Subjects were asked to remain in a standing position with their feet shoulder-width apart. The right hand was placed on the chest and the left hand on the abdomen. Inhale to make the abdomen bulge and exhale to make the abdomen sink (inhale through the nose and exhale through the mouth). This was done 2 times a day, once in the morning and once in the afternoon. Complete 3 sets of 8 breaths each. Each breath lasts 10 seconds (4 seconds inhaling and 6 seconds exhaling).

Resonant breathing was used on the subjects, using nasal inhalation and oral exhalation, for a total of 12 weeks.

The scale is divided into four levels

Grade 1 is unrestricted activity. Daily physical activity does not cause significant shortness of breath, fatigue or palpitations Grade 2 is a mild limitation of activity. Asymptomatic at rest, daily activities may cause significant shortness of breath, fatigue or palpitations Grade 3 is marked limitation of activity. May be asymptomatic at rest, but may cause significant shortness of breath, fatigue, or palpitations with less than daily activity.

Grade 4 is symptomatic at rest, with discomfort associated with any physical activity. Class IVa for those who can move around indoors or at the bedside without intravenous drug administration; Class IVb for those who cannot get out of bed and require intravenous drug administration.

The magnitude of overall longitudinal myocardial strain in the left ventricle on two-dimensional speckle tracking echocardiograms as an average of the peak longitudinal strain in all myocardial segments. The normal range is (-25% to -17%) in men and (-25% to -18%) in women.

Blood pressure included both systolic and diastolic blood pressure and was observed before and after the intervention for any reduction in blood pressure.