title: Hyper-elastic properties of the human sternocleidomastoideus muscle in tension.
abstract: Numerical models of the human body require realistic mechanical properties of the muscles as input, but, generally, such data are available only for animals' muscles. As a consequence, the aim of this study was to identify the hyper-elastic behavior of the human sternocleidomastoideus muscle in tension using different constitutive laws. Ten sternocleidomastoideus muscles were tested in vitro. The hyper-elastic behavior was modeled with an exponential law and a hyper-elastic constitutive law studied analytically. The latter was also studied with an inverse approach using a subject-specific, finite-element model of each muscle. The three approaches were compared statistically. From these laws and methods, the shear modulus μ (4 to 98 kPa) and the curvature parameter α (17 to 52) were identified. Both the analytical and finite-element approaches gave parameters of the same order of magnitude. The parameters of the exponential and hyper-elastic laws were linked thanks to simple linear equations. Our results evidence that the hyper-elastic tension behavior of human sternocleidomastoideus muscle can be described using a simple model (exponential) considering basic geometric features (initial length and cross-sectional area).
authors.affiliation: Arts et Metiers ParisTech, LBM, 151 bd de l'Hopital, 75013 Paris, France. laurelise.gras@gmail.com
authors.forename: Laure-Lise
authors.initials: LL
authors.lastname: Gras
authors.forename: David
authors.initials: D
authors.lastname: Mitton
authors.forename: Philippe
authors.initials: P
authors.lastname: Viot
authors.forename: Sébastien
authors.initials: S
authors.lastname: Laporte
mesh_terms: D000368:Aged; D001696:Biomechanical Phenomena; D004548:Elasticity / Q000502:physiology*; D005260:Female; D020342:Finite Element Analysis; D006801:Humans; D008875:Middle Aged; D009334:Neck Muscles / Q000502:physiology*; D013314:Stress, Mechanical