Exercise in Air Pollution and Lung Health in Asthmatics
The Effects of Inhaled Beta-2-Agonists and Air Pollution on Lung Function and Athletic Capacity
Visão geral do estudo
Status
Status
Condições
Condições
Intervenção / Tratamento
Intervenção / Tratamento
Tipo de estudo
Tipo de estudo
Inscrição (Antecipado)
Inscrição
Estágio
Estágio
- Não aplicável
Contactos e Locais
Locais de estudo
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British Columbia
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Vancouver, British Columbia, Canadá, V6T 1Z1
- University of British Columbia, Environmental Physiology Laboratory
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Critérios de participação
Critérios de elegibilidade
Critérios de elegibilidade
Idades elegíveis para estudo
Aceita Voluntários Saudáveis
Gêneros Elegíveis para o Estudo
Descrição
Inclusion Criteria:
- mild-moderate asthmatics with controlled treatment (definition of "mild": percent fall index at eucapnic voluntary hyperpnea (EVH) test on screening day between 10-15%; "moderate": percent fall index at EVH test on screening day between 15 - 20%).
- men and non-pregnant women
Exclusion Criteria:
- any history of uncontrolled respiratory or cardiac disease
- pregnancy
- allergic reactions to lidocaine and salbutamol
- any recent infections or orthopaedic nasal issues/injuries that may interfere with the insertion of the catheter needed to assess expiratory flow limitation or work of breathing
- claustrophobia in small rooms, comparable to the air pollution chamber used for this study.
- English as a second language (ESL) - participants who are not able to understand the risk that may be associated with the participation in this study due to language difficulties after following the University of British Clinical Research Ethics Board Guidance Notes 13.2.1. (ESL participants will be given a consent form in the most appropriate language or an appropriate translator will be present during the initial consent process).
Plano de estudo
Como o estudo é projetado?
Detalhes do projeto
- Finalidade Principal: Ciência básica
- Alocação: Randomizado
- Modelo Intervencional: Atribuição cruzada
- Mascaramento: Triplo
Número de braços
Armas e Intervenções
Grupo de Participantes / BraçoGrupo de Participantes / Braço |
Intervenção / TratamentoIntervenção / Tratamento |
|---|---|
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Comparador Ativo: Resting in diesel exhaust following salbutamol inhalation
Participants will be sitting in an air pollution chamber while being exposed to diesel exhaust (PM2.5 of 300 μg/m3) for a total of 1hour following the inhalation of 400ug of salbutamol.
|
Study participants will sit on a chair for 60min.
This is to simulate physical resting condition.
Study participants will be exposed to 400ug of salbutamol prior to entering the air pollution chamber.
Participants will be exposed to PM2.5 of 300 μg/m3
|
|
Comparador de Placebo: Resting in diesel exhaust following placebo inhalation
Participants will be sitting in an air pollution chamber while being exposed to diesel exhaust (PM2.5 of 300 μg/m3) for a total of 1hour following the inhalation of a placebo.
|
Study participants will sit on a chair for 60min.
This is to simulate physical resting condition.
Participants will be exposed to PM2.5 of 300 μg/m3
Study participants will inhale a placebo (placebo for salbutamol) prior to entering the air pollution chamber
|
|
Comparador Ativo: Cycling in diesel exhaust following salbutamol inhalation
Participants will be cycling while being exposed to diesel exhaust (PM2.5 of 300 μg/m3) for a total of 1 hr following the inhalation of 400ug of salbutamol.
|
Study participants will be exposed to 400ug of salbutamol prior to entering the air pollution chamber.
Participants will be exposed to PM2.5 of 300 μg/m3
Study participants will exercise on a cycle ergometer for 45min.
Participants will start their 30-min long constant workload exercise test test 60-min after the drug intervention.
The exercise test will be set to a resistance of 50% of the maximal wattage that was reached on the graded exercise test on the screening day.
The cycling exercise intervention will follow the rest-intervention.
|
|
Comparador de Placebo: Cycling in diesel exhaust following placebo inhalation
Participants will be cycling while being exposed to diesel exhaust (PM2.5 of 300 μg/m3) for a total of 1 hr following the inhalation of a placebo
|
Participants will be exposed to PM2.5 of 300 μg/m3
Study participants will inhale a placebo (placebo for salbutamol) prior to entering the air pollution chamber
Study participants will exercise on a cycle ergometer for 45min.
Participants will start their 30-min long constant workload exercise test test 60-min after the drug intervention.
The exercise test will be set to a resistance of 50% of the maximal wattage that was reached on the graded exercise test on the screening day.
The cycling exercise intervention will follow the rest-intervention.
|
|
Comparador Falso: Resting in filtered air following salbutamol inhalation
Participants will be sitting while being exposed to filtered air for a total of 1hour following the inhalation of 400ug of salbutamol.
|
Study participants will sit on a chair for 60min.
This is to simulate physical resting condition.
Participants will be breathing filtered air
|
|
Comparador de Placebo: Resting in filtered air following placebo inhalation
Participants will be sitting while being exposed to filtered air for a total of 1hour following the inhalation of a placebo.
|
Study participants will sit on a chair for 60min.
