Cold immersion has existed since the days of the ancient Romans who used ice baths and continues to be practiced today through techniques, such as those of the Wim Hof Method. However, given today's culture of bio-hacking, bio-engineering, and maximising health, a more scientific understanding of cold water bathing is needed; thus we ask the question Are these water baths actually beneficial to human health? Supporters of cold therapy present an extensive range of supposed health benefits from reduction of inflammatory conditions to improvement in mood and improved immune function; whereas sceptics will point out possible adverse consequences from hypothermia to being at risk for cardiovascular stress. Through this article, we will investigate the physiological effects experienced from immersion in cold water; such as the body's physiological "fight-or-flight" response, vasoconstriction, etc., so you can be better informed about the effects that cold water will have on your health.Blood flow shifts toward the center of your body, providing oxygen and nutrients to critical systems. As the exposure to cold lasts longer than intended, assuming that it is not dangerous, your body begins to adjust to the cold through the release of endorphins (the body's natural pain reliever) and a rise in mood, often resulting in the sensation of euphoria after a plunge. The experience is often referred to as the "cold high." (Note: there is a long-standing debate about whether or not this sensation is real, but for many people it is).
In addition to releasing endorphins during cold exposure, brown adipose tissue (BAT) or "brown fat" is an active area of research regarding cold exposure and possible metabolic benefits. Unlike white fat, which stores energy, brown fat burns off calories to generate heat; this process is called thermogenesis. This activation of brown adipose tissue is one of the ways that researchers believe that cold exposure may provide metabolic benefits. When a person understands how these acute stressors initiate a cascade of effects within the body that lead to something called acclimatization and adaptations, as well as repair, they will understand how there are potential health benefits associated with cold exposure.
The Benefits of Cold Water Immersion: Separating Fact from Fiction
Among the best-understood potential benefits of cold immersion are how they contribute to reducing muscle soreness and inflammation. Many athletes routinely immerse themselves in cold water following their workouts as a method of recovering from intense workouts. Currently available research offers some support for the idea that cold water immersion results in vasoconstriction; these results may help with swelling and muscle breakdown after exercise. Additionally, they may reduce the perception of DOMS.
On the other hand, recent research supports the idea that while cold therapy may have beneficial anti-inflammatory effects, the process of inflammation also provides an important signal for muscle repair and growth. Thus, it may be counterproductive to habitual use of cold therapies on an ongoing basis by strength training athletes.
Finally, one very important area of research that has been receiving increasing attention is that of mental health and resilience. Researchers suggest that the stress that is controlled during cold exposure may occur through a process of hormesis.Regular cold exposure has been shown to improve a variety of psychological conditions. Cold exposure may increase tolerance to distress, reduce symptoms of anxiety and stress and even relieve some mild depressive symptoms. The surge of norepinephrine and endorphins is thought to lie at the heart of these psychological effects. While there is a need for more large clinical trials, preliminary research and a plethora of anecdotal accounts support significant psychological benefits of cold exposure (e.g. improved focus and greater sense of overall well-being).
The effects of cold exposure on the immune system have also been highlighted in many scientific studies. Some studies report that those who take regular cold showers report fewer sick days than those who do not. Researchers believe the mechanism behind this is due to an increase in circulation of certain immune cells (i.e. lymphocytes) and decreased inflammatory cytokines. It is also believed that cold exposure "trains" the immune system to react more effectively to infections, but research continues to show mixed evidence on this, in part because of the numerous other factors regarding a person's overall lifestyle that make it difficult to conclusively attribute improved immune response solely to cold exposure.
Potential Risks and Important Contraindications
Although there can be a variety of positive effects from cold water immersion, there are also significant risks and not everyone can tolerate it. The most immediate potential risk is the cold-water shock response that often occurs in the first minute of immersion. The reactions to cold-water shock can include: hyperventilation, a very significant increase in heart rate and/or blood pressure, feelings of panic, and risk of submersion and/or cardiac arrest for individuals who may have pre-existing undiagnosed heart problems.Those new to cold exposure should proceed carefully and gradually. Professionals recommend that you start at the end of your typical warm shower (15 to 30 seconds of cold water) while practicing controlled and deep breathing to help reduce your shock response to the cold. With continued practice, this duration can be extended over several weeks to multiple minutes. Although the water does not need to be at near-freezing temperatures to be beneficial, temperatures between 50 and 60 degrees F (10 to 15 degrees C) will produce an adequate benefit.
When using full immersion in a cold plunge pool or an open body of water, always do so with someone who can act as a spotter. You should limit your first session to one to two minutes, pay attention to your body, and exit if at any time you feel light-headed, nauseated, or too numb; the practice is about gradual exposure to manageable levels of stress, not about suffering through it. Consistent exposure of shorter durations will yield greater benefits and safety when compared to extreme, infrequent experiences.
So, are cold baths beneficial? Research indicates that they can be useful for certain situations related to muscle recovery after strenuous exercise, building mental toughness, and enhancing the immune system through a unique and beneficial reaction of the body to exposure to stressors. However, they should be viewed as one of many tools and not the ultimate solution. As always, your decision should be based on the context of your personal health and wellness goals. Cold exposure should be viewed as a complement to your overall health and fitness plan. It should not replace basic health practices like eating a well-balanced diet, exercising regularly, and sleeping Well. Lastly, cold exposure should not be treated as a fad but should be approached with caution and under the supervision of trained professionals who have experience with these therapies.
