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Exercise in Air Pollution and Lung Health in Asthmatics

28 сентября 2021 г. обновлено: Michael Koehle, University of British Columbia

The Effects of Inhaled Beta-2-Agonists and Air Pollution on Lung Function and Athletic Capacity

When exposed to air pollution, the asthma symptoms are aggravated and lung function is impaired. Due to high breathing rates and volumes, physically active individuals are at particular risk of lung health impairment due to the high breathing rates and volumes. Greater doses of air pollutants reach deeper areas in the lungs where they can trigger asthma-symptoms. When treating these symptoms with inhaled beta-2-agonists the airways widen even more, allowing the air pollutants to reach even deeper areas of the lung. With this study the investigators investigate how inhaled beta-2-agonists affect athletic capacity and lung health in physically active asthmatics.

Обзор исследования

Тип исследования

Интервенционный

Регистрация (Ожидаемый)

20

Фаза

  • Непригодный

Контакты и местонахождение

В этом разделе приведены контактные данные лиц, проводящих исследование, и информация о том, где проводится это исследование.

Места учебы

    • British Columbia
      • Vancouver, British Columbia, Канада, V6T 1Z1
        • University of British Columbia, Environmental Physiology Laboratory

Критерии участия

Исследователи ищут людей, которые соответствуют определенному описанию, называемому критериям приемлемости. Некоторыми примерами этих критериев являются общее состояние здоровья человека или предшествующее лечение.

Критерии приемлемости

Возраст, подходящий для обучения

От 19 лет до 40 лет (Взрослый)

Принимает здоровых добровольцев

Да

Полы, имеющие право на обучение

Все

Описание

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).

Учебный план

В этом разделе представлена ​​подробная информация о плане исследования, в том числе о том, как планируется исследование и что оно измеряет.

Как устроено исследование?

Детали дизайна

  • Основная цель: Фундаментальная наука
  • Распределение: Рандомизированный
  • Интервенционная модель: Назначение кроссовера
  • Маскировка: Тройной

Оружие и интервенции

Группа участников / Армия
Вмешательство/лечение
Активный компаратор: 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
Плацебо Компаратор: 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
Активный компаратор: 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.
Плацебо Компаратор: 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.
Фальшивый компаратор: 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
Плацебо Компаратор: 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
Фальшивый компаратор: 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
Плацебо Компаратор: 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

Что измеряет исследование?

Первичные показатели результатов

Мера результата
Временное ограничение
Change in rating of perceived exertion for breathing, dyspnea
Временное ограничение: 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.
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.

Вторичные показатели результатов

Мера результата
Временное ограничение
Change in work of breathing (WOB) between filtered air and polluted air
Временное ограничение: work of breathing will be assessed every 2.5min for a time period of 45min during the exercise bout
work of breathing will be assessed every 2.5min for a time period of 45min during the exercise bout

Другие показатели результатов

Мера результата
Мера Описание
Временное ограничение
Change in spirometry (FEV1 and FVC) between filtered air and polluted air
Временное ограничение: Spirometry will be assessed at baseline and 45min after the start of the exercise bout.
Spirometry will be assessed at baseline and 45min after the start of the exercise bout.
Change in cognitive function
Временное ограничение: Cognitive function will be assessed at baseline (prior to entering the air pollution chamber) and 45 min after the start of the exercise intervention.
cognitive function will be assessed using the NIH toolbox tests and the brain derived neurotrophic factor (BDNF) blood serum measurements
Cognitive function will be assessed at baseline (prior to entering the air pollution chamber) and 45 min after the start of the exercise intervention.
Retinal Imaging
Временное ограничение: The retina will be imaged at baseline (prior to entering the air pollution chamber) and 20 min after the completion of the exercise intervention.
The blood vessels in the eye will be imaged using a camera.
The retina will be imaged at baseline (prior to entering the air pollution chamber) and 20 min after the completion of the exercise intervention.

Соавторы и исследователи

Здесь вы найдете людей и организации, участвующие в этом исследовании.

Даты записи исследования

Эти даты отслеживают ход отправки отчетов об исследованиях и сводных результатов на сайт ClinicalTrials.gov. Записи исследований и сообщаемые результаты проверяются Национальной медицинской библиотекой (NLM), чтобы убедиться, что они соответствуют определенным стандартам контроля качества, прежде чем публиковать их на общедоступном веб-сайте.

Изучение основных дат

Начало исследования

1 мая 2015 г.

Первичное завершение (Действительный)

1 августа 2016 г.

Завершение исследования (Действительный)

1 мая 2021 г.

Даты регистрации исследования

Первый отправленный

16 сентября 2014 г.

Впервые представлено, что соответствует критериям контроля качества

29 сентября 2014 г.

Первый опубликованный (Оценивать)

30 сентября 2014 г.

Обновления учебных записей

Последнее опубликованное обновление (Действительный)

30 сентября 2021 г.

Последнее отправленное обновление, отвечающее критериям контроля качества

28 сентября 2021 г.

Последняя проверка

1 сентября 2021 г.

Дополнительная информация

Эта информация была получена непосредственно с веб-сайта clinicaltrials.gov без каких-либо изменений. Если у вас есть запросы на изменение, удаление или обновление сведений об исследовании, обращайтесь по адресу register@clinicaltrials.gov. Как только изменение будет реализовано на clinicaltrials.gov, оно будет автоматически обновлено и на нашем веб-сайте. .

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