Inspiratory Muscle Training on Diaphragm Thickness, Inspiratory Muscle Pressure and Physical Function

Study Overview
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Brief Summary
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Fatigue of the respiratory muscles is one of the limitations of exercise at high intensity, although the mechanisms that explain it are not yet clear. This fatigue would cause a decrease in physical performance and could limit the functional capacity of the subject. In this sense, it has been shown that specific training of respiratory muscles, especially inspiratory muscles, improves their strength and resistance both in healthy people and in people with pathologies; managing to improve the quality of life and both physical and sports performance. This study, which follows the quantitative method and proposes an analytical, experimental, longitudinal and prospective design (with the aim of conducting a randomized clinical trial), proposes an intervention based on performing a specific training of inspiratory muscles for 8 weeks, taking 30 maximum inspirations at 60% of the PIM (maximum inspiratory pressure), 2 times a day for 5 days a week; with the aim of assessing the effects on inspiratory function, cardiorespiratory fitness when performing a stress test (Harvard step test) and diaphragm thickness measured by ultrasound. 40 healthy subjects between 18 and 25 years old will be recruited and divided into two groups: an experimental group (n = 20) and a control group (n = 20).

Official Title
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Effects of Inspiratory Muscle Training on Diaphragm Thickness, Inspiratory Muscle Pressure and Physical Function in Healthy Young Adults

Conditions
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Healthy

Intervention / Treatment
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* Other: Inspiratory muscle strength training


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: healthy university students Exclusion Criteria: Suffering or having suffered aortic aneurysm; pneumothorax; rib wall or pulmonary fistulas; recent trauma or surgery to the upper airway or thoracoabdominal; recent myocardial infarction or angina; retinal detachment, glaucoma, or recent eye surgery; increased intracranial pressure (tonsillar wedge, meningocele, hydrocephalus); abdominal hernias and acute middle ear problems.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 25 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: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Muscle inspiratory strength training<br>An 8-week muscle inspiratory muscle strength training | Other: Inspiratory muscle strength training<br>* Inspiratory muscle training during 8 weeks, 30 inspirations at 60% of the PIM (maximum inspiratory pressure), 2 times a day for 5 days per week.<br>|
| No Intervention: No training program<br>No intervention | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Diaphragm muscle thickness | Diaphragm muscle thickness will be measured in mm by an ultrasound device | Change from baseline diaphragm muscle thickness at 8 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Inspiratory muscle strength | Inspiratory muscle strength will be measured in % by a POWER-breathe device | Change from baseline inspiratory muscle strength at 8 weeks | 
| Physical Efficiency Index | Physical efficiency Index will be obtained by the Harvard Test | Change from baseline physical efficiency index at 8 weeks |