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Exercise in Air Pollution and Lung Health in Asthmatics

tiistai 28. syyskuuta 2021 päivittänyt: 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.

Tutkimuksen yleiskatsaus

Opintotyyppi

Interventio

Ilmoittautuminen (Odotettu)

20

Vaihe

  • Ei sovellettavissa

Yhteystiedot ja paikat

Tässä osiossa on tutkimuksen suorittajien yhteystiedot ja tiedot siitä, missä tämä tutkimus suoritetaan.

Opiskelupaikat

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

Osallistumiskriteerit

Tutkijat etsivät ihmisiä, jotka sopivat tiettyyn kuvaukseen, jota kutsutaan kelpoisuuskriteereiksi. Joitakin esimerkkejä näistä kriteereistä ovat henkilön yleinen terveydentila tai aiemmat hoidot.

Kelpoisuusvaatimukset

Opintokelpoiset iät

19 vuotta - 40 vuotta (Aikuinen)

Hyväksyy terveitä vapaaehtoisia

Joo

Sukupuolet, jotka voivat opiskella

Kaikki

Kuvaus

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).

Opintosuunnitelma

Tässä osiossa on tietoja tutkimussuunnitelmasta, mukaan lukien kuinka tutkimus on suunniteltu ja mitä tutkimuksella mitataan.

Miten tutkimus on suunniteltu?

Suunnittelun yksityiskohdat

  • Ensisijainen käyttötarkoitus: Perustiede
  • Jako: Satunnaistettu
  • Inventiomalli: Crossover-tehtävä
  • Naamiointi: Kolminkertaistaa

Aseet ja interventiot

Osallistujaryhmä / Arm
Interventio / Hoito
Active Comparator: 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
Placebo Comparator: 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
Active Comparator: 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.
Placebo Comparator: 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.
Huijausvertailija: 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
Placebo Comparator: 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
Huijausvertailija: 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
Placebo Comparator: 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

Mitä tutkimuksessa mitataan?

Ensisijaiset tulostoimenpiteet

Tulosmittaus
Aikaikkuna
Change in rating of perceived exertion for breathing, dyspnea
Aikaikkuna: 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.

Toissijaiset tulostoimenpiteet

Tulosmittaus
Aikaikkuna
Change in work of breathing (WOB) between filtered air and polluted air
Aikaikkuna: 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

Muut tulostoimenpiteet

Tulosmittaus
Toimenpiteen kuvaus
Aikaikkuna
Change in spirometry (FEV1 and FVC) between filtered air and polluted air
Aikaikkuna: 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
Aikaikkuna: 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
Aikaikkuna: 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.

Yhteistyökumppanit ja tutkijat

Täältä löydät tähän tutkimukseen osallistuvat ihmiset ja organisaatiot.

Opintojen ennätyspäivät

Nämä päivämäärät seuraavat ClinicalTrials.gov-sivustolle lähetettyjen tutkimustietueiden ja yhteenvetojen edistymistä. National Library of Medicine (NLM) tarkistaa tutkimustiedot ja raportoidut tulokset varmistaakseen, että ne täyttävät tietyt laadunvalvontastandardit, ennen kuin ne julkaistaan ​​julkisella verkkosivustolla.

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Opintoihin ilmoittautumispäivät

Ensimmäinen lähetetty

Tiistai 16. syyskuuta 2014

Ensimmäinen toimitettu, joka täytti QC-kriteerit

Maanantai 29. syyskuuta 2014

Ensimmäinen Lähetetty (Arvio)

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Tutkimustietojen päivitykset

Viimeisin päivitys julkaistu (Todellinen)

Torstai 30. syyskuuta 2021

Viimeisin lähetetty päivitys, joka täytti QC-kriteerit

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Viimeksi vahvistettu

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Lisää tietoa

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Kliiniset tutkimukset Ilmansaaste

Kliiniset tutkimukset Rest (Sitting on chair)

3
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