Patients who are followed up in the cardiology clinic with a diagnosis of CHF, who have had a CRT implant at least 1 year ago, and who do not receive cardiac rehabilitation will be included. The aim of the study is to investigate the effects of inspiratory muscle training (IMT) on exercise capacity, respiratory muscle strength, NTproBNP and quality of life.

Groups Intervention group: Treatment with IMT Control group: Standard care Study hypothesis;

1. Does IMT have an effect on exercise capacity and quality of life in patients with CRT?
2. Does IMT have an effect on NTproBNP in patients with CRT?

Inclusion Criteria:

• Patients who were followed up in the cardiology clinic with a diagnosis of CHF,
• CRT implanted at least 1 year ago,
• did not receive cardiac rehabilitation,
• 45-75 years old,
• communicate in Turkish,
• NYHA II-III

Exclusion Criteria:

• orthopedic and neurological disorders that may prevent walking,
• acute respiratory tract infection in the last month,
• NYHA I were not included in this study because they were generally not hospitalised and the problems were managed with outpatient diagnosis and treatment, and patients with class IV were not included in this study because they showed severe symptoms for medical and ethical reasons and they were not wanted to be forced with this long-lasting survey application process.

Doctor who doing ekogardiography.