title: Creep behavior of passive bovine extraocular muscle.
abstract: This paper characterized bovine extraocular muscles (EOMs) using creep, which represents long-term stretching induced by a constant force. After preliminary optimization of testing conditions, 20 fresh EOM samples were subjected to four different loading rates of 1.67, 3.33, 8.33, and 16.67%/s, after which creep was observed for 1,500 s. A published quasilinear viscoelastic (QLV) relaxation function was transformed to a creep function that was compared with data. Repeatable creep was observed for each loading rate and was similar among all six anatomical EOMs. The mean creep coefficient after 1,500 seconds for a wide range of initial loading rates was at 1.37 ± 0.03 (standard deviation, SD). The creep function derived from the relaxation-based QLV model agreed with observed creep to within 2.7% following 16.67%/s ramp loading. Measured creep agrees closely with a derived QLV model of EOM relaxation, validating a previous QLV model for characterization of EOM biomechanics.
authors: Department of Ophthalmology, Jules Stein Eye Institute, University of California Los Angeles, 100 Stein Plaza, UCLA, Los Angeles, CA 90095-7002, USA.
authors: Lawrence
authors: L
authors: Yoo
authors: Hansang
authors: H
authors: Kim
authors: Andrew
authors: A
authors: Shin
authors: Vijay
authors: V
authors: Gupta
authors: Joseph L
authors: JL
authors: Demer
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D002417:Cattle; D004548:Elasticity / Q000502:physiology; D008954:Models, Biological; D009126:Muscle Relaxation / Q000502:physiology*; D009801:Oculomotor Muscles / Q000502:physiology*; D016474:Weight-Bearing / Q000502:physiology