Spending just a few minutes in water that’s between 10°C to 15°C can really help reduce muscle soreness, cut down on inflammation, enhance your focus for hours after, and even trigger several positive changes in your body, impacting your nervous system, immune function, metabolism, and hormone levels. However, to enjoy these benefits fully, it’s important to pay attention to things like timing, temperature, training goals, and recovery times. If you want to reap these rewards without having to fuss over the details, TH7 studios offer guided ice bath sessions. You can easily book a session and enjoy all the benefits tailored just for you.

What ice baths do

When you immerse yourself in cold water, your skin and your core body temperatures drop by quite a bit. This causes your blood vessels to tighten and it also increases the levels of noradrenaline and dopamine in your body. During the rewarming phase, your nervous system goes from being in a ‘fight or flight’ mode to a more relaxed ‘rest and digest’ state. This change leads to several positive outcomes. You might experience less muscle soreness following intense workouts, reduced swelling in the tissues, heightened mental clarity, and an uplifted mood that lasts for hours. With consistent practice, cold water immersion can also improve your ability to handle stress much better.

While ice baths offer a plethora of advantages, they aren’t a cure-all solution. They are most effective as part of a comprehensive recovery and training regimen. These benefits can be further amplified when combined with heat therapy.

What happens when you plunge into an ice bath?

The cold shock response

It’s not just a jolt of cold you’re experiencing; it’s a full-body experience. The second your skin touches that icy water, cold receptors send rapid signals to your nervous system, which catches your body off guard. This triggers an involuntary gasp followed by quickened breathing. Your heart begins to race, and your blood pressure spikes. Noradrenaline surges through your bloodstream, too, reaching levels two to three times higher than usual.

This immediate reaction (which is known as the “cold shock response”) is the very reason why ice baths always feel intense, even for seasoned ice enthusiasts. To make the most of this, controlled breathing is essential. Taking long, slow exhales can help calm your system within just a minute or two, which is why coaches at TH7 emphasise breath control for first-timers before they even enter the water.

Vasoconstriction and rewarming

After the initial cold shock, your body starts to adapt. Your blood vessels constrict to keep warm blood near your vital organs, reducing blood flow to your limbs. This process also helps move metabolic waste (like lactic acid and other byproducts of strenuous exercise) back into central circulation for clearance.

But when you step out of the bath, the opposite occurs.  Blood vessels widen, allowing fresh, oxygen-rich blood to flood back into your muscles. This is when your parasympathetic nervous system kicks in, aiding recovery and enhancing your mood. This rewarming phase is where most of the physical and mental benefits of ice bathing take shape.

The physical benefits backed by research

Eases sore muscles after intense workouts

Many athletes find relief from sore muscles after intense exercise by using cold water immersion. Research published in Sports Medicine highlights that this method significantly reduces delayed onset muscle soreness within 24 to 72 hours post-exercise. Immersing in water between 10°C to 15°C for about 10 to 15 minutes proves more effective than just resting. This is especially true after workouts involving eccentric movements, contact sports, or high-volume endurance activities. If you’ve ever felt the struggle of descending stairs two days after a tough leg workout or a long run, this benefit is likely what you need the most.

Reduces inflammation and swelling

Cold exposure works wonders for swelling, much like how an ice pack helps a sprained ankle. By causing vasoconstriction, it limits fluid buildup in injured tissues and slows down local inflammation. Whole-body immersion in cold water amplifies these effects by addressing all engaged muscle groups simultaneously. This makes ice baths a staple in recovery routines for contact sports. For example, a rugby player taking on numerous collisions throughout a match would benefit from reduced inflammation in multiple areas after just one single session.

Lowers core body temperature after heat exposure

Training hard under the summer sun can leave your core body temperature elevated for hours, affecting your heart rate, sleep, and recovery. Cold immersion efficiently cools down core temperature, which is why endurance athletes often take ice baths between sessions during hot weather competitions. This cooling effect helps them recover faster and perform better in subsequent workouts.

Supports immune function

Regular exposure to cold water seems to boost immune function by increasing levels of certain white blood cells, such as monocytes and lymphocytes. A 2016 Dutch study found that individuals who ended their showers with 30 to 90 seconds of cold water took 29% fewer sick days, although the impact on actual infection rates remained uncertain. While the evidence is not definitive, it suggests that cold therapy may gently stimulate the immune system over time.

In another article, we explored the potential benefits of ice baths on the immune system. While the evidence isn’t conclusive, it does appear that cold therapy might gently boost immune function with regular use.

