In a nutshell 💡
- The body continues to heat up after you stop exercising. It takes several tens of minutes for your core temperature to drop, and it’s this window of time that matters.
- Two goals that shouldn’t be confused: lowering body temperature and reducing muscle inflammation. These require different methods.
- When it comes to temperature, cold is very effective, and there’s a consensus on that. When it comes to muscle soreness and performance, the results are more nuanced than is commonly believed.
- The first 30 minutes are spent right where you are, without any equipment: shade, air, water, and clothing. The cold bath comes later, once you’ve made it to a locker room.
- Cold isn’t recommended in every situation: there are certain circumstances where you should avoid it.
You stopped running ten minutes ago. Your breathing has returned to normal, your heart rate has slowed, and yet your body temperature is still rising.
This discrepancy may come as a surprise, but it makes perfect sense. Your muscles generated a significant amount of heat during exercise, and that heat takes time to reach the body’s periphery so it can be dissipated. Stopping the activity doesn’t halt this process—it simply makes it more apparent.
It’s precisely during this window that cooling takes place. Here’s what each method actually does, when to use it, and when to skip it.
See also: How does our body regulate its temperature in the summer?
What happens in the body when exercise stops?
During exercise, heat production can far exceed what the body can dissipate. The excess is stored, and core body temperature rises. When exercise stops, three things happen simultaneously.
Heat production drops sharply, since the muscles stop working. But heat dissipation also slows down: breathing rate decreases, peripheral circulation gradually reduces, and—most importantly—the airflow disappears if you were moving. A runner who stops suddenly loses all the convection they were benefiting from.
As a result, the heat accumulated in the deep muscles continues to enter the bloodstream while the means to dissipate it diminish. It then takes several tens of minutes for the temperature to return to normal, with a peak that may occur after the end of the session.
This phase is doubly important when a second effort follows later in the day, which is common in tournaments or multi-round competitions.
Two different objectives that are constantly confused
This is the distinction that’s missing from most advice, and it changes the entire line of reasoning.
Objective 1: Lower body temperature
The goal is to dissipate accumulated heat as quickly as possible after stopping. This is a matter of safety and comfort before it is a matter of performance. It’s particularly important after exercise in a hot environment.
In this regard, there is a consensus on the benefits of cold: leading studies, particularly those by INSEP on cooling techniques, confirm that immersion and post-exercise cooling effectively lower body temperature.
Objective 2: Addressing muscle recovery and inflammation
The goal here is to minimize muscle pain, soreness, and the sensation of heavy legs. It’s a matter of recovery, over the course of the following hours and days.
In this area, however, the discussion warrants greater caution. The same studies report “mixed” results regarding performance, and some even suggest that excessive and systematic exposure to intense cold could hinder the adaptations sought through training, particularly in strength training.
In other words: cold exposure is highly effective for what is rarely discussed, and controversial for what is most often attributed to it.
How this affects a training plan
The practical implication is rarely mentioned: the role of cold exposure depends on what you’re aiming for that day.
- After a workout in extreme heat: cooling down is a priority—it’s a matter of health before it’s a matter of recovery
- After a muscle-building session, whether in bodybuilding or strength training: systematic exposure to intense cold isn’t necessarily desirable, since inflammation is part of the adaptation process
- During a period of back-to-back competitions, with multiple efforts in the same day: cooling down once again becomes the go-to method, as the goal is to be ready to compete quickly rather than to make progress
An athlete in training and a player in a tournament therefore do not have the same benefit from immersion, even though both are coming off an intense workout.
The first 30 minutes: what to do right there
This is the most useful and most overlooked phase, because it occurs at a time when you generally have nothing on hand. Four strategies, all immediate.
- Get out of the sun first and foremost. Staying exposed negates the benefits of everything else.
- Get moving air: a fan, a draft, or simply an open space. This is what restarts the evaporation that stopping the run had interrupted.
- Wet the areas with the most blood vessels: the back of the neck, wrists, forearms, and face. Use cool water rather than ice-cold water, and above all, don’t wipe it off afterward.
