[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-study-detail:100641555":3},{"organization":4,"armGroups":7,"interventions":19,"overallOfficials":24,"centralContacts":29,"locations":36,"responsibleParty":49,"collaborators":24,"id":53,"slug":54,"hasResults":55,"nctId":56,"briefTitle":57,"officialTitle":58,"acronym":24,"eligibilityCriteria":59,"healthyVolunteers":60,"sex":61,"minAge":62,"maxAge":63,"enrollmentInfo":64,"targetDuration":24,"studyType":67,"phases":68,"briefSummary":70,"conditions":71,"keywords":78,"overallStatus":88,"whyStopped":24,"lastUpdateSubmitDate":89,"lastUpdatePostDateStruct":90,"startDateStruct":93,"completionDateStruct":95,"leadSponsor":97,"locationsCount":98},{"fullName":5,"class":6},"University of Ottawa","OTHER",[8,14],{"label":9,"type":10,"description":11,"interventionNames":12},"Recovery at recommended indoor temperature limit","EXPERIMENTAL","Participants complete a 2-day, 2-night simulated occupational heat exposure protocol consisting of daytime work in a hot environment (37.5°C, 35% RH) and overnight recovery (18:30-08:00) at the recommended upper indoor temperature limit (26°C, 45% RH).",[13],"Other: Simulated occupational heat exposure with recovery at recommended indoor temperature limit",{"label":15,"type":10,"description":16,"interventionNames":17},"Recovery in an overheated indoor environment","Participants complete a 2-day, 2-night simulated occupational heat exposure protocol consisting of daytime work in a hot environment (37.5°C, 35% RH) and overnight recovery (18:30-08:00) in an overheated indoor environment (31°C, 45% RH).",[18],"Other: Simulated occupational heat exposure with recovery in an overheated indoor environment",[20,25],{"type":6,"name":21,"description":22,"armGroupLabels":23,"otherNames":24},"Simulated occupational heat exposure with recovery at recommended indoor temperature limit","Participants complete a 2-day, 2-night simulated occupational heat exposure protocol involving daytime work in a hot environment (37.5°C, 35% RH) and overnight recovery (18:30-08:00) at the recommended upper indoor temperature limit (26°C, 45% RH).",[9],null,{"type":6,"name":26,"description":27,"armGroupLabels":28,"otherNames":24},"Simulated occupational heat exposure with recovery in an overheated indoor environment","Participants complete a 2-day, 2-night simulated occupational heat exposure protocol involving daytime work in a hot environment (37.5°C, 35% RH) and overnight recovery (18:30-08:00) in an overheated indoor environment (31°C, 45% RH).",[15],[30],{"name":31,"role":32,"phone":33,"phoneExt":34,"email":35},"Glen P Kenny, PhD","CONTACT","6135625800","4282","gkenny@uottawa.ca",[37],{"facility":5,"status":24,"city":38,"state":39,"zip":40,"country":41,"countryCode":42,"cosmosGeoPoint":43,"geoPoint":48,"contacts":24},"Ottawa","Ontario","K1N 6N5","Canada","CA",{"type":44,"coordinates":45},"Point",[46,47],-75.69812,45.41117,{"lat":47,"lon":46},{"type":50,"investigatorFullName":51,"investigatorTitle":52,"investigatorAffiliation":5,"oldNameTitle":24,"oldOrganization":24},"PRINCIPAL_INVESTIGATOR","Glen P. Kenny","Full Professor, University Research Chair","100641555","consecutive-occupational-heat-exposure-with-and-without-overnight-cooling-100641555",false,"NCT07656519","Consecutive Occupational Heat Exposure With and Without Overnight Cooling","Physiological Responses to Consecutive Days of Occupational Heat Exposure With and Without Overnight Access to Cooling","Inclusion Criteria:\n\n* Are male.\n* Do not smoke or have been smoke free for at least 5 years.\n* English or French speaking.\n* Ability to provide informed consent.\n* Are physically active (engage in exercise at least 2 times per week for ≥30 minutes)\n\nExclusion Criteria:\n\n* Are regularly exposed to hot environments (e.g., occupational heat exposure)\n* Experience claustrophobia or discomfort in enclosed environments\n* Episode(s) of severe hypoglycemia (requiring the assistance of another person) within the previous year, or inability to sense hypoglycemia (hypoglycemia unawareness).\n* Serious complications related to diabetes (gastroparesis, renal disease, uncontrolled hypertension, severe autonomic neuropathy).\n* Uncontrolled hypertension - BP \\>150 mmHg systolic or \\>95 mmHg diastolic in a sitting position.\n* Restrictions in physical activity due to disease (e.g. intermittent claudication, renal impairment, active proliferative retinopathy, unstable cardiac or pulmonary disease, disabling stroke, severe arthritis, etc.).\n* Use of or changes in medication judged by the patient or investigators to make participation in this study inadvisable.\n* Cardiac abnormalities identified during screening",true,"MALE","50 Years","70 Years",{"count":65,"type":66},10,"ESTIMATED","INTERVENTIONAL",[69],"NA","Extreme heat events are becoming more frequent, intense, and prolonged, increasing the risk of heat-related illness among workers exposed to hot environments. Current occupational heat-stress guidelines are designed to limit excessive increases in core body temperature and physiological strain during work in the heat through the use of work-rest schedules. However, these guidelines are largely based on single-day heat exposures and assume that workers recover in cool indoor environments between shifts. During heat events, many workers may instead recover in homes or accommodations that remain overheated, particularly in the absence of air conditioning. Inadequate overnight cooling may impair the body's ability to dissipate heat, increase physiological strain, and reduce tolerance to heat exposure on subsequent workdays. Older adults may be especially vulnerable due to age-related impairments in heat-loss capacity. To date, the effects of recovering in an overheated indoor environment on physiological strain and thermoregulatory function during repeated occupational heat exposure remain poorly understood, limiting the development of evidence-based recommendations to protect workers during prolonged heat events.\n\nThe primary objective of this study is to determine whether overnight recovery in an overheated indoor environment increases physiological strain during repeated occupational heat exposure in older adults. Specifically, investigators will assess whether recovery at the recently proposed upper indoor temperature limit of 26°C and 45% relative humidity (RH) (PMID: 38329752) is sufficient to attenuate elevations in core temperature during subsequent work in the heat compared with recovery in an overheated indoor environment (31°C, 45% RH) representative of conditions commonly experienced during extreme heat events. Healthy older adults will complete two consecutive days and nights of simulated moderate-intensity occupational heat exposure, with overnight recovery occurring in either the 26°C or 31°C condition. Measures of core temperature, cardiovascular strain, heat-loss capacity, hydration status, sleep quality, cognitive function, mood, and perceptual responses will be assessed to determine the impact of overnight recovery conditions on responses to repeated heat exposure. Whole-body heat-loss capacity will also be evaluated before and after the exposure protocol as assessed during incremental, intermittent exercise protocol performed in an air calorimeter.",[72,73,74,75,76,77],"Body Temperature Changes","Heat Stress","Heat Exposure","Heat Fatigue","Work Related Stress","Physiological Stress",[79,80,81,82,83,84,85,86,87],"Heat Strain","Thermoregulation","Exercise","Core temperature","Occupational heat stress","Aging","Heat wave","Sleep","Hyperthermia","NOT_YET_RECRUITING","2026-06-14",{"date":91,"type":92},"2026-06-18","ACTUAL",{"date":94,"type":66},"2026-07-01",{"date":96,"type":66},"2027-08-31",{"name":5,"class":6},1]