Stimulates brown adipose tissue and metabolic rate

Brown fat plays a big role in burning energy to produce heat. When adults regularly expose themselves to cold temperatures, their brown adipose tissue becomes more active and increases in volume. This change leads to a slight boost in the resting metabolic rate. While a single ice bath may not have a huge metabolic impact by itself, those who consistently practice cold plunging over several months can see more substantial benefits. This habit particularly improves metabolic health markers (such as insulin sensitivity) offering enhancement to overall metabolic health.

The mental and cognitive benefits

Sharper focus and alertness

Cold immersion triggers a natural boost in noradrenaline and this is similar to what stimulants aim to achieve, but without the harsh side effects. This surge sharpens your focus and quickens your reaction time, leaving you mentally alert for a few hours afterwards. A 2023 study in Biology highlighted that participants felt more energetic and attentive after a five-minute cold bath, a result linked to improved connections between brain networks responsible for attention and self-control. Many TH7 members prefer morning sessions to capitalise on these effects.

Elevating mood through dopamine and noradrenaline release

Exposure to cold water triggers a gradual and sustained release of dopamine, boosting your mood in a steady, lasting manner. Unlike the quick highs from sugar or social media, this method gives you a stable boost. For anyone experiencing mild depression or seasonal mood changes, this neurochemical pattern provides a significant mental uplift, which we explore further in our article on ice baths and depression.

Better sleep and reduced fatigue

Cooling your core temperature gives a signal to your body to start falling asleep. Taking an ice bath three to four hours before your bedtime can aid those training in the evening or having trouble winding down. Timing is crucial, though. Do it too close to bed, and noradrenaline keeps you awake; too early, and the cooling effect dissipates. For more on how cold exposure affects sleep cycles, check out our guide on ice baths and sleep.

Building resilience to stress

While harder to quantify, the stress resilience gained from cold exposure is consistently reported. By voluntarily facing controlled stress and practising calm breathing, you train your nervous system to remain less reactive in real-world situations. This process (which is known as “hormetic stress”), strengthens your body’s response to larger stressors. Over weeks and months, this practice becomes a valuable tool for stress management, explaining its longstanding presence in cultures worldwide, from Finnish saunas and Russian banyas to modern practices like Wim Hof’s techniques and TH7 Body Labs.

When ice baths might not be your best bet

The impact on muscle growth post-workout

While the benefits of ice baths are often highlighted, the downside is sometimes overlooked. If you’re aiming to build muscle after a resistance training session focused on hypertrophy, immersing yourself in cold water within an hour could hinder your progress. A study published in Sports Medicine reveals that regular cold water immersion can negatively affect gains from resistance training. This includes one-rep max performance, maximum isometric strength, strength endurance, and muscle growth, although it doesn’t harm endurance training outcomes.

This is the inconvenient finding that most articles bury. Cold water immersion within an hour of a hypertrophy-focused resistance training session reduces the muscle protein synthesis response and dampens the inflammatory signalling your body uses to build new muscle. A Sports Medicine meta-analysis of regular cold water immersion found that chronic post-workout cold immersion has a deleterious effect on resistance training adaptations across one-rep max, maximum isometric strength, strength endurance and hypertrophy, while showing no negative effect on endurance training adaptations.

Resistance training causes tiny tears in muscle fibres. Your body reacts to these by triggering inflammation and activating satellite cells. This process leads to protein synthesis, which repairs and strengthens your muscles. However, when you take an ice bath too soon, it suppresses the necessary inflammation, thereby slowing down muscle adaptation.

Working out your ice bath timing

If your main goal is muscle growth or increasing strength, it’s best to avoid ice baths right after lifting. Either skip them altogether on heavy strength days or wait at least six hours before taking one. For the best results, consider doing the ice bath the next morning when the immediate adaptation phase has passed. On the other hand, if you’ve completed a high-volume endurance workout, jumping into an ice bath immediately might be beneficial. In this context, the aim is to alleviate fatigue and reduce inflammation, rather than focusing on muscle protein synthesis. 

On days when you’re not training or when you’re recovering from a competition, feel free to use ice baths at any time. If your schedule includes two training sessions in one day, using cold immersion between these sessions can improve your performance in the second session, although it might slightly compromise long-term muscle growth.

The duration question is covered separately in our piece on how long you should ice bath for optimal recovery. But, remember, while ice baths can enhance both athletic performance and recovery, aligning them with your specific training goals is crucial.

Why combining heat and cold provides amazing benefits

What can contrast therapy achieve that ice alone cannot?

