By Tricia Beaudry, Licensed Esthetician, Nine-Time Marathon Runner & Founder of Wellness Path Studio
A few years ago, cold plunging was something elite athletes and extreme wellness enthusiasts did. Today it is one of the fastest-growing wellness practices in the world. Ice bath sales surged from under 1,000 units per month to over 90,000 in a single year. Social media is full of people grimacing through icy water with expressions that somehow look both miserable and triumphant at the same time.
So what is actually going on? Is cold plunging genuinely beneficial, or is this another wellness trend that sounds more impressive than it is?
As someone who has spent years studying how the body responds to therapeutic stress — and as a marathon runner who has used cold immersion as part of my own recovery practice — I want to give you the most honest, research-grounded answer I can. Because the science is genuinely interesting, and the benefits are real. But they are also more nuanced than most social media posts would have you believe.
What Happens in Your Body the Moment You Enter Cold Water
Understanding cold plunging starts with understanding what your body does the instant it hits cold water below 59 degrees Fahrenheit.
Your body triggers what researchers call the cold shock response — a rapid series of physiological reactions initiated by cold receptors in your skin. Blood vessels constrict sharply, diverting blood flow away from the extremities toward your core and vital organs. Your heart rate surges. You gasp involuntarily. Your sympathetic nervous system activates hard and fast.
This is your body doing exactly what it is designed to do — responding to a perceived threat with a full physiological mobilization. And here is the key insight that explains why cold plunging works: that mobilization, done deliberately and consistently, trains your body to handle stress more effectively over time.
Research shows that the cold shock response reaches its peak within approximately 30 seconds of immersion and begins to adapt over the first two to three minutes. Perhaps most importantly, repeated cold water immersion produces habituation after approximately four sessions — what felt overwhelming the first time becomes a controlled, manageable challenge within just a few weeks of consistent practice.
The Benefits: What the Research Actually Shows
Stress Reduction
A comprehensive 2025 systematic review published in PLOS One, analyzing 11 studies with over 3,000 participants, found that cold-water immersion produced significant stress reduction when measured 12 hours after exposure. Researchers theorize this delayed effect occurs because the initial cold shock activates your sympathetic nervous system in a controlled burst, followed by a compensatory shift toward parasympathetic dominance — the rest and recover state. In other words, the stress of the plunge trains your nervous system to recover from stress more efficiently.
Mood and Mental Clarity
This is one of the most talked-about benefits of cold plunging, and the neurochemical basis is real. Cold exposure produces a rapid and significant increase in norepinephrine — a neurotransmitter involved in attention, focus, and mood — along with a substantial and sustained elevation in dopamine that persists for hours after the session. This is why so many people describe cold plunging as producing an unusually clear, calm, focused state of mind that is hard to replicate with other practices.
As a runner, I can tell you that the mental clarity after a cold plunge is one of the most consistent and immediately noticeable effects. It is not a caffeine buzz. It is something calmer and more sustained — a genuine shift in alertness and mood that lasts through the morning.
Cellular Health and Longevity
This is the most exciting new research in the field. A 2025 study conducted at the University of Ottawa found that just seven days of consistent cold water immersion significantly improved autophagic function — the cell's own recycling system — which is a critical cellular protective mechanism. When autophagy works well, cells clear out damaged components more efficiently, reducing cellular stress and supporting long-term health.
The researchers found that while autophagy was initially disrupted by the acute cold stress, consistent exposure over a week led to increased autophagic activity and decreased cellular damage signals — suggesting that cold acclimation may help the body effectively cope with extreme environmental conditions and contribute to long-term health.
This research points toward cold plunging as a genuine longevity tool, not just a recovery modality. We are still in early days with this research, but the direction is compelling.
Reduced Sick Days and Immune Support
The 2025 PLOS One meta-analysis found that people who used cold plunges experienced a decrease in sickness absences and improvements in their quality of life. Separate research has documented that cold exposure over 30 days was associated with a meaningful reduction in work absences related to illness. The mechanism appears to involve a hormetic immune response — the cold serves as a controlled stressor that trains the immune system to respond more efficiently.
