Carotid baroreflex control of blood pressure and heart rate in men during dynamic exercise.
Carotid baroreflex control of blood pressure and heart rate in men during dynamic exercise.
复制标题
颈动脉压力反射控制男性动态运动期间的血压和心率。
DOI：
10.1152/jappl.1994.77.2.502
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
Rowell,LB
中科院分区：
文献类型：
--
作者：
Papelier,Y;Escourrou,P;Gauthier,JP;Rowell,LB
The degree of control of blood pressure (BP) and heart rate (HR) by arterial baroreflex during exercise is still controversial. We studied baroreflex control of BP and HR in seven normal young men by a noninvasive procedure employing a neck suction chamber that delivers pulsatile positive and negative pressures to the carotid sinus (CS). Pressures applied to the CS ranged from -80 to +60 Torr in steps of 20 Torr. Pressure stimuli were triggered by electrocardiogram R wave, and each pressure step was maintained for 20 s in a continuous sequence. One baroreflex-response curve was obtained during the last 3 min of each 6-min period of exercise. The four levels of upright (cycle) exercise were 60, 120, 180, and 240 W, the highest requiring approximately 75% of maximal O2 uptake. The sensitivity of the HR baroreflex response assessed by linear regression of HR vs. CS pressure (CSP) did not significantly decrease from rest (-0.09 +/- 0.053 beat/Torr) to 240 W (-0.06 +/- 0.025 beat/Torr). The BP above or below which CSP was increased or decreased by neck collar pressure was significantly increased from rest (76 +/- 6.5 Torr) to 240 W (111.2 +/- 4.0 Torr). The sensitivity of baroreflex response was assessed by linear regression of BP vs. CSP and was not significantly different from rest (-0.29 +/- 0.054 Torr/Torr) up to exercise at 240 W (-0.29 +/- 0.048 Torr/Torr). We conclude that mild to severe exercise does not reduce the gain of the CS reflex below resting values.(ABSTRACT TRUNCATED AT 250 WORDS)
