Assessing the Safety of a 26 C Indoor Temperature Limit During Rest and Light Activity in Healthy Young Adults Aged 18 to 29

What this Trial Is About

Researchers are studying whether the recommended indoor upper temperature limit of 26 C effectively protects young, habitually active adults from heat strain. Current guidelines based on older adults may not apply well to younger people who often maintain physical activity and wear more clothing during hot weather. This trial aims to evaluate changes in body temperature and cardiovascular strain during an 8-hour exposure in young adults aged 18 to 29 years. Participants will experience two conditions one involves seated rest in light clothing at 26 C and 45% humidity for 8 hours, and the other involves light hourly exercise wearing light clothing plus an added insulating layer under the same temperature and humidity. This crossover design allows comparison of physiological strain with and without added clothing and activity, reflecting typical daily behaviors. During the study, participants undergo continuous monitoring of core and skin temperatures, heart rate, blood pressure, cognitive and balance tests, and hydration status. Measurements include peak and average values over the 8-hour exposure, with assessments at the start and end of each condition. Researchers will analyze thermal comfort, cardiovascular responses, and cognitive function to determine if the current indoor temperature limit needs adjustment for young adults.

Suitability of a 26 °C Indoor Environment for Mitigating Heat Strain in Young Adults