Participants in experimental group were instructed to close their left nostril by left index finger and inhale through their right nostril for six seconds, then closing the right nostril and holding breath for six seconds. Afterward, they exhaled through the left nostril slowly for six seconds. Next, they inhaled through left nostril, keeping the right nostril closed for six seconds then hold the breath by closing both nostrils for six seconds subsequently, and then exhaled through the right nostril, keeping the left closed for six seconds repeating these steps several times for 10 minutes

Forced Expiratory Volume in 1 second (FEV1) is a measurement of how much air a person can forcefully exhale from their lungs in one second

Forced vital capacity (FVC) is a measurement of lung function that quantifies the maximum amount of air a person can forcefully exhale after taking the deepest breath possible

Peak expiratory flow rate (PEFR) measures the maximum speed of air that a person can forcefully exhale in one breath

The Asthma Control Test (ACT) is scored by assigning a value from 1 to 5 to each response in the 5-question survey, then summing these values for a total score ranging from 5 to 25. A higher score indicates better asthma control. A score of 20 or higher generally suggests well-controlled asthma.

The Standardized Asthma Quality of Life Questionnaire (AQLQ(S)) is a 32-item questionnaire used to assess the impact of asthma on an individual's quality of life, specifically focusing on the physical, emotional, and social aspects. 7-point Likert scale (7 = not impaired at all - 1 = severely impaired). Scores range 1-7, with higher scores indicating better quality of life.