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Impacto do Sobreaquecimento Interior na Tensão Fisiológica em Crianças

9 de novembro de 2026 atualizado por: Glen P. Kenny, University of Ottawa

Um Estudo Preliminar Avaliando a Eficácia de um Limite de Temperatura Interior de 26 °C nas Respostas Fisiológicas em Crianças

Communities worldwide are experiencing increasing heat extremes that challenge the limits of human thermoregulation, particularly among vulnerable populations such as children. Compared with adults, children are more susceptible to heat related illness due to less efficient thermoregulatory systems and difficulty recognizing early signs of heat stress. In addition, prolonged heat exposure can adversely affect their mental health, contributing to cognitive decline, heightened anxiety, and irritability. As children spend substantial time in hot environments at school and at home, and as these conditions intensify with climate change, actions to safeguard their health are essential. Yet our understanding of heat exposure effects in children remains incomplete, hindering the development of evidence based strategies to protect them.

To address this gap, the investigators aim to evaluate whether an indoor temperature limit of 26 °C (45 percent relative humidity), the upper threshold recommended to protect older adults, can effectively prevent dangerous increases in physiological strain and declines in cognitive function in children during a simulated daylong heatwave. The preliminary study will assess physiological and cognitive responses in children aged 10 to 15 years and adults aged 20 to 30 years during a 6 hour exposure (approximating a typical school day) to two conditions: (1) the recommended indoor temperature upper limit (26 °C) and (2) a high heat condition representative of homes and schools without air conditioning during extreme heat events (36 °C). In both conditions, children will remain seated at rest while wearing light clothing (t shirt and shorts), with the exception of performing 15 minutes of stepping exercise (6-6.5 METS) each hour (excluding the lunch period) to reflect typical daily activity in a school setting. This experimental design will allow investigators to determine whether maintaining indoor temperatures at the recommended upper limit for older adults sufficiently mitigates physiological strain in children.

Visão geral do estudo

Status

Ativo, não recrutando

Condições

Intervenção / Tratamento

Tipo de estudo

Intervencional

Inscrição (Estimado)

10

Estágio

  • Não aplicável

Contactos e Locais

Esta seção fornece os detalhes de contato para aqueles que conduzem o estudo e informações sobre onde este estudo está sendo realizado.

Locais de estudo

    • Ontario
      • Ottawa, Ontario, Canadá, K1N 6N5
        • University of Ottawa

Critérios de participação

Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.

Critérios de elegibilidade

Idades elegíveis para estudo

10 anos a 30 anos (Filho, Adulto)

Aceita Voluntários Saudáveis

Sim

Gêneros Elegíveis para o Estudo

Tudo

Descrição

Inclusion Criteria:

  • English or French speaking.
  • Ability to provide informed assent.
  • Children aged 10-15 years and adults aged 20-30 years.

Exclusion Criteria:

  • Chronic health conditions
  • Endurance exercise training (greater than 3 sessions of vigorous exercise training per week for 30 minutes or more)
  • Restrictions to physical activity

Plano de estudo

Esta seção fornece detalhes do plano de estudo, incluindo como o estudo é projetado e o que o estudo está medindo.

Como o estudo é projetado?

Detalhes do projeto

  • Finalidade Principal: Ciência básica
  • Alocação: Randomizado
  • Modelo Intervencional: Atribuição cruzada
  • Mascaramento: Solteiro

Armas e Intervenções

Grupo de Participantes / Braço
Intervenção / Tratamento
Experimental: Exposure to indoor temperature upper limit of 26°C

Participants exposed daylong (6 hours) to an indoor temperature maintained at 26°C and 45% relative humidity (humidex equivalent of 29).

Children exposed to a 6-hour simulated heat exposure

Experimental: Exposure to hot indoor environment of 36°C

Participants exposed daylong (6 hours) to an indoor temperature maintained at 36°C and 45% relative humidity (humidex equivalent of 45).

Children exposed to a 6-hour simulated heat exposure

O que o estudo está medindo?

Medidas de resultados primários

Medida de resultado
Descrição da medida
Prazo
Core temperature (Peak) during daylong exposure to indoor overheating
Prazo: End of 6 hour daylong exposure

Peak visceral temperature (15 min average) during exposure. Visceral temperature is measured continuously throughout the 6 hour exposure to the simulated indoor overheating. A 0.2°C between-group difference will be considered the smallest physiologically meaningful effect.

End of 6 hour daylong exposure

Medidas de resultados secundários

Medida de resultado
Descrição da medida
Prazo
Fluid loss during daylong exposure to indoor overheating
Prazo: At end of 6 hour daylong exposure

Fluid loss calculated as the change in body mass during each exposure presented as a percentage of baseline body mass (corrected for food consumption).

At end of 6 hour daylong exposure
Fluid consumption during daylong exposure to indoor overheating
Prazo: At end of 6 hour daylong exposure

Average hourly fluid consumption calculated by weighing participant water intake at the start and end of each hour of exposure (normalized to the exposure duration).

