passive heat exposure raises core body temperature after ~60 minutes, with skin responding within the first 20
Core temperature during passive heat exposure showed a time-condition interaction, with clear increases not observed until 60 minutes of exposure, while skin temperature responded quickly within the first 20 minutes and then remained fairly constant.
What this means for you
Your skin adapts to heat quickly, but the deeper physiological shift — a rise in core temperature — takes a full hour to build. That sustained internal warmth is what drives many of the recovery and circulation responses people associate with heat-based wellness sessions, so duration genuinely matters.
The published research
The cardio‐respiratory effects of passive heating and the human thermoneutral zone
Physiological Reports · 2021
This page describes a documented finding about the underlying wellness technology. It is not a marketing claim about any specific device. For information about HOCATT specifically, visit hocatt.com.