BACKGROUND AND OBJECTIVES: Nearly 23% of elderly patients hospitalized due to acute coronary syndrome have reduced muscle strength. It is assumed that these patients would better benefit from a complex training-a combination of endurance, strength, balance, coordination, and flexibility-in order to reduce the loss of muscle strength and mass and improve functional capacity. The aim of this study was to assess the effectiveness and safety of two different complementary resistance and balance training programs during short-term cardiac rehabilitation (CR) in elderly patients after a percutaneous or surgical intervention due to acute coronary syndrome. MATERIALS AND METHODS: This randomized controlled trial was conducted from January 2020 to February 2021 in one Lithuanian rehabilitation hospital. A total of 63 participants who met the inclusion criteria were randomly assigned to three groups (at the ratio of 1:1:1): control (CG, n = 19), intervention 1 (IG-1, n = 26), and intervention 2 (IG-2, n = 18). All the patients attended a usual inpatient CR program of a mean duration of 18.7 +/- 1.7 days, while the patients assigned to the intervention groups (IG-1 and IG-2) additionally received different resistance and balance training programs three days a week. Functional capacity, with 6-minute walk test (6MWT) and cardiopulmonary exercise testing (CPET), as well as physical performance, with the short physical performance battery (SPPB) test and one repetition maximum test (1RM) for leg press, were assessed at baseline and after CR. RESULTS: The mean age of the participants was 72.9 +/- 5.5 years; 73% were men. All parameters of functional capacity and physical performance improved significantly after CR (p < 0.05), except for peak VO2 that improved only in the IG-1. Comparison of CR effectiveness among the groups revealed no significant differences. CONCLUSIONS: All three rehabilitation programs were safe and well tolerated by elderly patients aged >= 65 years as well as improved functional capacity (6-minute walk distance and peak workload) and physical performance (SPPB and 1RM). Complementary resistance and balance training with traditional physical therapy means and exercises with mechanical devices did not show greater benefits for the results of physical performance compared with the usual CR program.

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