- Drink regularly, in small amounts, to allow sweating to continue doing its job.
A cooling fabric fits perfectly into this scenario. Its benefit isn’t that it’s more effective than a cold bath—it isn’t. It’s that it’s immediately available, right there, without any setup, at the exact moment when the temperature is at its highest and you don’t yet have access to anything else.
A TechCool™ men’s cooling sports T-shirt works by heat conduction upon contact, without dampening the skin, which prevents adding moisture just when you’re trying to dry off. The PhaseCool™ EVO cooling arm sleeves target the forearms, one of the most effective areas to cool.
Cold baths and immersion
This is the most well-documented method, and the one that lowers core body temperature the fastest, thanks to water’s thermal conductivity, which is much higher than that of air.
Commonly recommended guidelines call for water temperatures between 10 and 15 °C for a duration of 10 to 15 minutes. Below this range, discomfort increases without a proportional benefit.
Its limitations are both practical and physiological. It requires a dedicated setup, meaning there is a delay before you can use it, even though the effective window has already begun. And its value in terms of training adaptations remains, as mentioned, a matter of debate depending on the specific goals being pursued.
Cold bath or cold shower?
A shower is much more accessible and still useful, but less effective: only part of the body is in contact with the water at any given moment, and the temperature is rarely as low or as stable as during immersion.
Localized cold therapy: ice, compresses, ice packs
Cold applied to a specific area addresses a completely different need: a painful joint, an injury, or an area of congestion. It is not a tool for general cooling.
Two rules consistently appear in the recommendations:
- Never apply ice directly to the skin: always place a cloth between the ice and the skin to prevent cold burns
- Short applications, lasting about 10 to 20 minutes, spaced out, rather than prolonged exposure
Some practitioners recommend waiting 15 to 30 minutes after exercise before applying local cold, to allow the body time to begin returning to a resting state.
Whole-Body Cryotherapy
This involves very brief exposure—two to three minutes—to extremely cold air in a specialized chamber. It is used to aid recovery in elite athletes.
Its actual benefits are a matter of debate, and its use requires professional equipment and supervision. It’s a method worth knowing about, but rarely a day-to-day solution, and it in no way replaces the steps taken during the first thirty minutes.
When Cold Therapy Is Not Recommended
Cold therapy is not without risks, and there are several situations in which you should avoid it or seek medical advice first.
- Known circulatory disorders, particularly Raynaud’s syndrome, in which cold specifically triggers an attack
- Open wounds, skin lesions, or impaired sensation in the affected area
- Certain heart conditions: immersion in cold water places significant strain on the cardiovascular system
- After physical exertion in conditions of relative hypothermia—in cold or damp weather—when the opposite approach is needed
If in doubt, consult a doctor, not a forum. This is especially true for cryotherapy and full-body immersion, which place far greater demands on the body than a simple cool shower.
A sports medicine physician is the right person to consult for a definitive answer, particularly if you’re doing multiple workouts per week or if your health requires special monitoring. No general advice—including this one—can replace an individualized assessment.
The table of methods
| Method | Main objective | When | Available on site |
|---|---|---|---|
| Shade and moving air | Body temperature | Immediately | Yes |
| Cool water on vascularized areas | Body temperature | Immediately | Yes |
| Cooling textiles | Body temperature | During and after exercise | Yes |
| Cold shower | Temperature and comfort | After returning to a calm state | No |
| Cold-water immersion | Temperature, muscles (debated) | 10 to 15 min after returning to a calm state | No |
| Local cold, ice | Painful or congested area | 15 to 30 min after exercise | Depending on equipment |
| Whole-body cryotherapy | Recovery (debated) | Supervised session | No |
To learn more: Exercise and Heat: How to Exercise in Hot Weather?
Recovery isn't just about staying cool
Cold is just one of several factors—and probably not the most important one. Gradually slowing down—running at a very low pace for a few minutes rather than stopping abruptly—helps your circulation flush out heat and metabolic waste.
