[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-studies-list:{\"conditionNormalized\":\"heat-fatigue\",\"overallStatus\":[\"RECRUITING\",\"AVAILABLE\",\"NOT_YET_RECRUITING\"],\"orderBy\":\"LastUpdateSubmitDate:desc\",\"size\":25,\"offset\":0}":3,"health-study-condition:heat-fatigue":30},{"pageToken":4,"total":5,"offset":6,"count":5,"results":7},null,2,0,[8,56],{"id":9,"slug":10,"hasResults":11,"nctId":12,"briefTitle":13,"officialTitle":14,"acronym":4,"eligibilityCriteria":15,"healthyVolunteers":11,"sex":16,"minAge":17,"maxAge":18,"enrollmentInfo":19,"targetDuration":4,"studyType":22,"phases":23,"briefSummary":25,"conditions":26,"keywords":34,"overallStatus":44,"whyStopped":4,"lastUpdateSubmitDate":45,"lastUpdatePostDateStruct":46,"startDateStruct":49,"completionDateStruct":50,"leadSponsor":52,"locationsCount":55},"100644136","working-in-the-heat-at-simulated-altitude-effects-of-normobaric-hypoxia-on-physiological-strain-100644136",false,"NCT07664462","Working in the Heat at Simulated Altitude: Effects of Normobaric Hypoxia on Physiological Strain","Effects of Normobaric Hypoxia on Initial Stay Time and Physiological Strain During Moderate-Intensity Work in the Heat in Young and Older Males","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* Are regularly exposed to hypoxic environments (e.g., high altitudes)\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","MALE","18 Years","70 Years",{"count":20,"type":21},20,"ESTIMATED","INTERVENTIONAL",[24],"NA","Extreme heat events are becoming more frequent, intense, and prolonged, increasing the risk of heat-related illness among workers performing physically demanding work in hot environments. Current occupational heat-stress guidelines aim to limit excessive increases in core body temperature and physiological strain through the use of work-rest schedules. However, these guidelines do not provide clear direction on the safe, maximum duration of continuous work that can be performed before heat-mitigation controls should be implemented, known as the initial stay time. Recent work has generated initial stay time recommendations for young and older workers performing moderate-intensity work in the heat, but these estimates were developed under normoxic conditions. In many occupational settings, workers may be exposed to additional environmental stressors such as hypoxia, including work at altitude or in oxygen-reduced environments. Hypoxia can increase cardiovascular strain, reduce arterial oxygen saturation, and alter exercise tolerance, potentially compromising the effectiveness of heat-stress guidance developed under normal oxygen conditions. Older workers may be especially vulnerable due to age-related reductions in thermoregulatory and cardiovascular function. To date, it remains unclear whether hypoxia alters physiological strain during work in the heat or whether current initial stay time and recovery recommendations remain protective under combined heat and hypoxic stress.\n\nThe primary objective of this study is to determine whether exposure to hypoxia increases physiological strain during moderate-intensity work in the heat in young and older males. Specifically, investigators will assess whether normoxia-derived initial stay times and recovery recommendations for work at 29°C wet-bulb globe (37.5°C, 35% RH) temperature remain effective when workers are exposed to hypoxia equivalent to 14% inspired oxygen (simulating \\~3000 m in altitude). Healthy young and older males will complete simulated occupational heat exposure under two conditions: heat alone and combined heat plus hypoxia. Participants will perform moderate-intensity treadmill work based on age-specific initial stay times, followed by prescribed work-rest cycles and seated recovery. Measures of core temperature, cardiovascular strain, oxygen saturation, skin temperature, hydration status, perceptual responses, mood, symptoms of environmental stress, and cognitive function will be assessed to determine whether hypoxia modifies responses to work in the heat. This study will provide important evidence on whether occupational heat-stress guidance requires refinement when workers are exposed to combined heat and hypoxic stress.",[27,28,29,30,31,32,33],"Body Temperature Changes","Heat Stress","Heat Exposure","Heat Fatigue","Hypoxia, Altitude","Work Related Stress","Physiological Stress",[35,36,37,38,39,40,41,42,43],"Heat Strain","Thermoregulation","Exercise","Simulated altitude","Core temperature","Occupational Heat Stress","Aging","Hypoxia","Hyperthermia","RECRUITING","2026-06-17",{"date":47,"type":48},"2026-06-24","ACTUAL",{"date":45,"type":21},{"date":51,"type":21},"2027-02-28",{"name":53,"class":54},"University of Ottawa","OTHER",1,{"id":57,"slug":58,"hasResults":11,"nctId":59,"briefTitle":60,"officialTitle":61,"acronym":4,"eligibilityCriteria":62,"healthyVolunteers":63,"sex":16,"minAge":64,"maxAge":18,"enrollmentInfo":65,"targetDuration":4,"studyType":22,"phases":67,"briefSummary":68,"conditions":69,"keywords":70,"overallStatus":74,"whyStopped":4,"lastUpdateSubmitDate":75,"lastUpdatePostDateStruct":76,"startDateStruct":78,"completionDateStruct":80,"leadSponsor":82,"locationsCount":55},"100641555","consecutive-occupational-heat-exposure-with-and-without-overnight-cooling-100641555","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,"50 Years",{"count":66,"type":21},10,[24],"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.",[27,28,29,30,32,33],[35,36,37,39,71,41,72,73,43],"Occupational heat stress","Heat wave","Sleep","NOT_YET_RECRUITING","2026-06-14",{"date":77,"type":48},"2026-06-18",{"date":79,"type":21},"2026-07-01",{"date":81,"type":21},"2027-08-31",{"name":53,"class":54}]