• Bokun Kim, Yosuke Osuka, Yoshiro Okubo, Xiaoguang Zhao, Gwon-Min Kim, and Sechang Oh.
• Future Convergence Research Institute, Changwon National University, Changwon, Republic of Korea; Human Community Renovation Research Center, R Professional University of Rehabilitation, Tsuchiura, Ibaraki, Japan.
• Am J Prev Med. 2024 Oct 28.

IntroductionPhysical activity is widely accepted as a therapeutic approach to age-related muscle mass loss. However, it is unclear whether all physical activity domains benefit muscle mass maintenance. This study investigated the association between low muscle mass and domain-specific physical activity, including leisure-time and occupational moderate-to-vigorous physical activity (MVPA).MethodsThis study included 27,357 middle-aged and older individuals (≥40 years) whose data were collected from 2014 to 2022 and analyzed in 2024. Low muscle mass was defined as a muscle mass index 2 SDs below the sex-specific average of 9,426 young individuals (aged 20-39 years). Leisure-time and occupational MVPA were assessed using the Global Physical Activity Questionnaire and categorized as 0 min/wk, 1-149 min/wk, and ≥150 min/wk. Logistic regression analysis focused on all participants, and additional analyses stratified by sex, age, sedentary time, and transfer time were performed.ResultsFor leisure-time MVPA, participants with 1-149 min/wk and ≥150 min/wk had significantly lower odds of low muscle mass compared to those with no MVPA, with ORs of 0.795 (95% CI=0.691, 0.914) and 0.740 (95% CI=0.649, 0.843), respectively (p<0.01 for both). No significant association was found between occupational MVPA and low muscle mass. These findings were consistent across different strata of sex, age, sedentary time, and transfer time.ConclusionsLeisure-time MVPA is inversely associated with low muscle mass, whereas occupational MVPA shows no association, highlighting the importance of dynamic movements of sufficient intensity and recuperation time in maintaining muscle mass.Copyright © 2024 Elsevier Inc. All rights reserved.

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