title: Gender comparison of contractile performance and beta-adrenergic response in isolated rat cardiac trabeculae.
abstract: It is known that gender can affect susceptibility to development of various cardiomyopathies. However, it is unclear whether basic mechanical contractile function of the myocardium differs between genders, whether they respond differently to stressors, or both. To test for a possible gender factor, contractile parameters of healthy, isolated myocardium were investigated under near physiological conditions. Right ventricular ultra-thin trabeculae from young adult LBN-f1 rats were electrically stimulated to isometrically contract at 37 degrees C. No differences were found in developed force or kinetic parameters. In each muscle, the force-frequency relationship was measured at 4, 6, and 8 Hz, encompassing most of the in vivo range. Again, no differences were observed in force-frequency behavior; developed force rose from 21.6 +/- 4.0 at 4 Hz to 30.3 +/- 5.8 mN/mm(2) at 8 Hz in females and from 23.4 +/- 3.4 to 29.8 +/- 3.4 mN/mm(2 )in males. The response to beta-adrenergic stimulation was similar; at 1 microM isoproterenol, developed force increased to 34.5 +/- 6.2 mN/mm(2) in females and 32.3 +/- 3.2 mN/mm(2) in males (female vs. male, not significant). We conclude that basic mechanical performance of healthy isolated myocardium under physiological conditions is not different between males and females, and a different response to stress must underlie gender-based differences in cardiac performance.
authors.affiliation: Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, 304 Hamilton Hall, 1645 Neil Avenue, Columbus, OH, 43210-1218, USA.
authors.forename: Michelle M
authors.initials: MM
authors.lastname: Monasky
authors.forename: Kenneth D
authors.initials: KD
authors.lastname: Varian
authors.forename: Paul M L
authors.initials: PM
authors.lastname: Janssen
mesh_terms: D000318:Adrenergic beta-Agonists / Q000494:pharmacology; D000818:Animals; D004305:Dose-Response Relationship, Drug; D004558:Electric Stimulation; D005260:Female; D006352:Heart Ventricles / Q000187:drug effects; D007545:Isoproterenol / Q000494:pharmacology; D008297:Male; D009200:Myocardial Contraction / Q000187:drug effects / Q000502:physiology*; D051381:Rats; D011919:Rats, Inbred Strains; D011943:Receptors, Adrenergic, beta / Q000187:drug effects / Q000502:physiology*; D012727:Sex Characteristics; D016276:Ventricular Function
chemical_list: D000318:Adrenergic beta-Agonists; D011943:Receptors, Adrenergic, beta; D007545:Isoproterenol