Cryotherapy & Cold Chambers for Recovery: What Works

Few recovery methods are sold as expensively as the cold chamber. Minus 110 degrees, two minutes, a monthly subscription — and the promise that legs and head are rebooted afterwards. Part of that is physiology, part is feeling, part is marketing. This article separates the three cleanly: what cold actually triggers in the body, how whole-body cryotherapy differs from a bucket of ice water, which effects are supported by studies — and in which weeks you should deliberately skip it because it blunts the training stimulus.

What cold does in the body

Cold is not an active ingredient but a stimulus with several consequences. At the skin, blood vessels constrict, muscle blood flow drops noticeably for 20 to 40 minutes, and skin temperature falls by 10 to 20 degrees depending on the method — while core temperature barely changes during short exposures. That gap is the core of the method: strong surface cooling without tipping the body into genuine hypothermia.

Three effects follow that matter to athletes. First, analgesia: cold dampens pain signal transmission and lowers the perception of soreness, an effect that lasts one to two hours. Second, the circulatory response: on leaving the cold the vessels dilate again and blood flow briefly rises, which most people describe as feeling fresh. Third, the hormonal response: cold exposure measurably raises noradrenaline and dopamine, improving alertness and mood for several hours — the reason the session feels so immediately effective.

What cold does not deliver is repair. Muscle protein synthesis, glycogen stores and micro-damage in the fibres need nutrients, protein and time. Cold changes the perception of those processes, not their speed. Anyone who goes into the chamber after training and therefore skips the meal has the order backwards. The fundamentals are in Recovery in endurance sport.

Cold chamber versus ice bath: the difference is in the detail

A whole-body cryochamber runs at minus 110 to minus 160 degrees Celsius for two to three minutes. The air is extremely dry, so there is no water pressure and no evaporative cooling across the whole body. Skin cools faster than in a 10-degree ice bath; core temperature practically does not drop. An ice bath at 10 to 15 degrees for 10 to 15 minutes adds hydrostatic pressure, which acts on swelling and oedema — an advantage dry cold does not have.

In direct comparisons the two methods come out similar on the hard endpoints: soreness, creatine kinase in the blood, jump performance and endurance performance the next day usually do not differ significantly. The practical difference is logistics. The chamber is more hygienic, takes two minutes instead of fifteen and fits into a lunch break; the ice bath costs nothing but requires willpower and a tub. If you want the dosing for the water version, see Ice baths for recovery.

The evidence: plenty of feel, little hard data

The honest summary is this: many small studies, few large ones, and results mostly neutral to mildly positive. For pain and perceived recovery, meta-analyses show small to moderate effects — soreness is rated clearly lower, especially in the first 24 hours. For objective markers such as creatine kinase, muscle strength or jump height, effects are mostly small and non-significant in about a third of trials. For next-day performance there is no robust evidence of an advantage over passive recovery.

The most important critical point concerns design. Most chamber studies lack a credible control group: someone who knows they stood at minus 110 degrees expects recovery — and reports it. Placebo chambers at minus 10 degrees, indistinguishable to laypeople, regularly produce effects similar to the real cold. That does not mean cryotherapy does nothing. It means a relevant share of the reported effect runs through expectation and attention, and should be dosed accordingly: as a tool, not a religion.

A second point concerns transferability. Many studies use unaccustomed loading — a series of jumps, or an eccentric protocol in untrained subjects. In trained endurance athletes after a normal training stimulus, soreness is far lower, and so is the room for improvement. Someone in their fourth year of marathon training has less damage to repair after a long run than a subject in their first week.

The biggest caveat: cold blunts adaptation

This is the point advertising never mentions. Muscle growth and endurance adaptation are inflammatory and repair processes. Suppressing them with strong cooling immediately after the stimulus also suppresses part of the signal that drives adaptation. For strength training this is well established: regular cold application after strength work reduced gains in muscle mass and strength by up to roughly 30 percent versus passive recovery in several studies. For endurance work the data is weaker, but the direction is the same — particularly for applications within the first hour after training.

The practical consequence is a simple timing rule. In build phases, where the stimulus is the goal, cold stays the exception: at most after a particularly hard session, never as a daily ritual. In the race phase and race week the logic flips — there you no longer want adaptation but freshness, and cold is a legitimate means of getting legs and head into a better state for the next start. If you train strength and endurance concurrently, place cold sessions on days without strength work, or at least four to six hours after it. More on the combination is in Strength training for runners.

When cryotherapy makes sense — four constellations

• A race block with short gaps. Two races within eight days, a stage race or a tournament: here the ability to be ready again quickly matters more than adaptation. Two or three sessions in that phase are defensible.
• Race week and day minus one. Short, dry, easy to fit into the day. No substitute for sleep, but a useful building block when legs feel heavy after travel.
• Acute pain spikes after injury. Cold is a legitimate painkiller in the first 48 hours after a contusion or strain — as a complement, not a replacement for diagnosis. The pain traffic light helps with classification.
• Heat periods with high load. After a session at 30 degrees and high humidity, cooling the surface tissue genuinely relieves the system, because thermoregulation keeps running long afterwards.

