Exercise Induced Asthma Clinical Trial
Official title:
Mediator Release During Exercise-induced Bronchoconstriction
NCT number | NCT03524053 |
Other study ID # | 8666 |
Secondary ID | |
Status | Recruiting |
Phase | N/A |
First received | |
Last updated | |
Start date | November 1, 2018 |
Est. completion date | March 2020 |
This study will compare the inflammatory response in induced vs inhibited exercise induced bronchoconstriction (EIB) in patients with a medical diagnosis of asthma/EIB. Urinary and plasma samples will be analysed to compare the mediator release in each condition, alongside changes in lung function.
Status | Recruiting |
Enrollment | 12 |
Est. completion date | March 2020 |
Est. primary completion date | March 2020 |
Accepts healthy volunteers | No |
Gender | All |
Age group | 18 Years to 50 Years |
Eligibility |
Inclusion Criteria: - Able to understand the study instructions - Willing and able to give informed consent - Aged 18-50yr - Physician-diagnosed asthma and/or EIB - Participants that demonstrate EIB at the screening visit (i.e., those who have a fall in FEV1 20% to 50%) will be eligible for the full study. Exclusion Criteria: - Any chronic medical condition other than asthma or EIB - Baseline FEV1 <70% predicted - Exacerbation of asthma or respiratory infection within the last 4 wk - Individuals who have varied their inhaled corticosteroid medication within the last 4 wk - History of anaphylaxis - Current smokers - Pregnancy - History of cardiovascular disease - Injury that would prevent exercise on a cycle ergometer - Medical contraindication to perform strenuous exercise - Required oral corticosteroids in the past 3 months - Any blood borne disease |
Country | Name | City | State |
---|---|---|---|
United Kingdom | Brunel University London | Uxbridge | Middlesex |
Lead Sponsor | Collaborator |
---|---|
Brunel University | Karolinska Institutet |
United Kingdom,
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Changes in the concentration of inflammatory mediator metabolites in urine | Concentration of metabolites of prostaglandin-D2, Cysteinyl-Leukotrienes, prostaglandin-E2, prostacyclin, thromboxane and isoprostanes will be expressed as pg per mmol of creatinine. | Urine sample will be collected 45 minutes and immediately prior to the exercise challenges (or controlled resting period) and at 45, 90, 135 and 180 minutes post-exercise. | |
Secondary | Changes in the concentration of inflammatory mediator metabolites in blood plasma | Concentration of tryptase and pro-inflammatory cytokines measured from blood plasma samples. | Urine sample will be collected 45 minutes and immediately prior to the exercise challenges (or controlled resting period) and at 45, 90, 135 and 180 minutes post-exercise. | |
Secondary | Forced vital capacity (FVC) manoeuvres using spirometry | Forced expiratory volume in one second (FEV1) measured in litres will be used to determine the severity of EIB from baseline to post-exercise challenge. | Spirometry will be performed 45 minutes and immediately prior to the exercise challenges (or controlled resting period) and at 45, 90, 135 and 180 minutes post-exercise. | |
Secondary | Breathing rate | Breathing rate (breaths per minute) will be recorded throughout exercise to control intensity between trials. | Continuous recording throughout 8-min exercise test using the online breath-by-breath analysis system. | |
Secondary | Heart rate | Heart rate (beats per minute) will be recorded throughout the exercise challenge test to control intensity between trials. | Continuous recording continuously throughout the 8-min exercise test using short-range radiotelemetry using a chest belt worn by the participant. | |
Secondary | Rating of breathing discomfort | Modified Borg scale (0- no discomfort, 10- severe discomfort). | Breathing discomfort severity ratings will be recorded every 2 minutes throughout the 8 min exercise test (a total of 4 measurements) | |
Secondary | Description of breathing discomfort | Descriptors from patients to describe the level of discomfort - i.e. 'my chest is tight'. | A description of breathing discomfort will be recorded every 2 minutes throughout the 8 min exercise test (a total of 4 measurements) |
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