Investigating the influence of working status changes on physical activity and non-communicable diseases in Korean middle-aged and older adults: insights from a longitudinal panel study

Non-communicable diseases (NCDs) are a major global health challenge and occupational status is a critical determinant influencing NCD development, yet many cross-sectional studies have only linked current occupational status with specific diseases, overlooking broader temporal factors. The primary aim of the present study was to comprehensively elucidate the intricate interplay between alterations in working status, NCDs, and physical activity (PA) among Korean middle-aged and older adults, employing a longitudinal panel study design. This study utilized longitudinal data from the Korean Longitudinal Study of Aging, covering the period from 2006 to 2020, with a median follow-up duration of 10 years. (n = 5101 participants aged 45 years and older). Changes in working status were categorized, focusing on (1) yes-yes (e.g., indicative of sustained employment), (2) yes-no (e.g., denoting a transition from employment to non-employment), (3) no-yes (e.g., representing a shift from non-employment to employment), and (4) no-no (reflecting a continual non-employment status). PA was defined as the total minutes of moderate-to-vigorous PA per week and categorized into two groups: