Entering icy water for a few minutes is a simple way to get a strong energy boost. Regular cold-water bathing may also directly improve overall well-being and strengthen the immune system. These benefits attract more and more winter-swimming enthusiasts each year. When can it be considered safe? Does this activity have only advantages? What are its limitations? We answer these and other questions in this article.
- Winter swimming involves briefly immersing the body in cold water, usually below 15°C.
- Cold water immediately triggers nervous, respiratory and circulatory reactions.
- Regular winter swimming may affect well-being, sleep, cold tolerance and immune-system function.
- Entering too quickly or staying too long increases the risk of chilling and reduced physical ability.
- A typical session lasts about 3–5 minutes, but the time should always match your experience and bodily response.
- Key: common sense, gradual cold acclimatization, and never forcing a longer stay in the water.
What exactly is winter swimming?
Winter swimming is the deliberate, brief immersion of the body in cold water, usually below 15°C. It usually takes place in autumn and winter. You can swim in natural waters such as the sea or a lake, or indoors in a cool pool or even a bathtub. Exposure usually lasts 3 to 5 minutes, with immersion up to the chest or neck. Swimming is not necessary.
What happens to the body after entering cold water?
Cold water begins affecting the body almost immediately after immersion. The nervous, respiratory and cardiovascular systems respond first, followed by mechanisms that limit heat loss. In regular winter swimmers, these reactions may become milder over time.
| Stage | What happens in the body? |
|---|---|
| First seconds | Breathing and heart rate speed up, while blood vessels in the skin and limbs constrict. This limits heat loss to the surroundings. |
| First minute | More blood is directed to the body’s core, and blood pressure rises. The initially intense response gradually begins to stabilize. |
| Following minutes | Skin and limb temperature gradually falls. The body increases heat production through muscle activity and shivering. During longer immersion, the performance of chilled hands and feet also declines. |
| After leaving the water | The body does not immediately return to its pre-immersion temperature. Core temperature may continue falling for several dozen minutes (the “afterdrop”), so you may feel colder after winter swimming ends. |
Is winter swimming healthy?
For a healthy person, winter swimming can be a valuable activity if practiced sensibly and with attention to the body’s response. Regular cold-water exposure triggers adaptation to low temperatures and may affect several body systems. However, colder water or a longer stay does not necessarily mean a better effect. The body needs time to adapt, and cold tolerance varies from person to person.
After a cold bath, it is good to have somewhere to return to, rest and spend the rest of the day comfortably. At Bursztynowe Resort & SPA in Stegna, guests can enjoy apartments and a year-round Wellness area with a pool, jacuzzi and saunas.
Benefits felt immediately after entering the water
The effects of a cold bath can be felt during the icy bath and shortly after leaving the water. Cold water primarily stimulates the sympathetic nervous system and increases catecholamine release (hormones and neurotransmitters including adrenaline and noradrenaline), so many people feel markedly energized, more alert and full of energy during and after winter swimming. Some also experience improved well-being and mood.
Benefits of regular winter swimming
Regular winter swimming may also produce longer-term effects related to body function:
- Lower perceived stress – linked to changes in how the nervous system responds to stressful stimuli.
- Effects on immunity – linked to changes in immune cells and processes.
- Better sleep quality – may result from nervous-system regulation and body calming.
- Better daily well-being – linked partly to changes in nervous and hormonal function.
- More efficient glucose use – greater insulin sensitivity helps cells absorb glucose from the blood.
- Better tolerance of low temperatures – body gradually responds more mildly to cold.
- More efficient heat production – the body may activate mechanisms that help maintain temperature in cold conditions.
- Inflammation effects – may help curb excessive inflammatory responses and support tissue regeneration.
Cold baths may also be used after intense exercise. Research on cold-water immersion suggests it may reduce muscle soreness in the hours and days after training. This effect may occur after a single post-exercise session.
When can winter swimming be harmful?
Winter swimming can be harmful mainly when the body is exposed to cold too suddenly or for too long. In the first case, the response may be so intense that breathing problems, dizziness or marked weakness occur. Staying in the water too long leads to progressive chilling, poorer coordination and loss of mobility. If exposure continues despite these symptoms, the risk of severe chilling and hypothermia increases.
Who should not go winter swimming?
It is best to avoid winter swimming during an ongoing infection, when the body is clearly not in good condition. This activity may worsen your current state. Before starting cold baths, consult a doctor if you have:
- heart or circulatory diseases,
- uncontrolled hypertension,
- neurological diseases,
- chronic diseases that may affect the body’s response to cold,
- pregnancy.
7 rules for safe winter swimming
Safe winter swimming requires no complicated preparation, but it is worth following a few basic rules. The most important are:
- Never swim alone – if you faint, have trouble breathing or cannot get out of the water, another person can respond quickly.
- Enter water gradually—this limits the body's initial cold response and eases breathing control.
- Don't treat time in the water as a record to beat – too long an exposure increases the risk of hypothermia and reduced mobility.
- Check conditions before entering – waves, strong wind, currents or difficult access may make leaving the water much harder than entering.
- Don't cold-water swim after drinking– alcohol impairs judgment and may mask cold.
- Stay close to shore and an easy exit – as you cool down, strength and movement precision decline, so a distance that seems short at first may later become a problem.
- Prepare dry clothes and a towel – your body may continue cooling after leaving the water, so drying and changing quickly help limit further heat loss.
How long can you stay in cold water?
The safe time to spend in cold water varies greatly. A typical cold-water swim lasts around 3–5 minutes, but beginners should limit their first attempts to as little as several dozen seconds. Regular swimmers may stay in the water longer if they tolerate the low temperature well. The most important thing is to observe your body and not extend your stay by force – time in the water should not be the goal.
Is cold-water swimming worth trying?
If there are no health contraindications and the activity is undertaken sensibly, cold-water swimming can be an excellent idea. It is a simple winter activity requiring no specialist equipment, major expense or hours of training. All you need is a suitable place, a few minutes and a little commitment to add something new to your routine. For many, it eventually becomes a seasonal ritual, a reason to leave home and a way to break routine. So treat your first swim not as a test of endurance, but simply as a new experience, and see whether this activity is right for you.
Cold-water swimming is also a good excuse to discover the Baltic out of season. Combine a winter sea swim with a beach walk, followed by relaxation in comfortable surroundings. For such a trip, we invite you to our seaside hotel in Stegna, where, after active time by the sea, you can enjoy, among other things, a pool, jacuzzi and sauna area.
FAQ
Must you dunk your head during cold-water
No, your head usually stays above the water. Submerging it is not necessary, especially when starting this activity.
Can non-swimmers cold-water swim?
No, if it involves briefly immersing yourself in shallow water. However, stay where you can stand comfortably and easily reach the shore.
Can you cold-water swim alone?
You shouldn't. Having someone with you allows a faster response if you faint, have trouble breathing or struggle to leave the water.
Can you cold-water swim with a cold?
No. An active infection, including a cold, temporarily contraindicates cold-water swimming.
Warm-up needed after cold-water swimming?
Yes. After leaving the water, dry off quickly, remove wet clothes and put on dry, warm clothing, as your body may continue losing heat.
What water temperature means cold-water swimming?
There is no single fixed threshold. Water below 15°C is often considered cold. Typical winter cold-water swimming usually takes place in much colder water, sometimes close to 0°C.
Need medical tests before starting cold-water swimming?
There is no single set of tests required for every healthy person. If you have chronic conditions, especially heart or circulatory problems, or health concerns, consult a doctor beforehand.
