Clinical trial NCT06584903: Safe Indoor Temperature Limit for Fans
Official title: Fan Use During Extreme Heat: Safe Thermal Limits
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Heat Exposure
Healthy
Young Adults
Fans
Keywords: indoor temperature
core temperature
heart rate
electric fans
cardiovascular strain
Lead sponsor: Lakehead University
Sponsor class: OTHER
First posted: 2024-09-05
Enrollment: 10
Sex: ALL
Minimum age (years): 19
Maximum age (years): 39
Standard ages: ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: CROSSOVER
Primary purpose: PREVENTION

Brief summary: Extreme heat events are a significant global threat to health and wellbeing, and result in more morbidity and mortality than all other natural disasters combined. Thus, a key priority is identifying effective and accessible heat resilience solutions to protect individuals from the potentially fatal consequences of heat stress. Within a range of ambient conditions, a fan has been recognized a low-cost heat resilience solution. However, when ambient temperatures exceed skin temperatures (e.g., above 35°C), a fan will incur greater dry heat gain which may be counterbalanced with evaporation of sweat from the skin surface. However, at a critical indoor temperature, the rate of heat gain will exceed the rate of evaporation resulting in net heat gain. The critical indoor temperature has yet to be determined. The purpose of this present study is to identify the indoor temperature at which a fan results in greater cardiovascular and thermal strain relative to still air in young adults using a simulated heat wave scenario of a warming room.


Eligibility criteria: Inclusion Criteria:

* Body mass index less than 30
* male or female
* ability to tolerate hot environments for a prolonged period (e.g. \&gt;2 h)

Exclusion Criteria:

* Any respiratory disease
* Any cardiovascular disease, including hypertension
* Diabetes
* not currently on any medication (except oral contraceptives)

Primary outcomes:
measure: Blood Pressure
timeFrame: At baseline (e.g. 0 minutes), and every 10 minutes of exposure up to 180 minutes
measure: Rate Pressure Product
timeFrame: At baseline (e.g. 0 minutes), and every 10 minutes of exposure up to 180 minutes
measure: Heart Rate
timeFrame: At baseline (e.g. 0 minutes), and every minute for the 180 minute experimental trial
measure: Skin Temperature
timeFrame: At baseline (e.g. 0 minutes), and every minute for the 180 minute experimental trial
measure: Core Temperature
timeFrame: At baseline (e.g. 0 minutes), and every minute for the 180 minute experimental trial
measure: Whole-Body Sweat Rate
timeFrame: At baseline (e.g. 0 minutes), and every minute for the 180 minute experimental trial
Secondary outcomes:
measure: Thermal Sensation
timeFrame: At baseline (e.g. 0 minutes), and every 10 minutes for the 180 minute experimental trial
measure: Thermal comfort
timeFrame: Assessed at baseline (e.g. 0 minutes), and every 10 minutes for the 180 minute experimental trial
Other outcomes:
Locations:
city: Thunder Bay
country: Canada
facility: Lakehead University
state: Ontario
Study officials:
affiliation: National University of Singapore
name: Nicholas Ravanelli, PhD
role: PRINCIPAL_INVESTIGATOR
References: