title: Analysis of rat papillary muscle transverse deformation by laser diffraction.
abstract: We use laser diffraction in the analysis of the transversal deformation that the papillary muscle of the female and male Wistar rat may undergo when is subjected to different tension (tension range, 0-30 mN) in the longitudinal plane. Papillary muscles from the right ventricle were illuminated at normal incidence with a He-Ne laser lasing at 594 nm at room temperature. The far-field diffraction pattern projected to a screen was recorded with a digital camera for its analysis. The analysis of the stress-strain curves from the two experimental groups shows that the papillary muscles from male rats exhibit a higher stiffness in the transversal axis compared to the female rats.
authors.affiliation: Departamento de Ciencias Químico Biológicas y Agropecuarias, División de Ciencias e Ingeniería, Unidad Regional Sur, Universidad de Sonora. Blvd. Lázaro Cárdenas No. 100, Colonia Francisco Villa, CP 85880, Navojoa, Sonora, Mexico. avirgen@navojoa.uson.mx
authors.forename: Adolfo
authors.initials: A
authors.lastname: Virgen-Ortiz
authors.forename: Alejandro
authors.initials: A
authors.lastname: Apolinar-Iribe
authors.forename: Martín E
authors.initials: ME
authors.lastname: Ríos-Martínez
authors.forename: José L
authors.initials: JL
authors.lastname: Marín
authors.forename: Jesús
authors.initials: J
authors.lastname: Muñiz
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D056966:Excitation Contraction Coupling / Q000502:physiology; D005260:Female; D066298:In Vitro Techniques; D007834:Lasers; D008297:Male; D009200:Myocardial Contraction / Q000502:physiology; D010210:Papillary Muscles / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D013314:Stress, Mechanical