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Exercise in Air Pollution and Lung Health in Asthmatics

28. září 2021 aktualizováno: 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.

Přehled studie

Typ studie

Intervenční

Zápis (Očekávaný)

20

Fáze

  • Nelze použít

Kontakty a umístění

Tato část poskytuje kontaktní údaje pro ty, kteří studii provádějí, a informace o tom, kde se tato studie provádí.

Studijní místa

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

Kritéria účasti

Výzkumníci hledají lidi, kteří odpovídají určitému popisu, kterému se říká kritéria způsobilosti. Některé příklady těchto kritérií jsou celkový zdravotní stav osoby nebo předchozí léčba.

Kritéria způsobilosti

Věk způsobilý ke studiu

19 let až 40 let (Dospělý)

Přijímá zdravé dobrovolníky

Ano

Pohlaví způsobilá ke studiu

Všechno

Popis

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).

Studijní plán

Tato část poskytuje podrobnosti o studijním plánu, včetně toho, jak je studie navržena a co studie měří.

Jak je studie koncipována?

Detaily designu

  • Primární účel: Základní věda
  • Přidělení: Randomizované
  • Intervenční model: Crossover Assignment
  • Maskování: Trojnásobný

Zbraně a zásahy

Skupina účastníků / Arm
Intervence / Léčba
Aktivní komparátor: 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
Komparátor placeba: 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
Aktivní komparátor: 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.
Komparátor placeba: 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.
Falešný srovnávač: 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
Komparátor placeba: 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
Falešný srovnávač: 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
Komparátor placeba: 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

Co je měření studie?

Primární výstupní opatření

Měření výsledku
Časové okno
Change in rating of perceived exertion for breathing, dyspnea
Časové okno: 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.

Sekundární výstupní opatření

Měření výsledku
Časové okno
Change in work of breathing (WOB) between filtered air and polluted air
Časové okno: 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

Další výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Change in spirometry (FEV1 and FVC) between filtered air and polluted air
Časové okno: 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
Časové okno: 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
Časové okno: 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.

Spolupracovníci a vyšetřovatelé

Zde najdete lidi a organizace zapojené do této studie.

Termíny studijních záznamů

Tato data sledují průběh záznamů studie a předkládání souhrnných výsledků na ClinicalTrials.gov. Záznamy ze studií a hlášené výsledky jsou před zveřejněním na veřejné webové stránce přezkoumány Národní lékařskou knihovnou (NLM), aby se ujistily, že splňují specifické standardy kontroly kvality.

Hlavní termíny studia

Začátek studia

1. května 2015

Primární dokončení (Aktuální)

1. srpna 2016

Dokončení studie (Aktuální)

1. května 2021

Termíny zápisu do studia

První předloženo

16. září 2014

První předloženo, které splnilo kritéria kontroly kvality

29. září 2014

První zveřejněno (Odhad)

30. září 2014

Aktualizace studijních záznamů

Poslední zveřejněná aktualizace (Aktuální)

30. září 2021

Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality

28. září 2021

Naposledy ověřeno

1. září 2021

Více informací

Tyto informace byly beze změn načteny přímo z webu clinicaltrials.gov. Máte-li jakékoli požadavky na změnu, odstranění nebo aktualizaci podrobností studie, kontaktujte prosím register@clinicaltrials.gov. Jakmile bude změna implementována na clinicaltrials.gov, bude automaticky aktualizována i na našem webu .

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