Up to 70% of cardiac output is directed to the skin in a hot, dry sauna, causing central and peripheral arteries to relax and allow maximal blood flow.

“That gradient shunts up to 70 % more cardiac output to the skin, mimicking moderate-intensity cardio without moving a muscle.”

“Enhanced blood flow: the heart pumps up to 70% more blood, similar to intense aerobic exercise (zone 2-3).”

“We'll see if the increased humidity increases core body temp and heart rate.”

“The heart pumps up to 70% more blood, similar to intense aerobic exercise (zone 3), with 50-70% of this increased flow re-directed to the skin, promoting vasodilation and improved skin circulation.”

“Dry (Finnish) sauna delivers low-humidity heat, so your skin hits 40 °C in minutes while core creeps up only ~1 °C. That gradient shunts up to 70 % more cardiac output to the skin, mimicking moderate-intensity cardio without moving a muscle.”

“While HSPs are a major driver of sauna benefits, other mechanisms including increased cardiac output and blood flow (exercise mimetic), vascular remodelling and adaptation, as well as sweating all contribute to the benefits.”

“chiefly among them is the sauna in some ways mimics cardiovascular exercise so when you sit in the sauna in a hot sauna your heart rate elevates to 100 to 150 beats per minute which really is equivalent to moderate intensity physical exercise also plasma volume expands and increases and blood flow increases to the heart and this lowers cardiovascular strength so your heart has to do less work for each beat that it's pumping blood you know throughout your body to to deliver oxygen to your tissues so it's lowering cardiovascular strain”

“So, you know, the sauna is causing vasoddilation. It's doing a lot of the same, like I said, it's increasing cardiac output while you're doing it. A lot of the same things that's happening when you're engaging in moderate intensity physical activity.”