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Exercise in Air Pollution and Lung Health in Asthmatics

28. september 2021 opdateret af: 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.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Undersøgelsestype

Interventionel

Tilmelding (Forventet)

20

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

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

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

19 år til 40 år (Voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Beskrivelse

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).

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Grundvidenskab
  • Tildeling: Randomiseret
  • Interventionel model: Crossover opgave
  • Maskning: Tredobbelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Aktiv komparator: 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.
Andet: Rest (Sitting on chair)
Study participants will sit on a chair for 60min. This is to simulate physical resting condition.
Medicin: Salbutamol inhalation
Study participants will be exposed to 400ug of salbutamol prior to entering the air pollution chamber.
Andet: Diesel Exhaust Exposure
Participants will be exposed to PM2.5 of 300 μg/m3
Placebo komparator: 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.
Andet: Rest (Sitting on chair)
Study participants will sit on a chair for 60min. This is to simulate physical resting condition.
Andet: Diesel Exhaust Exposure
Participants will be exposed to PM2.5 of 300 μg/m3
Medicin: Placebo inhalation
Study participants will inhale a placebo (placebo for salbutamol) prior to entering the air pollution chamber
Aktiv komparator: 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.
Medicin: Salbutamol inhalation
Study participants will be exposed to 400ug of salbutamol prior to entering the air pollution chamber.
Andet: Diesel Exhaust Exposure
Participants will be exposed to PM2.5 of 300 μg/m3
Andet: Cycling exercise
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.
Placebo komparator: 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
Andet: Diesel Exhaust Exposure
Participants will be exposed to PM2.5 of 300 μg/m3
Medicin: Placebo inhalation
Study participants will inhale a placebo (placebo for salbutamol) prior to entering the air pollution chamber
Andet: Cycling exercise
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.
Sham-komparator: 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.
Andet: Rest (Sitting on chair)
Study participants will sit on a chair for 60min. This is to simulate physical resting condition.
Andet: Filtered air
Participants will be breathing filtered air
Placebo komparator: 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.
Andet: Rest (Sitting on chair)
Study participants will sit on a chair for 60min. This is to simulate physical resting condition.
Andet: Filtered air
Participants will be breathing filtered air
Sham-komparator: 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.
Medicin: Salbutamol inhalation
Study participants will be exposed to 400ug of salbutamol prior to entering the air pollution chamber.
Andet: Cycling exercise
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.
Andet: Filtered air
Participants will be breathing filtered air
Placebo komparator: 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
Medicin: Placebo inhalation
Study participants will inhale a placebo (placebo for salbutamol) prior to entering the air pollution chamber
Andet: Cycling exercise
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.
Andet: Filtered air
Participants will be breathing filtered air

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Tidsramme
Change in rating of perceived exertion for breathing, dyspnea
Tidsramme: 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.

Sekundære resultatmål

Resultatmål
Tidsramme
Change in work of breathing (WOB) between filtered air and polluted air
Tidsramme: 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

Andre resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Change in spirometry (FEV1 and FVC) between filtered air and polluted air
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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.

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

University of British Columbia

Samarbejdspartnere

Natural Sciences and Engineering Research Council, Canada
Canadian Academy of Sport and Exercise Medicine (CASEM)
Fraser Basin Council

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart

1. maj 2015

Primær færdiggørelse (Faktiske)

1. august 2016

Studieafslutning (Faktiske)

1. maj 2021

Datoer for studieregistrering

Først indsendt

16. september 2014

Først indsendt, der opfyldte QC-kriterier

29. september 2014

Først opslået (Skøn)

30. september 2014

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

30. september 2021

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

28. september 2021

Sidst verificeret

1. september 2021

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • H13-01079

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

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Betingelser

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Placeringer

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