Walk into any wellness facility and you will likely encounter two types of sauna: the traditional Finnish sauna, which heats the air around you using a stove and stones, and the infrared sauna, which uses light panels to deliver radiant heat directly to your body. Both make you sweat. Both have documented health benefits. But they work through fundamentally different mechanisms, and understanding those differences is the key to choosing the right modality — or knowing when to use each.
At ALYZE, we offer both. Not because we believe one is universally superior, but because they serve different purposes within a comprehensive recovery and longevity protocol. The right choice depends on your goals, your current health status, and where you are in your training cycle.
A traditional Finnish sauna heats the ambient air to temperatures between 80 and 100 degrees Celsius (176 to 212 degrees Fahrenheit). The heat source — typically an electric or wood-burning stove topped with volcanic stones — radiates thermal energy into the room. Your body temperature rises because it is surrounded by extremely hot air. Humidity is low, typically between 10 and 20 percent, though water can be ladled onto the stones to create brief bursts of steam (known as loyly in Finnish).
This convective heating drives your core temperature up rapidly, triggering a robust cardiovascular response. Heart rate can increase to 100-150 beats per minute, blood vessels dilate significantly, and your body mounts a powerful thermoregulatory response. The result is a deep, intense heat experience that challenges the body in a way analogous to moderate-intensity exercise.
Infrared saunas operate at much lower ambient temperatures — typically 45 to 65 degrees Celsius (113 to 150 degrees Fahrenheit). Instead of heating the air, infrared panels emit light in the far-infrared spectrum (wavelengths of approximately 5.6 to 1000 micrometers), which penetrates the skin and heats your body directly. Think of it like standing in sunlight on a cool day — your skin warms even though the air temperature is low.
Because infrared energy penetrates roughly 3 to 4 centimeters into tissue, proponents argue that it produces a "deeper" heat than traditional saunas. While this claim has some basis in physics, the practical difference is more nuanced. Infrared saunas do raise core body temperature, but more gradually and to a lesser degree than traditional saunas. The sweat response is real, and the experience is often described as more tolerable — particularly for people who find the intense heat of a Finnish sauna uncomfortable.
The question is not which sauna is better. The question is which mechanism serves your body's needs right now — and the answer may change from week to week.
This is where an honest assessment matters. The vast majority of rigorous, large-scale sauna research has been conducted on traditional Finnish saunas. The landmark Kuopio Ischaemic Heart Disease study — the one showing 40 percent reductions in all-cause mortality — used traditional saunas exclusively. When researchers cite dramatic cardiovascular and longevity benefits, they are almost always referring to traditional dry-heat sauna protocols.
Infrared sauna research exists, but the studies tend to be smaller, shorter in duration, and more frequently focused on specific therapeutic applications rather than long-term mortality outcomes. That said, the existing evidence is genuinely promising:
Traditional saunas are more physiologically demanding. The extreme ambient temperatures create a more powerful cardiovascular stimulus, which is precisely why the longevity data is so compelling — the body is forced to adapt to significant thermal stress. However, this intensity is not always appropriate. During periods of illness, overtraining, or high-stress phases, the gentler heat of an infrared sauna may provide recovery benefits without adding additional physiological burden.
Infrared saunas require longer sessions to achieve comparable core temperature elevation — typically 30 to 45 minutes versus 15 to 20 minutes for traditional saunas. They also have shorter warm-up times (15 minutes versus 30 to 45 minutes for a traditional sauna), which can make them more convenient for tighter schedules.
For chronic pain, fibromyalgia, and joint conditions, infrared saunas have a stronger evidence base. For cardiovascular conditioning and longevity, traditional saunas have dramatically more supporting data. For general recovery and relaxation, both modalities are effective.
Rather than declaring one type of sauna the winner, consider your current goals and conditions:
The reason we built both modalities into our facility is simple: your needs are not static. An athlete in a heavy training block may alternate between Finnish sauna sessions for cardiovascular conditioning and infrared sessions for targeted recovery. A member managing chronic pain may rely primarily on infrared while incorporating occasional traditional sessions as their tolerance improves.
At ALYZE, your recovery protocol is not a one-size-fits-all prescription. It is built around your data — your bloodwork, your body composition, your training load, your stress markers. The sauna is one tool in a much larger system, and knowing which tool to reach for on any given day is what separates casual wellness from genuine optimization.
Bountiful, Utah · alyze.health
