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

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 ([Formula: see text]) 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 ([Formula: see text]) years, followed by a decline. The strongest correlations were found for peak leg press force ([Formula: see text]) and leg press rate of force development ([Formula: see text]). STS power correlated significantly with handgrip strength but not with the echogenicity index, highlighting the clinical relevance of separately evaluating each of these indicators.