Joint angle trajectories are Robust to segment length estimation methods in human reaching.

ABSTRACT:

Background

Quantitative movement analysis is increasingly used to assess motor deficits, but joint angle calculations depend on assumptions about limb segment lengths. These lengths are often estimated from average anthropometric proportions rather than measured directly. The extent to which such assumptions influence joint angle accuracy and variability remains unclear.

Methods

In prior studies, we recorded reaching movements in nine healthy adults using active-marker motion capture system. In this study, we computed arm joint angles with a dynamic model scaled using either measured segment lengths (Individual method) or proportions based on body height (Average method). Each participant served as their own control across two modeling conditions. We compared segment proport

SUBMITTER: Taitano RI 

PROVIDER: S-EPMC12637938 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature