Fan Use During Extreme Heat: Safe Thermal Limits
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 10
- 试验地点
- 2
- 主要终点
- Blood Pressure
研究概览
简要总结
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.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Prevention
- 盲法
- None
入排标准
- 年龄范围
- 19 Years 至 39 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Body mass index less than 30
- •male or female
- •ability to tolerate hot environments for a prolonged period (e.g. >2 h)
排除标准
- •Any respiratory disease
- •Any cardiovascular disease, including hypertension
- •not currently on any medication (except oral contraceptives)
结局指标
主要结局
Blood Pressure
时间窗: At baseline (e.g. 0 minutes), and every 10 minutes of exposure up to 180 minutes
Measured with an electrocardiogram-gated automated cuff
Rate Pressure Product
时间窗: At baseline (e.g. 0 minutes), and every 10 minutes of exposure up to 180 minutes
Heart Rate
时间窗: At baseline (e.g. 0 minutes), and every minute for the 180 minute experimental trial
Measured with a 3-lead electrocardiogram
Skin Temperature
时间窗: At baseline (e.g. 0 minutes), and every minute for the 180 minute experimental trial
Measured at 4 skin locations (chest, arm, thigh, and calf) using wireless iButtons affixed to the skin with surgical tape
Core Temperature
时间窗: At baseline (e.g. 0 minutes), and every minute for the 180 minute experimental trial
rectal temperature measured with a pediatric grade thermistor probe
Whole-Body Sweat Rate
时间窗: At baseline (e.g. 0 minutes), and every minute for the 180 minute experimental trial
Net difference in body mass (pre versus post) using a balance scale placed below the chair of the participant
次要结局
- Thermal Sensation(At baseline (e.g. 0 minutes), and every 10 minutes for the 180 minute experimental trial)
- Thermal comfort(Assessed at baseline (e.g. 0 minutes), and every 10 minutes for the 180 minute experimental trial)
研究者
Nicholas Ravanelli
Assistant Professor
Lakehead University