Use of Masks on Metabolic Parameters and Inspiratory Muscle Strength During Aerobic Exercise

Study Overview
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Brief Summary
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The purpose of this study will be to assess the effects of the use of masks on inspiratory muscle strength, metabolic parameters, heart rate, subjective perception of effort and the sensation of dyspnea before, during and after an aerobic test of 30 minutes long and a fixed load at lactate threshold. A randomized study of repeated measures will be carried out. A total sample of 35 active participants will be recruited. All participants will carried out a lactate threshold test and then 3 visits to the laboratory (separated at least 48 hours from each other) in order to perform 3 test of 30 minutes long without mask, with a surgical mask or with a FFP2 respirator (in a randomized order) at an intensity around lactate threshold intensity. Maximal inspiratory pressure, oxygen saturation, heart rate, blood lactate concentration, subjective perception of effort and dyspnea will be assessed before, during and after the 3 fixed intensity tests.

Official Title
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Effects of Different Masks on Metabolic Parameters, Inspiratory Muscle Strength and Perceived Effort During Low Intensity Aerobic Exercise

Conditions
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Masks

Intervention / Treatment
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* Diagnostic Test: steady intensity aerobic test of 30 minutes long


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: carrying out at least 2 days of physical activity per week Exclusion Criteria: cardiac disease pulmonary disease chronic inflammatory disease sedentary behaviour

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 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: Other
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Use of FFP2 respirator<br>Using of FFP2 respirator during the 30 minutes test | Diagnostic Test: steady intensity aerobic test of 30 minutes long<br>* the use of different type of masks during an aerobic exercise<br>|
| Active Comparator: Use of surgical mask<br>Using of surgical mask during the 30 minutes test | Diagnostic Test: steady intensity aerobic test of 30 minutes long<br>* the use of different type of masks during an aerobic exercise<br>|
| Sham Comparator: no mask<br>The 30 minutes test will be carried out without mask | Diagnostic Test: steady intensity aerobic test of 30 minutes long<br>* the use of different type of masks during an aerobic exercise<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Inspiratory muscle strength | Inspiratory muscle strength will be measured in mmHg with a Power-breathe device | change from baseline inspiratory muscle strength after the 30 minutes test | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| lactate concentrations | lactate concentration will be measured in mmol/L with a Lactate Pro 2 device | change from baseline after 10 minutes, 20 minutes and 30 minutes during the test | 
| oxygen saturation | oxygen saturation will be measured in % | change from baseline after 10 minutes, 20 minutes and 30 minutes during the test | 
| heart rate | heart rate will be measured in beats per minute with a polar H10 device | change from baseline after 10 minutes, 20 minutes and 30 minutes during the test | 
| rate of perceived effort | rate of perceived effort will be obtained through the Borg´ scale | change from baseline after 10 minutes, 20 minutes and 30 minutes during the test | 
| sensation of dyspnea | sensation of dyspnea will be obtained through a visual analog scale from 0 to 10 points | change from baseline after 10 minutes, 20 minutes and 30 minutes during the test |