The participants received a high-intensity interval exercise program of walking or running on a treadmill for approximately 40 minutes. The training included a 10-minute warm-up at low intensity. High-intensity interval exercise at a ratio of 1:1 (high intensity for 1 minute at 85-90% of maximum heart rate, then alternating with low intensity 50-55% of maximum heart rate for 1 minute ).

The participants received a high-intensity interval exercise program of walking or running on a treadmill for approximately 40 minutes. The training included a 10-minute warm-up at low intensity. High-intensity interval exercise at a ratio of 1:2 (high intensity for 1 minute at 85-90% of maximum heart rate, then alternate with low intensity 50-55% of maximum heart rate for 2 minutes).

The participants received a high-intensity interval exercise program of walking or running on a treadmill for approximately 40 minutes. The training included a 10-minute warm-up at low intensity. High-intensity interval exercise at a ratio of 1:1 (high intensity for 1 minute at 85-90% of maximum heart rate, then alternating with low intensity 50-55% of maximum heart rate for 1 minute).

Nasal symptoms were assessed using Total Nasal Symptom Score (TNSS) questionnaire. The subjects were asked to score symptoms of persistent allergic rhinitis before and after yoga training protocol. The total nasal symptom scores were computed as the sum of four individual nasal symptom scores; nasal congestion, itching, sneezing, and rhinorrhea. The scores ranged from 0 to 3 scale (0=none, 1=mild, 2=moderate, 3= severe)

The subjects placed a mask, which is turned onto a plastic cylinder through which the air passes during inspiration, over the nose and mouth and inspired forcefully through the nose, with lips tightly closed. Inside the cylinder, there is a diaphragm that moves to the airflow, and the maximum peak flow is registered in a scale range from 30-370 L/min. During the procedure, the subjects placed a mask over the nose and mouth and inspired forcefully through the nose, with lips tightly closed.

Laser Doppler flowmetry (DRT4 moor instrument, UK.) was used to measure of the nasal blood flow (NBF). Before the test each subject rested for one hour in a separate room. During the test, they were instructed to breathe normally breathe and not to speak, cough, or move. A lateral endoscopic probe with a flexible nylon sheath 1.34-mm-diameter flexible nylon sheath was placed to the front of the nose. Nasal blood flow measurements were performed before immediately, 15 minutes, 30 minutes, 45 minutes, and 60 minutes after exercise for each exercise program.

The participants were asked to wear a nose clip while sitting on a chair, and the researcher gave the participants the step-by-step protocol to prevent an incorrect maneuver. For the FVC maneuver, three cycles of slow normal breathing were performed before demonstrating forced inspiration and expiration.

Participants inhaled deeply for two to three seconds before exhaling slowly. Normally, it took 10 seconds to exhale.