IRCT20200611047727N6 IRCT 2023-03-14 Shahid Beheshti University of Medical Sciences The effect of various types of interval exercises in patients with COPD The effect of interval exercises on heart rate variability in hospitalized patients with chronic obstructive pulmonary disease (COPD) 2023-05-22 anticipated 48 Complete https://irct.ir/trial/68792 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Supportive, Randomization description: Simple randomization method, individual randomization unit and random number table randomization tool. For randomization, we use a table consisting of random digits from 0 to 9. Each of the figures in this table is repeated the same on average. We start from the first row of the table and move down row by row. For three treatments, we put numbers 1 to 3 for treatment A, numbers 4 to 6 for treatment B, and numbers 7 to 9 for treatment C. We continue the above process until three groups are completed, Blinding description: In order to prevent any possible complications, the doctor and clinical caregiver are fully aware of the assignment of treatment groups. Researchers responsible for data collection and analysis are not aware of the allocation of different study groups. 2 Chronic obstructive pulmonary disease. Intervention 1: Intervention group: After warming up, the patients do 30 seconds of activity with an intensity of 85% of the maximum oxygen peak, then they do 30 seconds of recovery with 40% of the maximum oxygen peak. Patients will have passive recovery after doing 8 sets of 4 minutes. After 4 minutes of recovery, they will perform the same as above for another 8 minutes. After finishing the activity, the patients will perform cooling movements for 5 minutes. Intervention 2: Intervention group: After warming up for 5 minutes, the patients perform 4 minutes with an intensity of 85% of the maximum oxygen peak. Then they perform 3 minutes of recovery with 40% of the maximum oxygen peak. Patients perform this protocol in 3 sets for 21 minutes. Intervention 3: Control group: Patients receive only routine treatments and no exercise intervention. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is There is no further information