THE SCIENCE BEHIND CRYOTHERAPY
HOW IT PRODUCES EXTREME COLD?
INTRODUCTION
Cryotherapy, meaning “cold therapy,” is a treatment method that uses extreme cold to promote recovery, reduce pain, and improve overall well-being. Whether it’s whole-body cryotherapy (WBC) or localized treatments, cryotherapy can drop temperatures to as low as -200°F (-129°C) in just a few minutes. But how does cryotherapy produce this intense cold, and how does the body respond to such freezing temperatures?
In this blog, we’ll explore how cryotherapy delivers such extreme colds and explain the mechanisms behind this fascinating treatment method, supported by scientific research.
Cryotherapy uses liquid nitrogen to generate the freezing temperatures needed for effective treatment. Liquid nitrogen is a cryogenic liquid that boils at an extremely low temperature of -196°C (-320°F). When it is exposed to the air, liquid nitrogen turns into a vapor, rapidly lowering the surrounding air temperature. This makes it ideal for cryotherapy, where a super-cold environment is necessary to trigger the body’s healing mechanisms.
WHOLE-BODY CRYOTHERAPY (WBC)
In whole-body cryotherapy, individuals enter a chamber or tank that is filled with cold nitrogen vapor. The temperatures in these chambers typically range from -160°F to 220°F (-110°C to -140°C). A typical session lasts between two and four minutes to prevent the body from becoming dangerously cold while still achieving the therapeutic benefits. The air inside the chamber is extremely dry, which allows the body to withstand such freezing conditions without freezing the skin. This rapid cold exposure shocks the body, triggering a cascade of physiological responses that promote healing and recovery.
LOCALIZED CRYOTHERAPY
On the other hand, localized cryotherapy focuses on a specific area of the body, such as a joint, muscle, or injury site. In these treatments, the cryotherapy machine directs cold nitrogen vapor at the target area, lowering the skin temperature significantly for a shorter duration than WBC. Localized cryotherapy devices use the same principles as whole-body chambers, but the treatment is more focused and controlled.
THE PHYSIOLOGICAL EFFECTS OF EXTREME COLD EXPOSURE
Cryotherapy’s effectiveness comes from the way the body reacts to extreme colds. The rapid drop in temperature creates a “shock” to the system, activating the body’s natural survival mechanisms.
- Vasoconstriction
The first response to cold exposure is vasoconstriction, where the blood vessels constrict to reduce blood flow to the skin and extremities. This is the body’s way of preserving heat and protecting vital organs. By limiting blood flow to the surface, cryotherapy helps reduce inflammation and swelling in affected areas. A study in the Journal of Athletic Training highlights how cryotherapy minimizes muscle damage and decreases pro-inflammatory markers after exercise.
- Cold Shock Proteins
Cryotherapy stimulates the production of cold shock proteins, which help protect cells from cold-induced damage. Cold shock proteins play an essential role in cellular repair and recovery. Research published in The American Journal of Physiology shows that cold shock proteins help promote tissue healing and muscle recovery following cold exposure.
- Endorphin Release
The extreme cold of cryotherapy also triggers the release of endorphins, which are natural painkillers produced by the body. This is why many people have reported feel euphoric or relaxed after a cryotherapy session. These endorphins not only help reduce pain but also improve overall mood.
- Increased Metabolism
Another fascinating response to cryotherapy is the temporary increase in metabolic rate. The body works hard to warm itself back up after cold exposure, which boosts calorie burning. A study in the European Journal of Applied Physiology found that regular cryotherapy sessions can lead to an increase in metabolic activity and fat oxidation.
KEY FACTORS BEHIND THE EFFECTIVENESS OF CRYOTHERAPY’S COLD EXPOSURE
- Duration and Intensity
For cryotherapy to be effective, the cold exposure must be short yet intense. Sessions typically, last between two and four minutes because longer exposure can lead to frostbite or other cold-related injuries. During this brief window, the extreme cold, shocks the body, allowing the physiological benefits to occur without causing harm. The Journal of Thermal Biology notes that this balance between time and intensity is crucial for maximizing benefits while minimizing risks.
- Controlled Environment
Cryotherapy chambers and devices are carefully controlled to ensure safe and uniform cold distribution. The nitrogen vapor used in the treatment is non-toxic and does not come into direct contact with the skin, as it could cause frostbite if mishandled. The environment inside the chamber is dry, allowing the skin to withstand lower temperatures than would be possible in humid or wet conditions.
- Cold Tolerance
Different individuals may respond differently to cryotherapy, depending on factors like their body fat percentage, health status, and tolerance to cold. However, scientific studies have consistently shown that cryotherapy is safe and effective when administered properly. According to research in the Scandinavian Journal of Medicine & Science, individuals who are regularly exposed to cold therapy experience fewer negative effects from the cold and recover faster from physical exertion.
CONCLUSION
Cryotherapy’s effectiveness lies in its ability to deliver intense colds in a controlled environment for a short duration, making it a powerful tool for athletes, individuals with chronic pain, and those looking for alternative wellness treatments. By understanding the science behind cryotherapy’s cold exposure, we can better appreciate its benefits and how it supports the body’s natural healing processes.
REFERENCES:
- Bleakley, C. M., & Davison, G. W. (2010). Cryotherapy and inflammation: Evidence for a potential role in recovery from exercise-induced muscle damage. Journal of Athletic Training, 45(5), 516–529.
- Bickler, P. E., & Buck, L. T. (2007). Hypoxia tolerance in reptiles, amphibians, and fishes: life with variable oxygen availability. The American Journal of Physiology, 283(3), 517-528.
- Hohenauer, E., Costello, J. T., Stoop, R., & Clarys, P. (2015). Whole-body cryotherapy and its effect on recovery after exercise: a systematic review. Frontiers in Physiology, 6, 278.
- Lombardi, G., Ziemann, E., & Banfi, G. (2017). Whole-body cryotherapy in athletes: From therapy to stimulation. Journal of Thermal Biology, 69, 1-9.
- Westerlund, T., Uusitalo-Kylmälä, L., & Mikkelsson, M. (2004). Cryotherapy in sports medicine. Scandinavian Journal of Medicine & Science in Sports, 14(4), 198-205.
- Lubkowska, A., Szygula, Z., & Chlubek, D. (2012). Whole-body cryotherapy – Physiological and clinical effects of cold therapy. Archives of Medical Science, 8(6), 282–289.
- Banfi, G., Lombardi, G., Colombini, A., & Melegati, G. (2010). Whole-body cryotherapy in athletes. Sports Medicine, 40(6), 509–517.