Synopsis: Research from Cardiff Metropolitan University found Clearlight infrared saunas deliver deep core heating and physiological benefits comparable to traditional Finnish saunas.
A recent study conducted at Cardiff Metropolitan University examined how effective a Clearlight far-infrared sauna is at raising core body temperature and creating the same type of beneficial heat response typically associated with traditional saunas. The researchers specifically wanted to challenge previous claims suggesting infrared saunas only heat the skin and muscles without significantly affecting the body’s core temperature. Using a Clearlight Sanctuary sauna set to 149°F for 45 minutes, the study found that participants experienced an average core temperature increase of approximately 2.5°F — which is a very meaningful rise and comparable to what is seen in traditional Finnish saunas. In simple terms, the Clearlight sauna was able to heat the body deeply enough to create a full-body heat response, not just surface warmth.
The study also found several important physiological benefits linked to heat conditioning and recovery. Participants experienced increased heart rates, improved circulation, healthy reductions in blood pressure, and significant sweating responses — all signs that the body was actively adapting to the heat in a positive way. Researchers also observed an 11.6% reduction in plasma volume, which is especially relevant for athletes because it is one of the early adaptations associated with improved performance and heat tolerance in demanding environments. Overall, the researchers concluded that the Clearlight infrared sauna produced physiological responses similar to those seen in traditional sauna therapy and other proven heat-training methods, showing strong potential for wellness, recovery, cardiovascular health, and athletic performance applications.
