title: Estimation of central aortic forces in the ballistocardiogram under rest and exercise conditions.
abstract: The ballistocardiogram (BCG) signal represents the movements of the body in response to cardiac ejection of blood. The BCG signal can change considerably under various physiological states; however, little information exists in literature describing how these forces are generated. A physical analysis is presented using a finite element model of thoracic aortic vasculature to quantify forces generated by the blood flow during the cardiac cycle. The traction at the fluid-solid interface of this deformable wall model generates a Central Aortic Force (CAF) which appears of similar magnitude to recorded BCG forces. The increased pulse pressure in an exercise simulation caused a significant increase in CAF, which is consistent with recent BCG measurements in exercise recovery.
authors: Bioengineering Department, Stanford University, Stanford, CA 94305, USA. rwiard@stanford.edu
authors: Richard M
authors: RM
authors: Wiard
authors: Hyun Jin
authors: HJ
authors: Kim
authors: C
authors: C
authors: Figueroa
authors: Gregory T A
authors: GT
authors: Kovacs
authors: Charles A
authors: CA
authors: Taylor
authors: Laurent
authors: L
authors: Giovangrandi
mesh_terms: D000818:Animals; D016880:Anisotropy; D001011:Aorta / Q000502:physiology*; D001450:Ballistocardiography / Q000295:instrumentation* / Q000379:methods*; D001698:Biomedical Engineering / Q000379:methods; D002339:Carotid Arteries / Q000473:pathology; D003198:Computer Simulation; D004548:Elasticity; D004563:Electrochemistry / Q000379:methods; D004867:Equipment Design; D008962:Models, Theoretical; D010805:Physical Conditioning, Animal; D012146:Rest; D013314:Stress, Mechanical; D013552:Swine