We aimed to describe how sedentary behavior time changed over the first 9 months after AMI and to examine the characteristics observed before and during the hospitalization of individuals with prolonged sedentary behavior time after AMI.
This prospective observational study was conducted between July 2021 and February 2024. One hundred and seventy-two consecutive male patients with AMI were enrolled in this study. During hospitalization, the subjects underwent rehabilitation according to the AMI rehabilitation program outlined in the guidelines and were instructed to interrupt and reduce their sedentary behavior time, along with receiving exercise guidance, at discharge. The sedentary behavior time before and 9 months after the onset of AMI was assessed using a questionnaire conducted through face-to-face interviews. Subjects were divided into an increased sedentary behavior group (an increase of more than 2 h/day, n = 47, aged 69 ± 10 years) and a decreased sedentary behavior group (an increase of less than 2 h/day, no change, or a decrease; n = 125, aged 65 ± 12 years). Age, job status (having a job or not having a job), sedentary behavior time before AMI, Killip's classification, estimated glomerular filtration rate (eGFR), and phase angle were used as indices and compared between the groups using multivariate analysis. Prior to this, independent variables were selected using LASSO regression analysis.
The sedentary behavior time of the subjects increased significantly from 240 (120–297) min/day before AMI to 291 (171–325) min/day 9 months after AMI (p 0.05). Patient characteristics before AMI associated with prolonged sedentary behavior time included not having a job (odds ratio: 5.28, 95% confidence interval: 2.11–13.91, p 0.05), sedentary behavior time (odds ratio: 0.996, 95% confidence interval: 0.993–0.998, p 0.05), and eGFR at discharge (odds ratio: 0.98, 95% confidence interval: 0.96–1.00, p = 0.06).
Individuals who do not have a job, experience shorter sedentary behavior before AMI, and present with low renal function at discharge are at risk of prolonged sedentary behavior in the future.
Our findings suggest the characteristics for identifying subjects who require more intensive and effective support to reduce their sedentary behavior time.
Acute Myocardial Infraction
Prospective observational study
