The STS test and its correlation with common clinical indicators for an Argentinian population sample

delixación: Scopus ; This study assesses the Sit-To-Stand (STS) power across different age groups, and revises the biomechanical basis of existing power equations. Cross-sectional data from 159 Argentinian individuals (18 to 90 years) were analyzed, including 5 repetitions STS, ultrasonography, handgrip and leg press tests. Regression analysis and statistical hypothesis tests where used to find correlations and differences within obtained data. A large correlation () was observed between average power and root mean squared (RMS) power, suggesting that existing mean power equations are clinically sufficient, as inertial effects are negligible. STS power peaked at approximately () years, followed by a decline. The strongest correlations were found for peak leg press force () and leg press rate of force development (). STS power correlated significantly with handgrip strength but not with the echogenicity index, highlighting the clinical relevance of separately evaluating each of these indicators. © The Author(s) 2026. ; L. I., A. P. and G. Arcuri received funding from Universidad del Gran Rosario, PID No 188/2020 UGR. ; Si