Recovery from Exercise
Cold water immersion has been used in athletic recovery settings for decades, and the evidence here is solid. Immersion reduces inflammation, decreases muscle soreness, and supports faster recovery between training sessions by improving circulation and clearing metabolic waste from fatigued muscles.
As someone who ran three marathons in a single year during my most intense running period, I can speak to this personally. Cold immersion after long runs made a measurable difference in how quickly I was able to train again. The reduction in delayed-onset muscle soreness is one of the most consistently reported and experienced benefits of cold plunging across both research and athlete testimony.
Sleep Quality
The 2025 PLOS One analysis found that regular cold-water immersion may help reduce stress levels and improve sleep. The deep relaxation that follows the acute activation of a cold plunge — particularly when the session ends and your body begins its warm-up response — supports the kind of parasympathetic nervous system state that underlies restorative sleep.
What Cold Plunging Does NOT Do — Being Honest
I believe the wellness industry does itself a disservice by overselling things, so let me be direct about what the research does not support.
Cold plunging is not a meaningful weight loss tool. A typical three to five minute cold plunge burns approximately 15 to 25 calories. That is roughly equivalent to a short walk. Anyone telling you cold exposure is a significant fat loss strategy is exaggerating.
The immune and mood benefits may be shorter-term than claimed. Researchers found little evidence to support strong claims about cold-water immersion boosting immunity and mood on a sustained basis. The stress reduction and mood benefits appear real — but they are most consistent immediately following exposure rather than producing permanent baseline changes.
Cold plunging may temporarily blunt muscle growth if used immediately after strength training. Research suggests that cold immersion right after a resistance training session can interfere with the muscle protein synthesis process. If building muscle is your primary goal, timing matters — consider cold plunging earlier in the day rather than immediately post-lifting.
It is not right for everyone. People with cardiovascular conditions, cold sensitivity, Raynaud's disease, or other health concerns should consult a physician before starting cold plunging. The initial cold shock response produces a significant spike in heart rate and blood pressure that requires a healthy cardiovascular system to handle safely.
How to Start: A Practical Protocol
If you are new to cold plunging, the most important principle is gradual acclimation. More is not better — especially at first.
Temperature: Start at 55 to 60 degrees Fahrenheit and work toward 50 to 55 degrees as you acclimate. The most well-researched therapeutic range is 50 to 59 degrees Fahrenheit.
Duration: Begin with 2 to 3 minutes and build toward 5 minutes as your tolerance develops. Research consistently shows that the therapeutic window is well within 5 minutes — you do not need to push beyond that to experience the benefits.
Frequency: Three to five sessions per week is optimal for most people. Daily use is not necessary and may reduce the adaptive response you are training for.
Breathing: Slow, controlled breathing is the key to staying comfortable. The cold shock response causes an involuntary urge to hyperventilate — breathing slowly and deliberately through the nose overrides that response and makes the experience significantly more manageable.
Timing: Morning plunges tend to produce the most energizing effect. Evening plunges can support sleep but are best done at least 90 minutes before bed to allow your core temperature to normalize.
Pair with your sauna: For maximum benefit, combine your cold plunge with a sauna session. The alternating heat and cold creates the contrast therapy vascular pumping effect — one of the most powerful recovery and wellness protocols available. End on heat for relaxation and sleep support; end on cold for energy and alertness.
Setting Up a Cold Plunge at Home
Home cold plunging has become genuinely practical. Temperature-controlled units maintain precise water temperatures without requiring you to add ice daily — removing the biggest friction point from making this a consistent practice.
At Wellness Path Studio I have curated a selection of cold plunge tubs designed for home use — from straightforward, effective tubs at accessible price points to premium temperature-controlled systems for those who want a seamless daily practice. Every option in the collection has been selected because it removes barriers to consistency, which is ultimately what determines whether you experience the benefits.
If you are not sure where to start, reach out directly. I am happy to help you find the right fit for your space, your goals, and your budget.
— Tricia
Disclaimer: This article is for informational and educational purposes only and does not constitute medical advice. Cold water immersion is not intended to diagnose, treat, cure, or prevent any disease or medical condition. Please consult your physician before beginning cold water immersion, particularly if you have cardiovascular conditions, cold sensitivity, or any other health concerns. Cold water immersion is not recommended during pregnancy.