Open Access

ARTICLE

The Analysis of Wall Shear Stress Modulated by Acute Exercise in the Human Common Carotid Artery with an Elastic Tube Model

by Yanxia Wang¹, Yu Wang², Siqi Li³, ur Rehman Aziz³, Shutian Liu¹, Kairong Qin²

1 Department of Engineering Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, No. 2, Linggong Road, Dalian, 116024, China.
2 School of Optoelectronic Engineering and Instrumentation Science, Dal ian University of Technology, No. 2, Linggong Road, Dalian, 116024, China.
3 School of Biomedical Engineering, Dalian University of Technology, No. 2, Linggong Road, Dalian, 116024, China.

*Corresponding Author: Kairong Qin. Email: .

(This article belongs to the Special Issue: Innovations and Current Trends in Computational Cardiovascular Modeling: Molecular, Cellular, Tissue and Organ Biomechanics with Clinical Applications)

Computer Modeling in Engineering & Sciences 2018, 116(2), 127-147. https://doi.org/10.31614/cmes.2018.03985

Abstract

Assessment of the magnitude and pattern of wall shear stress (WSS) in vivo is the prerequisite for studying the quantitative relationship between exercise-induced WSS and arterial endothelial function. In the previous studies, the calculation of the WSS modulated by exercise training was primarily based upon the rigid tube model, which did not take non-linear effects of vessel elastic deformation into consideration. In this study, with an elastic tube model, we estimated the effect of a bout of 30-minute acute cycling exercise on the WSS and the flow rate in the common carotid artery according to the measured inner diameter, center-line blood flow velocity, heart rates and the brachial blood pressures before and after exercise training. Furthermore, the roles of exercise-induced arterial diameter and blood flow rate in the change of WSS were also determined. The numerical results demonstrate that acute exercise significantly increases the magnitudes of blood flow rate and WSS. Moreover, the vessel elastic deformation is a non-negligible factor in the calculation of the WSS induced by exercise, which generates greater effects on the minimum WSS than the maximum WSS. Additionally, the contributions of exercise-induced variations in blood flow rate and diameter are almost identical in the change of the mean WSS.

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Keywords

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