The Benefits (and Drawbacks) of Hitting the Sauna after Working out, According to Pros

Perhaps one of the biggest boons to using a sauna after your workout is the effects it can have on muscle recovery. The aforementioned study, for example, found that 30-minute sessions in an infrared sauna decreased post-workout muscle soreness and boosted recovery. In particular, men performed better during a countermovement jump test (an exercise that measures lower-body power) when they sat in an infrared sauna after their 40-minute endurance workout than when they sat in a normal room (no sauna). This suggests that infrared saunas help muscles and nerves recover more quickly after exercise.

"The biggest reason most athletes like the sauna is it improves recovery time", said John Gallucci, Jr., A.T.C., DPT, CEO of JAG-ONE Physical Therapy and medical coordinator for US Major League Soccer. The heat from the sauna enhances the circulation of oxygen-rich and nutrient-rich blood throughout your body. This, in turn, helps repair muscles damaged by exercise, so you can get back in the saddle faster.

"Whenever you increase the circulation of oxygen-rich blood, you're going to see improvements in cardiovascular function", Gallucci said.

In fact, a 2019 study in Complementary Therapies in Medicine found that the changes that happen to your heart when you sit in a sauna are similar to those you get from a short, moderate-intensity cardio workout.

"We see overall heart rate and core temperature increase, as well as improved blood pressure and redistribution of blood throughout the body's tissues", said Shawn M. Houck, D.P.T., a board-certified clinical specialist in sports physiotherapy and clinic director at Physical Therapy Central.

All of those effects may help lower your chances of heart disease and high blood pressure (hypertension). Findings from a 2015 JAMA Internal Medicine study that included 2300 Finnish men reveal that the risk of death from heart disease was 27 percent lower among those who reported using a sauna two to three times per week than those who said they used it only once a week.

However, it's always a good idea to check in with your doctor before using a sauna to ensure you're not at a risk of any possible heart complications.

Well, not literally, but it does help you relax. Hitting the sauna after your workout gives you a chance to unwind before heading to your next destination. You get to hit "pause" on your whirlwind day and spend a few minutes sitting in a quiet, calm environment.

Sitting in a sauna is an ideal opportunity to practise stress management techniques such as deep breathing and meditation, said Houck.

If mindfulness or deep breathing don't appeal to you though, consider using your time in the sauna to do some light stretching or enjoy a moment of silence.

You lose plenty of fluids when you work out—even if you're not dripping in sweat. So, if you don't stay on top of replacing those fluids and electrolytes as you go, you could be in trouble if you hop in the sauna immediately afterwards.

You could get dizzy, pass out or get severe muscle cramps. Worst-case scenario, you could develop heatstroke, a life-threatening condition caused by your body overheating. Without immediate treatment, heatstroke can damage your muscles and organs and may be fatal, according to the Mayo Clinic.

"So it's very, very important that, as a safety measure, athletes ensure that they're hydrated before they enter the sauna", Gallucci said.

While a healthy dose of sauna-sitting is generally great for the heart, it's not a good idea if your heart's already stressed out. In particular, if you have high-risk heart disease, chest pain (angina) or hypertension, according to Harvard Health.

The reason? Heat causes your body to cool itself by shifting blood from major organs to underneath the skin. This causes the heart to pump more blood, which puts the vital organ under more stress, according to the American Heart Association.

In many people, this stress is good, like the kind of stress you get from exercise. But for hearts that are already dealing with more than they can handle, the added stress from heat can be too much.

However, it's worth noting that saunas may be generally safe for people who have stable heart disease or even mild heart failure, according to Harvard Health. Though these people should still get checked by their doctors before using a sauna to be safe.

A 2013 study in Human Reproduction reveals that the high temperatures in saunas cause a temporary reduction in sperm count in men with otherwise normal levels. After attending two 15-minute sauna sessions per week for three months, the participants reported a lower sperm count. Once they stopped using the sauna, their sperm levels returned to normal.

"The testicles are extremely sensitive to heat and extended periods of high heat can reduce sperm function and motility", said DJ Mazzoni, CSCS, M.S. and a medical reviewer at Illuminate Labs. "This suggests that men actively trying to conceive should avoid saunas, although for most men, the benefits seem to outweigh the risks".