STS rel declined with increasing age in both men and women. Low STS rel was associated with frailty (OR = 5.6 ) and low habitual gait speed (HGS) (OR = 2.7 ) in men while low STS rel was associated with frailty (OR = 6.9 ) low HGS (OR = 2.9 ), disability in activities of daily living (OR = 2.1 ), and low quality of life (OR = 1.7 ) in women. Cut-off values for low STS rel were 2.5 W kg −1 in men and 1.9 W kg −1 in women. In women, a negative association with age was observed throughout the old adult life (− 1.2 to − 2.0% year−1 p < 0.001). 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). Sex- and age-adjusted segmented and logistic regression analyses and receiver operator characteristic curves were used. STS power parameters assessed by validated equations, BMI and Legs SMI assessed by dual-energy X-ray absorptiometry were recorded. Cross-sectional design (1369 older adults). The purposes of this study were: (i) to evaluate the association of sit-to-stand (STS) power and body composition parameters 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.
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