Basic inertial quantities including multi-segment trunk of fit, young males obtained based on personalized data

Area of Science:

• Biomechanics
• Human Anatomy
• Anthropometry

Background:

• Existing inertial data often relies on old cadavers.
• Trunk segments are frequently simplified in biomechanical models.
• Accurate inertial properties are vital for dynamic simulations.

Purpose of the Study:

• To determine basic inertial quantities for young, fit males.
• To segment the trunk into five distinct parts.
• To update anthropometric models with current data.

Main Methods:

• Direct measurements (circumferences, skin-folds) and photography of 30 young males.
• Application of Clauser et al. and Erdmann's methods for mass and center of mass estimation.
• Personal data integration for precise inertial quantity calculations.

Main Results:

• Relative mass of trunk parts (thorax, abdomen, pelvis) comparable to older cadaver data.
• Significant differences in relative mass for shoulders and lower extremities.
• Young males exhibit ~37% of body mass in lower extremities, versus ~31-32% in older subjects.

Conclusions:

• The study provides essential inertial data for young, fit males.
• Updated data is critical for biomechanical analyses in sports (e.g., jumping) and safety (e.g., crash tests).
• Findings support improved ergonomic and medical modeling for younger populations.