Aims: Patients with chronic heart failure (CHF) are characterized by debilitating muscle weakness, inability of moving, and resultant psychological disadvantages. Therefore, this study aimed to investigate the acute effects of resistance exercise (RE) and its impact on psychological health and peak muscle contraction (PMC) in patients with CHF.
Methods: This randomized controlled trial was performed between October 2019 to December 2020. Fifty-seven patients with CHF (NYHA Class II, III) underwent initial assessments for 6 minutes walking test (6MWT), psychological response to exercise and PMC. They were randomly divided into R1, R2, and control groups. The intervention consisted of performing a short aerobic exercise including 15 minutes of walking at an intensity of 50%-reserved heart rate for all three groups and additional RE with the intensity of 50%-1RM and 75%-1RM for R1 and R2 groups, respectively.
The results showed that there was no significant difference between groups for 6MWT, peak muscle contraction and psychological response to exercise after the intervention (P≥0.05). PMC and psychological response to exercise improved significantly in all groups, however 6MWT increased significantly just in group R2 after the intervention. PWB was related to peak muscle contraction of left knee extensors and dorsiflexors positively and PD and FATwas related to walking distance and peak muscle contraction of left knee extensors and dorsiflexors negatively.
Conclusions: Performing just one session of exercise had significant beneficial impacts on, PMC, and psychological response in patients with CHF regardless of the exercise type and RE intensty.However, walking distance (6MWT) increased significantly in group R2 (75% of 1-RM) that shows performing higher resistance exercise is both safe and lead on functional advantages in CHF patients. There was a positive relationship between PWB and 1RM and negative relationship between PD and fatigue with 1RM.