At end of 6 hour daylong exposure
Hydration status during daylong exposure to indoor overheating
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

Hydration status measured via assessing the urine specific gravity of a urine sample.

At the start (hour 0) and end of 6 hour daylong exposure
Executive function during daylong exposure to indoor overheating (cognitive function).
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

Participants will be provided with a tablet device with the Sway Medical testing platform for the assessment of executive function. Participants will complete the Cued Stroop test, in which they are presented a sequence of congruent, neutral and incongruent color-word tasks.

At the start (hour 0) and end of 6 hour daylong exposure
CDC 4-Stage Balance Test during daylong exposure to indoor overheating (postural stability).
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

To assess postural stability, participants hold a tablet to their chest, then auditory cues guide participants through four consecutive stances, feet side by side, instep of one foot touching the big toe of the other foot, tandem stand with one foot in front of the other, heel touching toe, and stand on one foot. The balance assessment will be evaluated based on movement detected by an accelerometer integrated into the hardware of the tablet device (Sway Medical Inc).

At the start (hour 0) and end of 6 hour daylong exposure
Memory recall during daylong exposure to indoor overheating (cognitive function).
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

Participants will be provided with a tablet device with the Sway Medical testing platform for the assessment of memory recall. Participants complete both a delayed recall test and a working memory test.

At the start (hour 0) and end of 6 hour daylong exposure
Impulse control during daylong exposure to indoor overheating (cognitive function).
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

Participants will be provided with a tablet device with the Sway Medical testing platform for the assessment of impulse control. Participants will be asked to respond to both "go" and "no-go" visual cues. In response to the "go" cue, participants will initiate a movement of the device.

At the start (hour 0) and end of 6 hour daylong exposure
Reaction time during daylong exposure to indoor overheating (cognitive function).
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

Participants will be provided with a tablet device with the Sway Medical testing platform for the assessment of reaction time. Participants will be asked to initiate a movement of the device in response to a visual cue.

At the start (hour 0) and end of 6 hour daylong exposure
Diastolic blood pressure during daylong exposure to indoor overheating.
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

Diastolic blood pressure measured in triplicate via automated oscillometry (~60 seconds between measures).

At the start (hour 0) and end of 6 hour daylong exposure
Systolic blood pressure during daylong exposure to indoor overheating
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

Systolic blood pressure measured in triplicate via automated oscillometry (~60 seconds between measures).

At the start (hour 0) and end of 6 hour daylong exposure
Heart rate end of daylong exposure to indoor overheating
Prazo: End of 6 hour daylong exposure

Heart rate measured at hour 6 of exposure to indoor overheating (15-min average).

End of 6 hour daylong exposure
Heart rate (AUC) during daylong exposure to indoor overheating
Prazo: End of 6 hour daylong exposure

Areas under the curve (AUC) of heart rate during the 6 hour exposure to the simulate indoor overheating.

End of 6 hour daylong exposure
Heat rate (Peak) during daylong exposure to indoor overheating
Prazo: End of 6 hour daylong exposure

Peak heart rate (15 min average) during exposure. Heart rate is measured continuously throughout the 6 hour exposure to the simulated indoor overheating.

End of 6 hour daylong exposure
Mean skin temperature end of daylong exposure to indoor overheating
Prazo: End of 6 hour daylong exposure

Mean skin temperature measured over 7 body regions at hour 6 of exposure to indoor overheating (15-min average).

End of 6 hour daylong exposure
Mean skin temperature (AUC) during daylong exposure to indoor overheating
Prazo: End of 6 hour daylong exposure

Areas under the curve (AUC) of mean skin temperature as calculated over 7 body regions during the 6 hour exposure to the simulate indoor overheating.

End of 6 hour daylong exposure
Mean skin temperature (Peak) during daylong exposure to indoor overheating
Prazo: End of 6 hour daylong exposure

Peak mean skin temperature (15 min average) during exposure. Mean skin temperature as calculated from skin temperature measured across 7 body regions is measured continuously throughout the 6 hour exposure to the simulated indoor overheating.

End of 6 hour daylong exposure
Core temperature end of daylong exposure to indoor overheating
Prazo: End of 6 hour daylong exposure

Visceral temperature measured at hour 6 of exposure to indoor overheating (15-min average).

End of 6 hour daylong exposure
Core temperature (AUC) during daylong exposure to indoor overheating
Prazo: End of 6 hour daylong exposure

Areas under the curve (AUC) of visceral temperature during the 6 hour exposure to the simulate indoor overheating.

End of 6 hour daylong exposure
Profiles of Mood States (POMS) during daylong exposure to indoor overheating
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

Potential changes in mood (7 subscales of mood: tension, anger, depression, fatigue, confusion, vigor and esteem related affect). The POMS-40 is a validated, self-administered questionnaire that examines seven distinct aspects of mood state across two positive subscales (Esteem-Related Affect, and Vigor) and five negative subscales (Fatigue, Tension, Confusion, Anger, and Depression), which are described across 40 distinct adjectives. For each individual item, participants were asked to describe "how you feel right now" by responding using a 5-point Likert scale (0 = "Not at all", 1 = "A little", 2 = "Moderately", 3 = "Quite a lot", or 4 = "Extremely"). The values of items associated with a specific subscale (e.g., Fatigue) were summed to calculate its score.