This is to simulate physical resting condition.
Participants will be breathing filtered air
|
|
Comparador Falso: Cycling in filtered air following salbutamol inhalation
Participants will be cycling while being exposed to filtered air for a total of 1 hr following the inhalation of 400ug of salbutamol.
|
Study participants will be exposed to 400ug of salbutamol prior to entering the air pollution chamber.
Study participants will exercise on a cycle ergometer for 45min.
Participants will start their 30-min long constant workload exercise test test 60-min after the drug intervention.
The exercise test will be set to a resistance of 50% of the maximal wattage that was reached on the graded exercise test on the screening day.
The cycling exercise intervention will follow the rest-intervention.
Participants will be breathing filtered air
|
|
Comparador de Placebo: Cycling in filtered air following placebo inhalation
Participants will be cycling while being exposed to filtered air for a total of 1 hr following the inhalation of a placebo
|
Study participants will inhale a placebo (placebo for salbutamol) prior to entering the air pollution chamber
Study participants will exercise on a cycle ergometer for 45min.
Participants will start their 30-min long constant workload exercise test test 60-min after the drug intervention.
The exercise test will be set to a resistance of 50% of the maximal wattage that was reached on the graded exercise test on the screening day.
The cycling exercise intervention will follow the rest-intervention.
Participants will be breathing filtered air
|
O que o estudo está medindo?
Medidas de resultados primários
Medidas de resultados primários
Medida de resultado |
Prazo |
|---|---|
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Change in rating of perceived exertion for breathing, dyspnea
Prazo: Difference in perceived dyspnea between salbutamol and placebo exposure as well as polluted air and filtered air. Dyspnea ratings will be collected every 2.5min for a duration of 45min during the exercise test.
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Difference in perceived dyspnea between salbutamol and placebo exposure as well as polluted air and filtered air. Dyspnea ratings will be collected every 2.5min for a duration of 45min during the exercise test.
|
Medidas de resultados secundários
Medidas de resultados secundários
Medida de resultado |
Prazo |
|---|---|
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Change in work of breathing (WOB) between filtered air and polluted air
Prazo: work of breathing will be assessed every 2.5min for a time period of 45min during the exercise bout
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work of breathing will be assessed every 2.5min for a time period of 45min during the exercise bout
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Outras medidas de resultado
Outras medidas de resultado
Medida de resultado |
Descrição da medida |
Prazo |
|---|---|---|
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Change in spirometry (FEV1 and FVC) between filtered air and polluted air
Prazo: Spirometry will be assessed at baseline and 45min after the start of the exercise bout.
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Spirometry will be assessed at baseline and 45min after the start of the exercise bout.
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Change in cognitive function
Prazo: Cognitive function will be assessed at baseline (prior to entering the air pollution chamber) and 45 min after the start of the exercise intervention.
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cognitive function will be assessed using the NIH toolbox tests and the brain derived neurotrophic factor (BDNF) blood serum measurements
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Cognitive function will be assessed at baseline (prior to entering the air pollution chamber) and 45 min after the start of the exercise intervention.
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Retinal Imaging
Prazo: The retina will be imaged at baseline (prior to entering the air pollution chamber) and 20 min after the completion of the exercise intervention.
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The blood vessels in the eye will be imaged using a camera.
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The retina will be imaged at baseline (prior to entering the air pollution chamber) and 20 min after the completion of the exercise intervention.
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Colaboradores e Investigadores
Patrocinador
Patrocinador
Colaboradores
Colaboradores
Datas de registro do estudo
Datas Principais do Estudo
Início do estudo
Início do estudo
Conclusão Primária (Real)
Conclusão Primária
Conclusão do estudo (Real)
Conclusão do estudo
Datas de inscrição no estudo
Enviado pela primeira vez
Enviado pela primeira vez
Enviado pela primeira vez que atendeu aos critérios de CQ
Enviado pela primeira vez que atendeu aos critérios de CQ
Primeira postagem (Estimativa)
Primeira postagem
Atualizações de registro de estudo
Última Atualização Postada (Real)
Última Atualização Postada
Última atualização enviada que atendeu aos critérios de controle de qualidade
Última atualização enviada que atendeu aos critérios de controle de qualidade
Última verificação
Última verificação
Mais Informações
Termos relacionados a este estudo
Palavras-chave
Termos MeSH relevantes adicionais
- Efeitos Fisiológicos das Drogas
- Agentes Adrenérgicos
- Agentes Neurotransmissores
- Mecanismos Moleculares de Ação Farmacológica
- Agentes Autônomos
- Agentes do Sistema Nervoso Periférico
- Agonistas Adrenérgicos
- Agentes broncodilatadores
- Agentes Antiasmáticos
- Agentes do Sistema Respiratório
- Agentes de Controle Reprodutivo
- Agonistas de Receptores Beta-2 Adrenérgicos
- Beta-Agonistas Adrenérgicos
- Tocolíticos
- Salbutamol
Outros números de identificação do estudo
Outros números de identificação do estudo
- H13-01079
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