An interventional study of Exercise-heat stress with no hijab and Exercise-heat stress with a hijab in Heat Stress and Temperature Change, Body, sponsored by University of Ottawa. Recruiting at 1 site in Canada. Open to female participants aged 18 Years to 35 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-06-16.
Sponsored by University of Ottawa · Not applicable, Interventional, and Basic science
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).
118 studies on the registry are indexed under Heat Stress Disorders; 45 are open to participants now.
This study's planned enrollment of 12 is below the median of 24 across 104 interventional studies indexed under Heat Stress Disorders.
Browse Heat Stress Disorders studies →University of Ottawa is the lead sponsor of 125 studies on the registry; 34 are open to participants now.
Counted across the registry records on this site, refreshed daily.
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Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
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You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
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.
Other: Exercise-heat stress with no 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.
Other: Exercise-heat stress with a hijab
Participants perform exercise in the heat with no hijab
Participants perform exercise in the heat with a hijab
Evaporative heat loss at end exercise
Evaporative heat loss as assessed using a direct air calorimeter
Time frame: End of the 60-min intermittent exercise bout
Dry heat loss at end exercise
Dry heat loss as assessed using a direct air calorimeter
Time frame: End of the 60-min intermittent exercise bout
Total heat loss at end exercise
Total heat loss as assessed using a direct air calorimeter
Time frame: End of the 60-min intermittent exercise bout
Body heat storage
Heat stored in the body for each of the exercise bouts
Time frame: End of the 60-min intermittent exercise bout
Change in body heat content
Body heat content measured at the end of intermittent exercise
Time frame: End of the 60-min intermittent exercise bout
Core temperature
Rectal temperature during final 5 minutes of each of the exercise bouts
Time frame: End of the 60-min intermittent exercise bout
Mean skin temperature
Mean skin temperature during final 5 minutes of each of the exercise bouts
Time frame: End of the 60-min intermittent exercise bout
Relative change in core temperature at end exercise
Relative increase in core temperature for each 30-minute exercise bout
Time frame: End of the 60-min intermittent exercise bout
Relative change in mean skin temperature at end exercise
Relative change in mean skin temperature for each 30-minute exercise bout
Time frame: End of the 60-min intermittent exercise bout
Heart rate
Heart rate during final 5 minutes of each of the exercise bouts
Time frame: End of the 60-min intermittent exercise bout
Rating of perceived exertion
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)
Time frame: End of the 60-min intermittent exercise bout
Thermal sensation A
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)
Time frame: End of the 60-min intermittent exercise bout
Thermal sensation B
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)
Time frame: End of the 60-min intermittent exercise bout
Thirst sensation
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)
Time frame: End of the 60-min intermittent exercise bout
Ran from Jun 2025 to primary completion in Oct 2025, 4 months.
Of 75 non-industry interventional studies with no phase under Heat Stress Disorders, half reached primary completion within 16 months of starting (the median), counting those still running; a quarter within 4 and three quarters within 27. This study's 4 months is below that.
Counting every sponsor, half of 75 studies reached it within 16 months; a quarter within 4 and three quarters within 27.
How these figures are worked out, and which studies are left out of them.
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