Cold Plunge and Sauna: What Does the Research Actually Say?

It seems like everywhere you look these days, someone is sitting in an ice bath, talking about cold plunges, or posting pictures from a sauna.

A few years ago, these recovery methods were mostly reserved for professional athletes and high-performance training facilities. Today, they're showing up in backyards, garages, gyms, and wellness centers all over Scottsdale and Phoenix.

As a physical therapist, I get asked about them all the time.

"Should I be cold plunging?"

"How often should I use a sauna?"

"Will it help my recovery?"

The short answer is yes—both can have benefits.

The longer answer is that it depends on your goals.

And that's where a lot of the online conversation gets lost.

Let's start with cold plunges

Cold water immersion has been used in sports medicine for decades.

The idea is fairly straightforward. Exposure to cold temperatures creates a physiological response that can temporarily reduce pain, decrease perceived soreness, and influence inflammation.

Many athletes report feeling refreshed and recovered after a cold plunge.

And the research generally supports that.

Several studies published in The British Journal of Sports Medicine have demonstrated that cold water immersion can reduce post-exercise soreness and improve perceived recovery following intense training sessions.

That's the good news.

The caveat is that more isn't always better.

Can cold plunges interfere with strength gains?

This is where things get interesting.

Research has shown that frequent cold water immersion immediately after strength training may blunt some of the muscular adaptations associated with resistance training.

In simple terms:

If your primary goal is maximizing muscle growth and strength development, jumping into an ice bath after every lifting session may not be ideal.

Your body needs a certain amount of inflammation and recovery signaling to adapt and get stronger.

Constantly trying to suppress that process can potentially reduce those adaptations.

That's why context matters.

A professional athlete competing tomorrow has different recovery goals than someone trying to build muscle over the next six months.

What about sauna use?

If cold plunges get the attention, saunas may actually have the stronger long-term research.

Studies published in JAMA Internal Medicine and other journals have found associations between regular sauna use and improvements in cardiovascular health, recovery, stress management, and overall longevity.

Regular sauna exposure appears to create adaptations that are remarkably similar to aerobic exercise.

Heart rate increases.

Blood vessels dilate.

Circulation improves.

Many people also report improvements in sleep quality, stress levels, and overall well-being.

From a recovery standpoint, sauna use can help promote relaxation and improve circulation to tissues throughout the body.

How I view cold plunges and sauna as a physical therapist

I think both tools can be valuable.

The key is understanding what they're designed to do.

Neither one fixes an injury.

Neither one replaces physical therapy.

Neither one corrects mobility restrictions, strength deficits, or poor movement patterns.

But both can absolutely support an overall recovery strategy.

For example, if someone is training hard, sleeping well, eating well, and following a structured rehabilitation program, adding sauna or cold plunge exposure may provide additional benefits.

If someone is relying on cold plunges while ignoring their strength program, that's a different story.

Recovery tools work best when the fundamentals are already in place.

What do I personally recommend?

For most active adults and athletes, I generally recommend using these tools strategically rather than obsessively.

If your goal is recovery after a particularly demanding event, workout, tournament, or competition, a cold plunge can be useful.

If your goal is long-term health, stress management, and cardiovascular benefits, regular sauna use may provide more value.

And if you enjoy both?

There's nothing wrong with combining them.

The most important thing is consistency.

The best recovery strategy is usually the one you'll actually stick with.

What about injury recovery?

This is where I see some misconceptions.

People often ask whether cold plunges or saunas will heal an injury faster.

The answer is usually no—not directly.

An Achilles tendon doesn't heal because you sat in cold water.

A shoulder doesn't regain mobility because you spent twenty minutes in a sauna.

The actual healing occurs when the tissue is progressively loaded and challenged appropriately.

That's where physical therapy comes in.

At Modern Movement Physical Therapy in Scottsdale, I focus on identifying why an injury developed in the first place and then building a plan to restore mobility, strength, and function.

Recovery modalities can support that process.

But they don't replace it.

The bottom line

Cold plunges and saunas are both valuable tools.

The research suggests cold water immersion can improve recovery and reduce soreness, while sauna use may offer impressive cardiovascular, recovery, and longevity benefits.

The key is understanding their role.

They are supplements to a well-designed health and fitness plan—not substitutes for one.

At Modern Movement Physical Therapy in Scottsdale, I encourage patients to focus on the fundamentals first: movement, strength, recovery, sleep, and consistency.

Once those pieces are in place, tools like cold plunges and saunas can provide an additional edge.

And who doesn't like an extra edge?

Take good care of your body, it's the only one you have.

Yours in health,

Dr. Michael Price