Acute Effect of Salbutamol on Heart Rate and Blood Pressure During Exercise in Patients With Moderate or Severe Asthma and Healthy Subjects

Study Overview
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Brief Summary
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Contextualization: Exercise is a common triggers of bronchospasm in patients with asthma and healthy subjects. To prevent these symptoms frequently they have to use Short-Acting Beta2-Agonists. However, the cardiovascular effects of salbutamol during and after exercise remain poorly known. Objective: To evaluate the effect of salbutamol on heart rate and blood pressure during exercise in patients with moderate or severe asthma and healthy individuals. Methods: A randomized, double-blind, crossover study will be conducted which 13 individuals with moderate or severe persistent asthma and 13 healthy individuals aged between 20 to 59 years. Patients will perform a maximal effort test on 2 nonconsecutive days, with either 400mcg Salbutamol or 4 placebo puffs. The order of use of placebo or salbutamol will be drawn. During the protocol, heart rate, blood pressure, perception of exertion and peak expiratory flow will be monitored.

Official Title
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Acute Effect of Salbutamol on Heart Rate and Blood Pressure During Exercise in Patients With Moderate or Severe Asthma and Healthy Subjects: Randomized, Double-blind, and Crossover Study

Conditions
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Asthma, Heart Rate Fast

Intervention / Treatment
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* Drug: salbutamol
* Drug: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria for asthmatics: Have the diagnosis of moderate or severe asthma according to the clinical criteria described in the literature Be between 20 and 59 years of age Being from the Asthma Assistance and Research Center (NAPA) of University of São Paulo Faculty of Medicine Clinics Hospital Have treatment at the outpatient clinic for at least 3 months, Have a stable clinical condition for at least 30 days Make use of the optimized medicine daily Read and signed the TCLE approved by the Ethics and Research Committee of the Ibirapuera University (UNIB) under opinion nº 1,574,833 Exclusion Criteria for asthmatics: Individuals diagnosed with another lung disease, Have psychiatric, musculoskeletal or cardiovascular diseases, Being smokers Being pregnant Practice regular physical activity. Criterion for inclusion of healthy individuals Be between 20 and 59 years of age Healthy individuals Both genders Age between 20 and 59 years Read and signed the TCLE approved by the Ethics and Research Committee of the Ibirapuera University (UNIB) under opinion nº 1,574,833 Criteria for the exclusion of healthy individuals Pregnant women Smokers Psychic diseases Osteomuscular diseases Practitioners of regular exercise Physical Activity Readiness Questionnaire (PAR-Q)

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 59 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Crossover Assignment
Interventional Model Description: Randomized Clinical trial, controlled, double-blind and crossover
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Salbutamol<br>Salbutamol is a bronchodilator that relaxes the muscles of the airways and increases the flow of air to the lungs. With the aid of a spacer, 400mcg of the drug will be administered once during the protocol. | Drug: salbutamol<br>* Salbutamol or albuterol is a short-acting β2 adrenergic receptor agonist used for the relief of bronchospasm in conditions such as asthma and chronic obstructive pulmonary disease.<br>* Other names: Albuterol;|
| Placebo Comparator: Placebo<br>Inoculant treatment through a substance that does not have an inherent power to produce an effect that is desired or expected. Four placebo puffs will be offered through a device similar to the salbutamol intervention device. | Drug: Placebo<br>* Neutral preparation for pharmacological effects, given in substitution of a medicine, for the purpose of provoking or controlling reactions, ger. Of a psychological nature, accompanying such a therapeutic procedure.<br>* Other names: Falso;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Heart rate | It is being considered that the asthmatic heart rate will increase after the use of salbutamol and that the increase will remain during and after the exercise, in relation to the placebo intervention. To evaluate this variable, the Polar RS800cx heart rate monitor will be used, where the participant will have his heart beats monitored beat to beat until the end of the protocol. | Baseline up to 1 hour and after 1 week. | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Blood pressure | It is being considered that the systemic arterial pressure (SBP) of the asthmatic will not have significant alteration after the use of salbutamol during and after the exercise. To evaluate this variable, a Solidor manual sphygmomanometer and a supermed stethoscope will be used. The SBP will be measured after 10 minutes of initial rest, 15 minutes after administration of the drug, every 3 minutes during the physical test and every 5 minutes for 20 minutes at rest. | Baseline and for 1 hour and after 1 week again. | 
| Peak flow | Due to improved airflow brought by the drug, the peak expiratory flow is expected to increase with the use of salbutamol. | Baseline, 15 minutes final and after 1 week. | 
| Subjective perception of Borg | The modified borg subjective perception scale will be used, where the perception of effort will be reported by a scale ranging from 0 to 10. The scale will be applied during the stress test every 3 minutes and during the final rest phase. | 1 hour and after 1 week . | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Asthma, Salbutamol, Exercise, Heart Rate, Blood pressure