The reverse also holds: in a calm build week with six sessions and nothing hurting, there is no reason for a chamber. The bottleneck there is rarely recovery — it is patience.

Dosing and procedure in practice

For a standard session in a commercial chamber the corridor is narrow: two to three minutes at minus 110 degrees, a maximum of one session per day and three to four per week in race phases. Skin and clothing must be dry before entry — damp skin or sweat in the armpits makes the cold painful and increases the risk of local cold injury. Protection for hands, ears, nose and feet is mandatory: gloves, headband, face mask and dry socks or felt slippers. Eyes stay closed or are covered with goggles.

Movement inside the chamber is slow and controlled: keep the arms slightly bent, breathe calmly, do not jog on the spot. If you shiver, you have been in too long. After the two minutes, no hot bath follows but ten to fifteen minutes of moderate movement so circulation returns without a cold shock — an easy walk, a few mobility drills. And then the actual recovery: protein and carbohydrates. Cold is the starter, not the meal.

For home setups the chamber is irrelevant anyway — there is no serious option below several thousand euros. If you want to work at home, stick to a cold shower (30 to 90 seconds, cold to unpleasant), an ice bath in the tub or cooling cuffs on the knee. These variants are cheap and comparable to the expensive version in their effect on pain and perception.

Safety: the exclusion list

Cold chambers are not a risk-free wellness offering, and operators are liable only if they meet their duty to inform. The chamber should not be used with untreated high blood pressure, with heart disease including arrhythmias, after a heart attack without medical clearance, with Raynaud's syndrome, cold urticaria or other cold hypersensitivity, with open wounds or with claustrophobia. Pregnancy and being under the influence of alcohol or drugs are also off limits.

During the session a simple stop rule applies: dizziness, nausea, shortness of breath, a burning sensation in the extremities or a feeling of panic end the session immediately — the door can be opened at any time, that is part of the safety setup. After stepping out, stay in the anteroom for two to three minutes to stabilise circulation and drink something. For a first visit, do not go alone, and do not try it in the week before an important race without having tested the procedure once. Pre-race health check describes which baseline findings are worth having beforehand.

What cold does not replace

The most effective recovery tool remains sleep, by a clear margin. Eight hours of sleep improve recovery more measurably than any cold application, and no device, however expensive, compensates for a five-hour night. Next comes energy and protein intake, then the distribution of load across the week. Only after that come the adjuncts — cold, compression, massage, foam roller.

The order is not a matter of taste but of physiology: without building material there is no repair, and without sufficient spacing between stimuli no cooling helps. Anyone who tries to limit the damage after a marathon with four hours of sleep, no meal and two chamber sessions has inverted the priorities. Two articles that describe this framework cleanly are Sleep and endurance performance and The deload week.

Where it fits in training control

In Peakora, recovery is not a feeling but a quantity: the engine converts every session into TSS, tracks CTL, ATL and TSB and shows whether the form curve matches the goal. That makes the value of cold verifiable. Anyone who goes into the chamber daily during a build week with rising CTL will not see a better curve — if anything a flatter one, because the stimulus is blunted. Anyone who places two sessions in race week and moves TSB from minus 10 to zero is doing something sensible.

The concrete planning rule that follows: cold belongs in the final seven to ten days before a goal race and in phases with several starts in quick succession. In the build phase it stays a one-off after an outstanding load, such as a 35-kilometre run or a mountain marathon. How the load metrics interact is in TSS, CTL and TSB; the basics of post-race recovery are in Recovery after the marathon.

For triathletes there is one extra rule: after swimming, cold application is the wrong first step because the skin is already cooled. There, warmth and food come first, the chamber at the earliest in the evening. More in the triathlon training guide (German) and in the Peakora glossary for terms such as cold therapy, supercompensation and recovery deficit.

Common mistakes

• Going daily. The most frequent mistake. A tool for tight phases becomes a ritual that blunts the training stimulus in build weeks and costs money.
• Cold instead of a meal. Standing at minus 110 degrees for two minutes first and postponing protein intake gets the order backwards.
• Entering wet. Sweat on the skin makes the cold not only unpleasant but dangerous — local cold injury to armpits, groin and toes is avoidable.
• Using expectation as a measuring tool. Judging the effect by feel alone measures your own expectation. Resting heart rate, leg heaviness the next day and the form curve over four weeks are more informative.
• Self-treating an injury. Cold relieves pain but diagnoses nothing. Pain that is not clearly better after 72 hours needs assessment.

Bottom line: a tool, not a subscription

Whole-body cryotherapy is neither a miracle cure nor a waste of money. It eases soreness, improves the feeling of recovery for a few hours and is practical in tight race phases because it is dry, short and plannable. It does not measurably improve next-day performance, it costs money, and it can blunt adaptation to training stimuli if used too often at the wrong time.

Sensible use fits in one sentence: deliberately in race week, sparingly in the build, never as a substitute for sleep and food. Anyone who follows that gets the same effect for a fraction of the price — with an ice bath at home, in the tub, with ice cubes from the supermarket.

Frequently asked questions