Hot and cold water each have their own effects on the body. Heat causes blood vessels to expand, which increases blood flow to the skin and muscles. Cold, on the other hand, narrows the vessels, directing circulation inward. When you alternate between the two, you create a pumping action in your vascular system that neither one can achieve on its own. This process helps blood travel more efficiently through tired muscles and clears away metabolic waste more effectively. Your nervous system also receives a fuller range of signals than it would from just one temperature.

This method is known as “contrast therapy”, and it is widely used from professional sports recovery centres to traditional Scandinavian spa rituals. The combined impact on circulation, lymphatic drainage, nerve relaxation, and tissue oxygenation is a lot more powerful than using ice baths alone. For a more detailed explanation, check out our article on what contrast therapy is and its benefits. The TH7 Nordic Protocol is founded on these principles.

How to try a simple hot and cold routine

Start with spending 10 to 15 minutes in a sauna heated to 80°C to 90°C, which is enough to work up a good sweat. Then, move immediately to an ice bath set between 10°C and 12°C for 1 to 3 minutes. After drying off briefly, return to the sauna for another 10 minutes, and conclude with a final cold plunge lasting 1 to 2 minutes.

The entire session takes about 40 minutes. With each round, the contrast between hot and cold should feel more pronounced, as your body becomes increasingly sensitive to the temperature changes. If you’re unsure whether to start with a sauna or an ice bath, we offer guidance on which sequence might be best in whether sauna or ice bath should come first.

How to safely enjoy an ice bath

Temperature and duration

To reap the benefits of an ice bath without unnecessary risks, aim for a water temperature between 10°C and 15°C and limit your time to 2 to 5 minutes. Going below 10°C offers minimal additional benefits and increases the chance of cold shock, while staying in longer than 5 minutes could lead to hypothermia. If you’re just starting with cold therapy, it’s a good idea to begin with warmer temperatures and shorter sessions. Most people find they can adapt after two or three attempts.

Who should avoid ice baths?

Ice baths really challenge your cardiovascular system, so they might not be suitable for everyone. People with uncontrolled high blood pressure, heart conditions, arrhythmias, Raynaud’s, severe diabetes, or those who are pregnant should consult their doctor before trying an ice bath. The risks increase with colder temperatures and longer durations, too. This doesn’t mean it’s off-limits for everyone in these groups; many can safely participate with medical advice and careful monitoring. The key is to check with a healthcare professional first, rather than facing an unforeseen issue during your bath.

Signs you need to get out

You need to exit the bath immediately if you experience chest pain, dizziness, numbness spreading beyond your extremities, sudden difficulty in breathing, or confusion. Although shivering is normal during and after an ice bath, uncontrollable shivering that persists despite using a warm towel and moving around is a sign to stop. A simple guideline: if you find it hard to hold a basic conversation, it’s time to get out.

Trying an ice bath at a TH7 recovery centre

TH7 Body Labs offers specialised cold plunge tubs in Brisbane, Cleveland, and on the Sunshine Coast. The water temperature remains steady between 10°C to 12°C. To enhance the experience, saunas and steam rooms are available, providing an ideal setting for contrast therapy. Our team assists first-time visitors by guiding them through breath control and timing before they step into the cold.

You have the option to book a single visit, experience the Nordic Protocol, incorporate cold immersion into a broader recovery routine, or enjoy a combination of all three. The same ice bath equipment is trusted by professional teams such as the Broncos, Wallabies, Brisbane Lions, and Queensland Reds, who choose TH7 for their training and recovery needs.

FAQs

How often should I do an ice bath?

It takes only two to four plunges a week to reap all the benefits without burdening yourself unnecessarily. There are daily plungers, but the law of diminishing returns soon set in. If you are a dedicated fitness fan, then structure your plunge according to your fitness regimen.

Are cold showers a good substitute for an ice bath?

Cold showers provide you with a portion of cold shock response and a small boost of noradrenaline, but the temperature of water is not cold enough and you do not fully immerse yourself, making the result not comparable with the one provided by an ice bath.

Can I do an ice bath if I am trying to build muscle?

Yes, but not within six hours of a resistance training session. Plunge on rest days or before training instead. Cardio-focused days also work. Timing matters more than frequency for protecting muscle growth.

Is it normal to feel sleepy after an ice bath?

Absolutely, but definitely not within six hours after resistance training exercises. Try taking a cold shower on your non-training days or before starting any form of exercise. Cardio days can be a good choice as well.

Do ice baths help with anxiety?

The use of cold water immersion can lower baseline anxiety levels by exposing yourself to controlled amounts of stress and maintaining elevated levels of dopamine. There is promise in this area, but it is not conclusive, and cold baths should not be used to treat clinical anxiety disorders. They are most effective when used as part of a larger strategy.