Diaphragmatic Training on GERD

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he goal of this clinical trial is to evaluate the effects of diaphragm-oriented breathing training on patients with gastroesophageal reflux disease (GERD). This study will compare two non-invasive respiratory interventions-diaphragmatic breathing exercise (DBE) and volume-oriented incentive spirometry (VIS)-in terms of their impact on esophageal function and health-related quality of life.The main questions it aims to answer are:Does DBE or VIS improve GERD symptoms as measured by the GERD Questionnaire (GERDQ)?Do these interventions reduce esophageal acid exposure time and the number of reflux episodes?Do these interventions improve lower esophageal sphincter (LES) pressure and esophageal motility?Do these interventions improve GERD-related quality of life as measured by the GERD-HRQL questionnaire?Researchers will compare three groups: DBE, VIS, and a control group receiving standard care, to determine whether diaphragm-oriented breathing training provides additional benefits over usual management.Participants will:Be randomly assigned to one of three groups (DBE, VIS, or control)Perform the assigned intervention for 6 weeksUndergo baseline and post-intervention assessments, including symptom questionnaires and esophageal function testing Record symptoms and adherence in a daily diary