Relative sit-to-stand power cut-off points and their association with negatives outcomes in older adults
Ivan Baltasar‐Fernandez, Julián Alcázar, Asier Mañas, Luis M. Alegre, Ana Alfaro‐Acha, Leocadio Rodríguez‐Mañas, Ignacio Ara, Francisco J. García‐García, José Losa‐Reyna
Abstract
Abstract The purposes of this study were: (i) to evaluate the association of sit-to-stand (STS) power and body composition parameters [body mass index (BMI) and legs skeletal muscle index (SMI)] with age; (ii) to provide cut-off points for low relative STS power (STS rel ), (iii) to provide normative data for well-functioning older adults and (iv) to assess the association of low STS rel with negative outcomes. Cross-sectional design (1369 older adults). STS power parameters assessed by validated equations, BMI and Legs SMI assessed by dual-energy X-ray absorptiometry were recorded. Sex- and age-adjusted segmented and logistic regression analyses and receiver operator characteristic curves were used. Among men, STS rel showed a negative association with age up to the age of 85 years (− 1.2 to − 1.4% year−1 ; p < 0.05). In women, a negative association with age was observed throughout the old adult life (− 1.2 to − 2.0% year−1 ; p < 0.001). Cut-off values for low STS rel were 2.5 W kg −1 in men and 1.9 W kg −1 in women. Low STS rel was associated with frailty (OR [95% CI] = 5.6 [3.1, 10.1]) and low habitual gait speed (HGS) (OR [95% CI] = 2.7 [1.8, 3.9]) in men while low STS rel was associated with frailty (OR [95% CI] = 6.9 [4.5, 10.5]) low HGS (OR [95% CI] = 2.9 [2.0, 4.1]), disability in activities of daily living (OR [95% CI] = 2.1 [1.4, 3.2]), and low quality of life (OR [95%CI] = 1.7 [1.2, 2.4]) in women. STS rel declined with increasing age in both men and women. Due to the adverse outcomes related to STS rel , the reported cut-off points can be used as a clinical tool to identify low STS rel among older adults.