Methods
COVID-19 disease
DISEASE, RECRUITMENT
This was a parallel clinical trial. Via different types of announcements to the medical centers across Rasht City, we invited patients between 50–70 years old with a history of COVID-19 disease (six months after recovery from the acute phase of the disease and with a current negative the polymerase chain reaction (PCR) test) to take part in this study. All sample selection, disease diagnosis, and prescription of exercise protocols were performed under the direct supervision of a treatment team, including health specialists and experts. A total of 67 patients volunteered and then, they were evaluated based on the inclusion and exclusion criteria to find the final qualified group. From 67 volunteers, 40 people were eligible based on the inclusion and exclusion criteria. For determining the sample size, according to the study of Liu et al. [Regarding this continuous outcome variable, the sample size was calculated as 13 subjects per group with an average effect size of 50%, 95% confidence interval, and 80% study power. Due to the possibility of dropouts, the final sample size was determined Consort diagram of the study showing sample recruitment and allocation processes