A clinical trial will be carried out in the area of physiotherapy and rehabilitation of the "Centro Integral de Rehabilitacin S.C. at the Hospital Angeles Lomas" in Mexico. Whose population will be hospitalized patients at the angeles lomas hospital. This research is carried out with the purpose of knowing and applying the technique of contra-relax at the muscular level but in this case extrapolated in the inspirometer. This project will have 3 arms (1. New intervention protocol created by the main author in the use of the inspirometer, 2. Conventional use of the inspirometer, 3. breathing exercises) with a population of hospitalized patients and whose purpose will be to determine the effectiveness of the new intervention protocol and compare it with the current protocol and respiratory exercises.

The present project will be carried out with hospitalized patients who meet the criteria of occlusion and who, after passing the exclusion criteria, become part of a randomized clinical trial type investigation with a basic probabilistic sampling through a random number table, which Your order will be random through the Microsoft Excel 16.0 program, so we will obtain an experimental group 1, which will be the new intervention protocol for the use of the inspirometer (The maximum inspiratory capacity will be obtained and that results will be taken out 50% and 80% to have it as muscle strength training values for the respiratory muscles based on the contra-relax technique), an experimental group 2 (Conventional use of the conventional way) and a control group (breathing exercises without the use of inspirometer).

After your hospital stay, the post-training changes of the different groups will be determined taking as a reference and control value the maximum inspiratory volume and the maximum expiratory volume. The variables to be determined will be: Fatigue, dyspnea, maximum inspiratory capacity, maximum expiratory volume, quality of life, vital signs (heart rate, respiratory rate, blood pressure).