Effects of Inspiratory Muscle Training on Respiratory Muscle Strength, Trunk Control, Balance and Functional Capacity in Stroke Patients: A Single-blinded Randomized Controlled Study

Objective: Aim of the study was to examine the effects of inspiratory muscle training (IMT) on respiratory function, respiratory muscle strength, trunk control, balance, and functional capacity in stroke patients.

Methods: 21 stroke individuals were randomly divided into two groups as control group and treatment group. Respiratory function test, Maximal Inspiratory Pressure (MIP) and Maximal Expiratory Pressure (MEP) were evaluated. Also, Trunk Impairment Scale (TIS), Timed Up and Go Test (TUG) Berg Balance Scale (BBS), and Six-Minute Walk Test (6MWT) were performed. Neurodevelopmental treatment program was performed in both groups for 5 days a week for 6 weeks, and IMT was given to the treatment group. IMT was started from 40% of MIP.

Results: After treatment, respiratory functions, respiratory muscle strength, and trunk control and balance improved in the treatment group. In the control group; however, only the balance level was improved. When the changes in the evaluation parameters between the groups were compared, there were only statistically significant differences in the TIS, Peak Expiratory Flow (PEF) and MIP in the treatment group (p˂0.05), the change amounts in other evaluation parameters were similar (p˃0.05). When the effect size of the groups was compared, the effect size of the variables in the treatment group was found to be higher.

Conclusion: As a conclusion, IMT, which was given in addition to the neurological physiotherapy and rehabilitation program to our patients, improved inspiratory muscle strength and trunk control. We believe that this result will raise awareness for physiotherapists working in the field of neurological rehabilitation about including respiratory muscle training in the rehabilitation program of stroke patients.