Cooling During Exercise in the Heat
试验速览
- 阶段
- 不适用
- 状态
- 招募中
- 入组人数
- 8
- 试验地点
- 2
- 主要终点
- Change in Core temperature
研究概览
简要总结
The goal of this clinical trial is to compare the effectiveness of upper-body surface cooling with whole-body surface cooling on exercise performance while wearing firefighter clothing in the heat. The main question it aims to answer is:
• which cooling protocol best prevents an increase in core temperature during exercise in the heat?
Participants will be asked to participate three times in a 60-minute exposure (to 40 degrees C, 40% relative humidity) in which they conduct three work/rest periods including 15 minutes of stepping exercise (20 steps/minute) and 5 minutes of rest. The following three conditions will include:
- Control: no cooling garments
- Upper-body cooling: cold water-perfused cooling vest
- Whole-body cooling: cold water-perfused cooling pants and cooling vest
详细描述
The objectives are to determine thermoregulatory stress (e.g., change in skin and core temperature), physiologic stress (e.g., heart rate and metabolism), cognitive function (Mini-Cog; includes clock drawing and three-word recall), and subjective responses (e.g., thermal comfort, heat sensation, rating of perceived exertion, subjective wetness, breathing comfort) during three conditions while exercising in the heat while wearing thermal protective clothing. The conditions are control (no cooling), upper-body cooling, and whole-body cooling.
Physiologic measures:
Core temperature. Core temperature (°C) will be monitored with e-Celsius, an ingestible pill that continuously monitors, records, and wirelessly transmits core temperature.
Skin temperature. Mean skin temperature (ºC) will be measured with small metal discs (iButton, EDS) taped to the skin at the following 7 sites: forehead, chest, abdomen, upper arm, lower arm, anterior thigh, and anterior calf.
Heart rate and respiration. A Hexoskin shirt will be worn. Sensors in the shirt measure heart rate and chest expansion for breathing indicators.
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Prevention
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 49 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Age 18-49 years.
- •Meet the criteria on the CSEP Get Active Questionnaire
- •Answer 'no' to questions in the Screening Questionnaire.
排除标准
- •Outside the accepted age bracket.
- •Not meeting the criteria on the CSEP Get Active Questionnaire or the Screening Questionnaire.
结局指标
主要结局
Change in Core temperature
时间窗: Times 0, 30, 50, 70 and 85 min
Core temperature will be measured with a radio pill that is ingested 2 hours pre-trial.
次要结局
- Change in Mental performance(Times 0, 30, 50, 70 and 85 min)