Cryotherapy and cold plunges are not the same thing, though they share the same basic principle: using extreme cold to trigger beneficial responses in your body. The key difference is the medium. Cryotherapy exposes you to ultra-cold air (often below -200°F) inside a chamber for two to four minutes, while a cold plunge submerges your body in cold water, typically between 38°F and 59°F, for anywhere from two to fifteen minutes. That distinction between air and water changes how deeply the cold penetrates, how your body responds, and which method works better for specific goals.
How Each Method Works
Whole-body cryotherapy uses a chamber or cabin that chills the air with refrigerated systems or liquid nitrogen. You step inside wearing minimal clothing, plus gloves, socks, and ear protection to guard your extremities. The air drops to somewhere between -150°F and -300°F, but sessions are short, usually two to four minutes. Because air is a poor conductor of heat compared to water, the cold mainly affects your skin and the tissue just below it rather than cooling your muscles deeply.
A cold plunge is straightforward: you sit in a tub, pool, or natural body of water that’s cold enough to provoke a strong physiological response. Water conducts heat away from your body about 25 times faster than air does at the same temperature. That means even though the water temperature is far warmer than a cryotherapy chamber, the actual cooling effect on your tissues is more aggressive. Cold plunges also create hydrostatic pressure, the gentle squeeze of water against your body, which helps push fluid out of swollen tissues and supports blood flow back toward the heart. Air-based cryotherapy doesn’t offer this.
Muscle Soreness and Recovery
If your main goal is reducing post-workout soreness, cold water immersion has a measurable edge. A 2024 systematic review and meta-analysis compared cold water immersion directly against whole-body cryotherapy for delayed onset muscle soreness (DOMS) and found that cold water was significantly more effective at reducing soreness within the first 24 hours after exercise. By 48 hours, the difference between the two methods was no longer statistically significant, suggesting that cold water’s advantage is strongest in the short term.
Interestingly, cryotherapy showed a small advantage in one area: jump performance recovery at 24 hours. Athletes who used cryotherapy regained slightly more explosive power in the first day compared to those who used cold water. But the researchers flagged this result as fragile, with a marginal effect size and inconsistency across the studies they reviewed. By 48 hours, the two methods performed about the same for jump recovery as well.
The likely explanation for cold water’s edge in soreness relief ties back to hydrostatic pressure. That physical compression from the water reduces swelling more effectively than cold air alone, and swelling is a major contributor to that stiff, achy feeling after a hard workout.
Effects on Stress Hormones and Mood
Both methods trigger a powerful release of norepinephrine, a hormone and neurotransmitter involved in alertness, focus, and mood. A study tracking healthy women over 12 weeks found that both winter swimming (a form of cold water immersion) and whole-body cryotherapy produced remarkably similar norepinephrine responses: a two- to three-fold increase after each session, sustained consistently across the entire 12-week period. The body did not adapt away this response over time.
That sustained norepinephrine spike likely explains why people who use either method regularly report feeling more alert, energized, and even euphoric afterward. It also plays a role in pain relief. Notably, the stress hormone cortisol did not stay elevated over time with either method. Initial sessions caused some cortisol increase, but by week four the body had habituated, meaning you get the mood and alertness benefits without a chronic stress response.
Inflammatory markers in the blood also stayed flat across both modalities in that study, which suggests neither method causes systemic inflammation, even with repeated use.
Brown Fat and Metabolism
Cold exposure is the most well-studied trigger for activating brown fat, a type of fat tissue that burns calories to generate heat rather than storing energy. When you get cold, your sympathetic nervous system releases norepinephrine, which signals brown fat cells to ramp up their metabolic activity. This increases energy expenditure and improves how your body handles blood sugar and lipids.
Both cryotherapy and cold plunges activate this pathway. However, the depth of cooling matters. Because water extracts heat so much faster, cold plunges likely produce a stronger and more sustained drop in core body temperature, which is the signal that drives brown fat activation. Research hasn’t yet produced a clean head-to-head comparison of brown fat activity between the two methods, but the physics favor cold water for deeper metabolic stimulation per minute of exposure.
Safety Risks Are Different
The risks of each method reflect the medium you’re dealing with. Cryotherapy’s primary concerns are frostbite and, in nitrogen-cooled chambers, the potential for oxygen displacement if the room isn’t properly ventilated. Protective gear for your hands, feet, and ears is essential because those extremities lose heat quickly and can develop frostbite in seconds at chamber temperatures. Burns from direct contact with ultra-cold surfaces are also possible.
Cold plunges carry a different set of risks. The initial shock of cold water triggers a gasp reflex and a rapid spike in heart rate and blood pressure, which can be dangerous for people with cardiovascular conditions. Staying in too long raises the risk of hypothermia, since the water is so efficient at pulling heat from your body. Drowning is a real concern if you’re alone and become incapacitated. Time awareness matters: most protocols recommend starting with just one to two minutes and gradually building tolerance.
Cost and Accessibility
Cryotherapy requires specialized equipment that most people access through a commercial facility. Sessions typically run $40 to $60 each, though memberships can bring the per-session cost down. You’re in and out quickly, which is convenient, but the expense adds up with regular use.
Cold plunges are far more accessible for home use. A basic setup can cost as little as $300 (a chest freezer conversion or a simple insulated tub), while purpose-built cold plunge tubs with filtration and temperature control range up to around $5,000. Once you have the equipment, the ongoing cost is minimal. You can also get the same effect for free in a cold lake, river, or ocean if you have access to one.
Which One Makes More Sense
For most people focused on post-exercise recovery and soreness reduction, cold water immersion is the stronger choice. It delivers deeper tissue cooling, adds the benefit of hydrostatic pressure, and the research gives it a clear edge for short-term soreness relief. It’s also far cheaper over time if you invest in a home setup.
Cryotherapy makes more sense if you dislike being submerged in water, prefer a shorter and drier experience, or want to avoid the cardiovascular shock that cold water immersion produces. Some athletes use it specifically because it’s less taxing on the body while still delivering the norepinephrine boost and mood benefits, which appear nearly identical between the two methods. For the hormonal and mental health effects of cold exposure, the evidence suggests it genuinely doesn’t matter much which one you pick. Both produce the same sustained spike in norepinephrine, session after session, without building tolerance.