At the start (hour 0) and end of 6 hour daylong exposure
Environmental Symptoms Questionnaire (ESQ) during daylong exposure to indoor overheating
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

Self-reported environmental reactions and medical symptomatology associated with prolonged heat exposure. The ESQ-IV is a validated 68-item, self-administered questionnaire that has been used successfully in identifying symptomatology during exposure to a wide variety of environmental conditions, including heat exposure.

Participants are asked to assess and described "how you have been feeling today" by responding to each item using a 6-point Likert scale (0 = "Not at all", 1 = "Slight", 2 = "Somewhat", 3 = "Moderate", 4 = "Quite a bit", or 5 = "Extreme"). Total Symptom Score was calculated from this data by taking the sum of the intensity ratings from all 68 individual items using reverse scores for the three positive items from the list ("I Felt Good", "I Felt Alert", and "I Felt Wide Awake").

At the start (hour 0) and end of 6 hour daylong exposure
Perceived exertion scale during daylong exposure to indoor temperature limit.
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

Perceived exertional assessed via a visual analog scale ("How hard are you working?") ranging from "no exertional at all" to "maximal exertion"

At the start (hour 0) and end of 6 hour daylong exposure
Activity levels during daylong exposure to indoor overheating
Prazo: End of 6 hour daylong exposure

Activity levels assessed via a wearable monitor (Actical) containing an accelerometer worn on the wrist and hip.

End of 6 hour daylong exposure
Feel good scale during daylong exposure to indoor overheating
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

Feel good scale assessed via a visual analog scale (How good do you feel?) ranging from "very good" to "very bad" (midpoint: neutral)

At the start (hour 0) and end of 6 hour daylong exposure
Thirst sensation scale during daylong exposure to indoor overheating
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

Thirst sensation assessed via a visual analog scale ranging from very, very thirsty to not thirsty at all.

At the start (hour 0) and end of 6 hour daylong exposure
Thermal comfort scale during daylong exposure to indoor overheating
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

Thermal comfort assessed via a visual analog scale ("How comfortable does your body temperature feel?") ranging from "very uncomfortable" to "comfortable".

At the start (hour 0) and end of 6 hour daylong exposure
Thermal sensation 2 scale during daylong exposure to indoor overheating
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

Thermal sensation assessed via a visual analog scale ("How do you feel?") ranging from "hot" to "cold"(midpoint: neutral)

At the start (hour 0) and end of 6 hour daylong exposure
Thermal sensation scale during daylong exposure to indoor overheating
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

Thermal sensation assessed via a visual analog scale (How hot do you feel?) ranging from "extremely hot" to "neutral".

At the start (hour 0) and end of 6 hour daylong exposure
BTrackS Balance Assessment during daylong exposure to indoor overheating (postural stability).
Prazo: At the start (hour 0) and end of 6 hour daylong exposure

To assess postural stability, participants will be asked to stand on a BTracks force plate with their feet spread out to shoulder width, hand on their hips and eyes closed. The assessment will comprise of four trials (one practice trial) lasting 20 seconds in length and 20 seconds between trials. Center of pressure (COP) vector data along vertical (y) and horizontal (x) axes will be summed for the total path excursion length (cm) during each trial

At the start (hour 0) and end of 6 hour daylong exposure

Colaboradores e Investigadores

É aqui que você encontrará pessoas e organizações envolvidas com este estudo.

Patrocinador

Investigadores

  • Investigador principal: Glen P Kenny, PhD, University of Ottawa

Datas de registro do estudo

Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados ​​pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.

Datas Principais do Estudo

Início do estudo (Real)

8 de novembro de 2025

Conclusão Primária (Real)

27 de abril de 2026

Conclusão do estudo (Estimado)

31 de dezembro de 2026

Datas de inscrição no estudo

Enviado pela primeira vez

21 de novembro de 2025

Enviado pela primeira vez que atendeu aos critérios de CQ

21 de novembro de 2025

Primeira postagem (Real)

3 de dezembro de 2025

Atualizações de registro de estudo

Última Atualização Postada (Real)

12 de novembro de 2026

Última atualização enviada que atendeu aos critérios de controle de qualidade

9 de novembro de 2026

Última verificação

1 de novembro de 2026

Mais Informações

Termos relacionados a este estudo

Outros números de identificação do estudo

  • HEPRU-2025-10-A

Informações sobre medicamentos e dispositivos, documentos de estudo

Estuda um medicamento regulamentado pela FDA dos EUA

Não

Estuda um produto de dispositivo regulamentado pela FDA dos EUA

Não

Essas informações foram obtidas diretamente do site clinicaltrials.gov sem nenhuma alteração. Se você tiver alguma solicitação para alterar, remover ou atualizar os detalhes do seu estudo, entre em contato com register@clinicaltrials.gov. Assim que uma alteração for implementada em clinicaltrials.gov, ela também será atualizada automaticamente em nosso site .