Are you a runner who thinks ice baths are a world of pain and should be avoided at all costs? Recent evidence might change your mind.

Thanks in a large part to Wim Hof, whose recent BBC show Freeze The Fear introduced the concept of cold water therapy to viewers across the UK, attitudes towards cold water and its positive effects on muscle recovery and other disorders are beginning to change.

Many people who take part in cold water therapy or cold water swimming are quickly converted and become almost evangelical about spreading the word on the benefits. In his book What Doesn’t Kill Us, US journalist and Wim Hof sceptic Scott Carney investigates the Wim Hof Method and ends up becoming fully converted to cold water therapy combined with conscious breathing and its benefits. 'Exposure to cold helps reconfigure the cardiovascular system and combat autoimmune malfunctions. It is also a pretty darned good method for simply losing weight… More profound than that, however, is the intrinsic understanding that humans are not just bodies bounded by the barrier of their skin; we are part of the environment we inhabit.'

Sophie Hellyer, brand ambassador for outdoor change robe provider Dryrobe, is equally effusive on the subject. 'What I love about cold water therapy is that it’s like hitting a big reset button. Whatever mood I’m in, it completely refreshes me. While you’re in cold water, you can’t think about anything else other than breathing and the sensations of the water, so whatever it is that’s going on in life – stresses, injuries or whatever's on your mind – in that moment you’re just thinking about breathing, the sensations of your body and nothing else. Afterwards, you feel refreshed – it’s an empowering feeling. I’m pretty much addicted.'

Along with Hellyer, we spoke to Dan Kett, physiotherapist and cold water expert at P3RFORM, to find out why runners should add cold water therapy to their running training.

What is cold water therapy?

Cold water therapy is immersion in cold water, usually below around 14C, used as a form of recovery following intense exercise. The aim is to reduce the severity of delayed onset muscle soreness (DOMS) which is commonly experienced 24-48 hours post-exercise.

Cold water therapy can be performed safely at home through the use of ice baths or cold showers. Individuals with underlying health conditions such as angina (or other heart conditions), altered or reduced skin sensation, poor circulation or epilepsy should consult a medical professional before attempting cold water therapy.

What are the benefits of cold water therapy?

One of the main benefits of cold water therapy for runners is helping to boost recovery. 'By causing vasoconstriction of blood vessels, it reduces inflammatory processes in peripheral muscles – ie leg muscles – following exercise,' says Kett. 'Furthermore, the application of cold water therapy can reduce the sensation in the nerve endings that detect pain. Combined, these effects are used to reduce DOMS.'

This will therefore allow runners to train more frequently which, in turn, will accelerate improvements in cardiovascular fitness.

benefits of cold water therapy for runners

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'Cold water therapy is best used for recovery to allow for increased running frequency or to prepare you for optimal running performance, ie a race or PB attempt,' adds Kett. 'If you feel that your muscular strength or endurance is limiting your performance, then cold therapy may not be for you. Accepting DOMS on rest days will allow your body to adapt and become strong for long-term improvements in running performance.'

As well as boosting recovery, cold water therapy has been shown to boost fitness, mood, your immune system and even your libido. Recent studies have also shown that it can slow the onset of dementia and can help reduce anxiety.

A 2020 study in the International Journal of Environmental Research and Public Health also found that it has positive effects on the cardiovascular system, endocrine system and the psyche, including reducing the symptoms of depression.

How can you introduce cold water therapy into your training?

The first important thing to note is that you should introduce your body to cold water immersion or swimming slowly and always with other people present in a safe environment, as there are major risks including hypothermia, cardiac arrest and drowning. It can be dangerous if not undertaken with the relevant experience, training, doctor’s approval, fitness levels and professional supervision, so ensure you evaluate all risks and dangers.

Kett recommends that cold water therapy should be performed after training or on days you’re not training. 'It should not be performed before training as this can cause impairment in muscle function through shortening of connective tissues and reducing proprioceptive feedback.'

Ideally, immersion in cold water should be completed for approximately 15-20 minutes. 'If using a cold shower, it may be beneficial to start with the water warm and slowly reduce the temperature to help you gradually tolerate the cold. The aim is for the water to be 15C or less.'

In terms of cold water swimming, Hellyer says that less is more. 'Research shows that the stress of a short, cold-water dip primes the immune system to deal with a threat and thus is beneficial, but too much exposure can actually lead to immunosuppression.

'It’s not about the length of time, it’s more important just to have a quick burst. The more you do it, the more habituated you become.'

How important is breathwork in cold water therapy?

Working on your breathing is a crucial part of cold water therapy. 'When you go into cold water you might suffer from cold shock which leads to a dramatic increase in your breathing and heart rate,' says Hellyer. 'One of the natural responses to this is hyperventilation which can be dangerous, so it’s important to control your breathing. Focus on long, slow and steady exhales which trigger the parasympathetic nervous system and keeps you calm, and within a minute or so the cold shock will pass.'

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