Heat Stress, Temperature Change, Body
Conditions
Keywords
Core temperature, Exercise, Females, Garment, Heat strain, Thermoregulation, Hot weather
Brief summary
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).
Interventions
OTHERExercise-heat stress with no hijab
Participants perform exercise in the heat with no hijab
OTHERExercise-heat stress with a hijab
Participants perform exercise in the heat with a hijab
Sponsors
University of Ottawa
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
BASIC_SCIENCE
Masking
SINGLE (Subject)
Eligibility
Sex/Gender
FEMALE
Age
18 Years to 35 Years
Healthy volunteers
Yes
Inclusion criteria
* healthy young female (18-35 years) * non smoking * English or French speaking * ability to provide informed consent
Exclusion criteria
* claustrophobia * engaged in endurance training * acute or chronic illness * sedentary (not engaged in any form of physical activity) * physical restriction limiting physical activity
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Evaporative heat loss at end exercise | End of the 60-min intermittent exercise bout | Evaporative heat loss as assessed using a direct air calorimeter |
| Dry heat loss at end exercise | End of the 60-min intermittent exercise bout | Dry heat loss as assessed using a direct air calorimeter |
| Total heat loss at end exercise | End of the 60-min intermittent exercise bout | Total heat loss as assessed using a direct air calorimeter |
| Body heat storage | End of the 60-min intermittent exercise bout | Heat stored in the body for each of the exercise bouts |
| Change in body heat content | End of the 60-min intermittent exercise bout | Body heat content measured at the end of intermittent exercise |
| Core temperature | End of the 60-min intermittent exercise bout | Rectal temperature during final 5 minutes of each of the exercise bouts |
| Mean skin temperature | 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 | End of the 60-min intermittent exercise bout | Relative increase in core temperature for each 30-minute exercise bout |
| Relative change in mean skin temperature at end exercise | End of the 60-min intermittent exercise bout | Relative change in mean skin temperature for each 30-minute exercise bout |
| Heart rate | End of the 60-min intermittent exercise bout | Heart rate during final 5 minutes of each of the exercise bouts |
| Rating of perceived exertion | 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 | 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 | 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 | 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) |
Countries
Canada
Contacts
CONTACTGlen P Kenny, PhD
PRINCIPAL_INVESTIGATORGlen P Kenny, PhD
University of Ottawa
Outcome results
None listed