title: Investigation of the mass distribution of a detailed seated male finite element model.
abstract: Accurate mass distribution in computational human body models is essential for proper kinematic and kinetic simulations. The purpose of this study was to investigate the mass distribution of a 50th percentile male (M50) full body finite element model (FEM) in the seated position. The FEM was partitioned into 10 segments, using segment planes constructed from bony landmarks per the methods described in previous research studies. Body segment masses and centers of gravity (CGs) of the FEM were compared with values found from these studies, which unlike the present work assumed homogeneous body density. Segment masses compared well to literature while CGs showed an average deviation of 6.0% to 7.0% when normalized by regional characteristic lengths. The discrete mass distribution of the FEM appears to affect the mass and CGs of some segments, particularly those with low-density soft tissues. The locations of the segment CGs are provided in local coordinate systems, thus facilitating comparison with other full body FEMs and human surrogates. The model provides insights into the effects of inhomogeneous mass on the location of body segment CGs.
authors.affiliation: Virginia Tech-Wake Forest University Center for Injury Biomechanics, Winston-Salem, NC, and with the Wake Forest University School of Medicine, Winston-Salem, NC.
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Vavalle
authors.forename: A Bradley
authors.initials: AB
authors.lastname: Thompson
authors.forename: Ashley R
authors.initials: AR
authors.lastname: Hayes
authors.forename: Daniel P
authors.initials: DP
authors.lastname: Moreno
authors.forename: Joel D
authors.initials: JD
authors.lastname: Stitzel
authors.forename: F Scott
authors.initials: FS
authors.lastname: Gayzik
mesh_terms: D000886:Anthropometry / Q000379:methods*; D001835:Body Weight; D003198:Computer Simulation; D020342:Finite Element Analysis; D006112:Gravitation; D006801:Humans; D008297:Male; D008953:Models, Anatomic; D008954:Models, Biological; D011187:Posture / Q000502:physiology*; D011312:Pressure