부산대학교 도서관

Abstract Background The associations between body flexibility and sarcopenia were not well understood. This study aimed to explore the cross‐sectional and longitudinal associations of flexibility with sarcopenia. Methods Our study selected participants aged 50–80 from the WELL‐China cohort and the Lanxi cohort. Participants from the urban area of the Lanxi cohort were followed up 4 years later. Body flexibility was measured by the sit‐and‐reach test. Muscle mass was evaluated by dual‐energy X‐ray absorptiometry. Muscle strength was evaluated using handgrip strength. Sarcopenia was defined as having both low muscle mass and low muscle strength. We used multivariable logistic regressions to assess the cross‐sectional associations of body flexibility with low muscle mass, low muscle strength and sarcopenia. We also used multivariable logistic regressions to explore the associations of baseline flexibility and 4‐year changes in flexibility with incident low muscle mass, low muscle strength and sarcopenia. Results A total of 9453 participants were enrolled in the cross‐sectional study, and 1233 participants were included in the longitudinal analyses. In the cross‐sectional analyses, compared with low body flexibility, high body flexibility was inversely associated with low muscle mass (odds ratio [OR], 0.58; 95% confidence interval [CI], 0.50–0.68; P