Behind Infrared TherapyUpdated a day ago

How Infrared Heat Works Inside Your Body

The mechanism behind infrared therapy is well understood. Here's a clear breakdown of what happens physiologically, and what the research supports.

How infrared works

Traditional saunas heat the air around you, which in turn heats your body. Infrared saunas emit far-infrared radiation that is directly absorbed by the body's tissue, penetrating 3–4cm beneath the skin's surface without significantly heating the surrounding air.

This allows infrared saunas to operate at lower ambient temperatures (40–60°C vs 80–100°C in traditional saunas) while still achieving a significant thermal response inside the body.

What happens physiologically

• Core body temperature rises, triggering sweat production and cardiovascular activation
• Blood vessels dilate (vasodilation), increasing circulation throughout the body
• Heart rate increases to levels comparable to moderate exercise, sometimes referred to as "passive cardio"
• Elevated sweat output supports the elimination of metabolic waste

What the research supports

• Cardiovascular health: multiple studies associate regular infrared sauna use with improved cardiovascular markers, including reduced blood pressure and improved endothelial function
• Muscle recovery: heat exposure promotes blood flow to fatigued muscle tissue, accelerating the recovery process
• Sleep quality: the drop in core body temperature after a session signals sleep onset. Regular use has been associated with improved sleep quality.
• Stress and mood: heat exposure stimulates endorphin release and, with regular practice, has been linked to reduced cortisol levels over time

Full spectrum vs far-infrared

Full spectrum infrared saunas emit near, mid, and far-infrared wavelengths. Each penetrates to a different depth:

• Near infrared: surface tissues and skin health
• Mid infrared: joints and muscle tissue
• Far infrared: deepest penetration, core thermal response

Most published research on infrared therapy relates to far-infrared specifically. Full spectrum exposure adds additional wavelengths that may offer broader benefits, though this remains an emerging area of study.

Infrared therapy is a wellness tool, not a medical treatment. If you have any underlying health conditions, please consult a healthcare professional before use.