醫學六：80題 ( 包括麻醉科,眼科,耳鼻喉科,婦產科,復健科等科目及其及相關臨床實例與醫學倫理 )題庫下載題庫

After exercise, without the muscular activity to increase venous return, cardiac filling may decrease dramatically because of the reduction in left ventricular end-diastolic volume and stroke volume. Circulating catecholamines and forceful ventricular contractions against a diminished ventricular volume are postulated to stimulate ventricular mechanoreceptors excessively. Afferent vagal C-fibers subsequently transmit these signals to the central nervous system with efferent reflexes, resulting in vasodilation and bradycardia, and leading to hypotension and syncope.

(https://www.aafp.org/afp/1...

After exercise, without the muscular activity to increase venous return, cardiac filling may decrease dramatically because of the reduction in left ventricular end-diastolic volume and stroke volume. Circulating catecholamines and forceful ventricular contractions against a diminished ventricular volume are postulated to stimulate ventricular mechanoreceptors excessively. Afferent vagal C-fibers subsequently transmit these signals to the central nervous system with efferent reflexes, resulting in vasodilation and bradycardia, and leading to hypotension and syncope.

(https://www.aafp.org/afp/1999/1101/p2001.html)