This study validates a new smartphone application for analyzing sit-to-stand (STS) movements in the elderly, comparing its accuracy and reliability against traditional optical motion capture systems (OMCs).
Using data from 57 trials, the app employed Linear Regression to refine its measurement algorithms, resulting in high predictive accuracy (R² values of 0.92–0.96) for trunk, hip, and knee joint angles. Statistical analysis showed no significant differences between the app and OMCs, with strong agreement indicated by low MAE and RMSE values.
The research concludes that the STS app is a cost-effective, practical, and reliable alternative for kinematic analysis, with significant potential for use in clinical and community health assessments.