Hydration remains the foundation, with regular fluid intake to replenish what was lost during the session. Nutrition and sleep do the rest, over a timeframe that neither ice nor a bath can shorten.
Most athletes think recovery starts in the shower. It begins the moment you stop, and the first thirty minutes almost always take place without any equipment.
— Édouard Castaignet, co-founder of G-Heat
Equipping the phase when you have nothing on hand
This is the only promise we make in this area, and it’s intentionally narrow. A cooling garment is no substitute for immersion in water or medical advice. It covers the window of time during which none of the other methods are available.
On your head, a PolyCool™ cooling, UV-protective hat extends the cooling effect for several hours thanks to the water retained in its fibers—useful when the end of your workout runs late in direct sunlight. On your forehead, a TechCool™ cooling sports headband cools your temples without getting damp.
The entire collection can be found in cooling apparel, cooling T-shirts, and cooling accessories, including cooling arm sleeves and cooling caps and hats for more details on the product lines.
Don’t miss: Sports and Heat Waves: How to Keep Training Safely?
Why Choose G-Heat for the Recovery Phase
G-Heat has been designing thermal regulation gear since 2017. When it comes to recovery, our position is clear and straightforward: our products affect body temperature, not muscle inflammation. We make no claims regarding their effects on muscle soreness or the following day’s performance.
Each product describes the technology it incorporates and how it works, so you can understand the mechanism behind its claims. This also helps you make an informed choice: a fabric designed to be activated in water and one that works when dry are suited for different situations.
Conclusion
Cooling down after exercise isn’t about the intensity of the cold, but about the sequence. The first thirty minutes take place on the spot, using shade, air, water, and possibly a cooling garment. Immersion and localized cooling come next, each with different objectives and precautions to follow.
The key to remember: always distinguish what you’re trying to achieve. Lowering your body temperature is one thing. Recovering your muscles is another, and the methods only partially overlap.
Whatever the weather. G-Heat, in all weather conditions.
Frequently Asked Questions
Why do I feel cold after physical exertion?
Because the accumulated heat is released all at once while heat production has stopped. Sweat continues to evaporate from damp skin and clothing, which cools you down quickly—sometimes too much. In this specific case, you should change your clothes and cover up, not cool down further.
How long does it take for your body temperature to return to normal?
Several tens of minutes after intense exercise, with a peak that may occur after you stop. The time required depends on the intensity, duration, ambient temperature, and humidity.
Cold bath or cold shower: which should you choose?
Immersion is more effective because the body is fully in contact with water at a stable temperature. A shower is much more accessible and still helpful, but its effect is more limited and less consistent.
Should you apply cold immediately after exercise?
To lower body temperature, yes—as soon as possible. For localized cold application to a painful area, some practitioners recommend waiting 15 to 30 minutes, until the body begins to cool down.
Does cold therapy after exercise really make muscle soreness go away?
Its effect on muscle pain is real but more modest than is often claimed, and studies on performance yield mixed results. Cold therapy, however, is very effective at lowering body temperature—a benefit that’s discussed much less frequently.
Can you exercise when you have a cold?
This isn’t quite the same topic, but the question comes up often. In the case of a simple cold without a fever, light exercise is generally possible. If you have a fever, muscle soreness, or feel generally unwell, you should refrain from exercising and wait for the symptoms to subside.
Does cooling clothing replace a cold bath?
No, and we don’t claim that it does. Immersion lowers body temperature more effectively. The garment has another advantage: it’s immediately available, right there on the spot, with no setup required, precisely when your body temperature is at its highest.
Sources and References
[1] “Body Cooling Techniques”, INSEP
[2] “Physical Activity and Extreme Heat: Mechanisms of Thermoregulation”, Weekly Epidemiological Bulletin, Santé publique France
[3] “Sports: Preventing Temperature Regulation Problems”, Vidal
[4] “Exercise-Induced Hyperthermia or Heat Stroke During Exercise”, IRBMS
[5] “Working in the Heat: Key Takeaways”, INRS
[6] “Ultraviolet Radiation”, Santé publique France
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