suggests that repeated cryotherapy does not chronically inflame you, even though a single session after strenuous exercise can modulate the inflammatory response in a favorable direction by suppressing pro-inflammatory markers and boosting anti-inflammatory ones.⁸

The distinction matters for anyone considering regular cryotherapy as part of a wellness routine. The cold is not triggering a harmful stress cycle that compounds over time. The stress-hormone data shows the opposite: the hypothalamic-pituitary-adrenal axis quiets down with repeated exposure while the norepinephrine response stays robust. Your body essentially learns to treat the cold as a specific, localized challenge rather than a whole-system alarm, which is a pattern consistent with how healthy adaptation to repeated stressors generally works.