IRCT20251122068071N1 IRCT 2025-11-25 Shahid Beheshti University of Medical Sciences Studying the effect of inspiratory breathing exercises in patients with lower limb venous insufficiency Studying the effect of inspiratory breathing exercises on the quality of life and vascular flow of patients with lower limb venous insufficiency referred to Hospital 2025-12-22 anticipated 50 Recruiting https://irct.ir/trial/87641 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: Simple randomization method, individual randomization unit, randomization tool: random number table, double blind. For randomization, the Simple Randomization method is used using a random number table. For this purpose, two groups (A, B) are considered. We choose one of the rows of the random number table at will and we know that the numbers in each row will be between 0 and 9. Then we assign the numbers 0-4 to treatment A and the numbers 5-9 to treatment B. Suppose the numbers for the first row are as follows: 0, 5, 2, 7, 8, 4. Therefore, the number 0 is assigned to treatment A, the number 5 to treatment B, the number 2 to treatment A, .... Therefore, the first person receives treatment A, the second person receives treatment B , Blinding description: Patients are not aware that the IMT device is the main component of the intervention. Both groups have exercises, so no obvious sense of difference is created. Also, the vascular surgeon is blinded to the group allocation. 3 Lower Limb Venous Insufficiency. Intervention 1: Control group: In the control group, calf muscle strengthening exercises will be performed three sessions per week as routine care, with calf strengthening exercises performed two sessions per week in three sets and 10 repetitions; for the first month, three gastrosoleus stretches, two-legged cuff raises while sitting on a chair, and two-legged cuff raises on a flat surface will be performed; in the second month of intervention, three exercises: single-legged cuff raises on a flat surface, two-legged cuff raises on a board, and tiptoe walking for three to one minute will be added to the previous exercises. Intervention 2: Intervention group: In the intervention group, in addition to calf muscle strengthening exercises, patients will be given inspiratory breathing exercises using the IMT device for 8 weeks, five days per week, twice a day, and 30 breaths per session, with a gradual increase in the degree of difficulty (one degree per week). 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.