The Effect of Wearing the Hijab on Dry and Evaporative Heat Exchange During Moderate-intensity Exercise Performed in Hot-dry Environments
试验速览
- 阶段
- 不适用
- 状态
- 招募中
- 入组人数
- 12
- 试验地点
- 1
- 主要终点
- Dry heat loss at end exercise
研究概览
简要总结
The hijab (headscarf and cloak) is a Muslim dress, which covers the head, neck and chest, and conceals the female hair, leaving the face uncovered. It is worn by Muslim women worldwide including young Muslim women engaging in sports and exercise. As with any clothing worn on the body, the hijab can impact heat dissipation during exercise, potentially leading to increased body temperature and discomfort, especially in warmer environments. However, the extent to which the hijab may restrict heat loss remains unclear. This study aims to assess dry and evaporative heat exchange in young women performing moderate-intensity intermittent exercise in dry heat conditions (40°C, 15% relative humidity).
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Basic Science
- 盲法
- Single (Participant)
入排标准
- 年龄范围
- 18 Years 至 35 Years（Adult）
- 性别
- Female
- 接受健康志愿者
- 是
入选标准
- •healthy young female (18-35 years)
- •non smoking
- •English or French speaking
- •ability to provide informed consent
排除标准
- •claustrophobia
- •engaged in endurance training
- •acute or chronic illness
- •sedentary (not engaged in any form of physical activity)
- •physical restriction limiting physical activity
研究组 & 干预措施
No hijab
Participants rest in a thermoneutral resting condition for 30-min (baseline resting) while wearing a cotton t-shirt and shorts, after which they enter a chamber regulated at 40°C where they perform an intermittent exercise bout consisting of two, 30-min moderate-intensity exercise bouts (fixed rate of heat production of 200 W/m2), with each exercise bout separated by a 15 min rest break and a 60-min recovery following the second exercise bout.
干预措施: Exercise-heat stress with no hijab (Other)
Hijab
Participants rest in a thermoneutral resting condition for 30-min (baseline resting) while wearing a hijab over cotton t-shir and shorts, after which they enter a chamber regulated at 40°C where they perform an intermittent exercise bout consisting of two, 30-min moderate-intensity exercise bouts (fixed rate of heat production of 200 W/m2), with each exercise bout separated by a 15 min rest break and a 60-min recovery following the second exercise bout.
干预措施: Exercise-heat stress with a hijab (Other)
结局指标
主要结局
Dry heat loss at end exercise
时间窗: End of the 60-min intermittent exercise bout
Dry heat loss as assessed using a direct air calorimeter
Heart rate
时间窗: End of the 60-min intermittent exercise bout
Heart rate during final 5 minutes of each of the exercise bouts
Relative change in mean skin temperature at end exercise
时间窗: End of the 60-min intermittent exercise bout
Relative change in mean skin temperature for each 30-minute exercise bout
Evaporative heat loss at end exercise
时间窗: End of the 60-min intermittent exercise bout
Evaporative heat loss as assessed using a direct air calorimeter
Total heat loss at end exercise
时间窗: End of the 60-min intermittent exercise bout
Total heat loss as assessed using a direct air calorimeter
Body heat storage
时间窗: End of the 60-min intermittent exercise bout
Heat stored in the body for each of the exercise bouts
Change in body heat content
时间窗: End of the 60-min intermittent exercise bout
Body heat content measured at the end of intermittent exercise
Core temperature
时间窗: End of the 60-min intermittent exercise bout
Rectal temperature during final 5 minutes of each of the exercise bouts
Mean skin temperature
时间窗: End of the 60-min intermittent exercise bout
Mean skin temperature during final 5 minutes of each of the exercise bouts
Relative change in core temperature at end exercise
时间窗: End of the 60-min intermittent exercise bout
Relative increase in core temperature for each 30-minute exercise bout
Rating of perceived exertion
时间窗: End of the 60-min intermittent exercise bout
Perceived exertion assessed via a self-report questionnaire upon verbal prompting (scale is as follows: 6: indicating the participant is not exerting themselves at all with 20 indicating participant is exerting themselves maximally)
Thermal sensation A
时间窗: End of the 60-min intermittent exercise bout
Thermal sensation assessed via a self-report questionnaire upon verbal prompting (scale is as follows: 7-point scale; -3 indicating the participant is cold to +3 indicating the participant is hot)
Thermal sensation B
时间窗: End of the 60-min intermittent exercise bout
Thermal sensation assessed via a self-report questionnaire upon verbal prompting (scale is as follows: 7-point scale; 0 indicating the participant is neutral to 7 indicating the participant is extremely hot)
Thirst sensation
时间窗: End of the 60-min intermittent exercise bout
Thirst sensation assessed via a self-report questionnaire upon verbal prompting (scale is as follows: 9-point scale; 1 indicating the participant is not thirsty at all to 9 indicating the participant is very, very thirsty)
次要结局
未报告次要终点
研究者
Glen P. Kenny
Full Professor, University Research Chair
University of Ottawa