压力反射
医学
心率
颈动脉窦
反射
血压
麻醉
心脏病学
最大VO2
平均动脉压
内科学
作者
Jon W. Williamson,Peter B. Raven
出处
期刊:Medicine and Science in Sports and Exercise
[Ovid Technologies (Wolters Kluwer)]
日期:1994-02-01
卷期号:26 (2): 217-223
被引量:10
标识
DOI:10.1249/00005768-199402000-00012
摘要
To determine effects of aerobic exercise training on individual contributions of the right and left carotid sinus baroreflex control of the cardiac interval, heart rate [expressed as R-R Interval (RRI)] and mean arterial pressure (MAP) responses were elicited by pulsed trains of neck suction and pressure in exercise trained (ET = 8) and untrained (UT = 8) men. ET subjects had a greater (mean ± SD) maximal oxygen uptake (VO2max) than UT subjects (ET = 64.5 ± 2.4 ml. kg.min−1 vs UT = 39.8 ± 3.7 ml.kg.min−1; P < 0.001). A neck collar device was modified for delivery of suction and pressure pulses to only one side of the neck. Carotidcardiac gains for right, left, and bilateral baroreflexes were determined from the logistic function of RRI responses to changes in estimated carotid sinus pressure (ECSP). There were no significant differences in the maximal gains for bilateral (ET = 6.4 ± 1.8 vs UT = 5.9 ± 1.3 ms.mm Hg−1 ECSP), right sided (ET = 5.3 ± 1.2 vs UT = 4.5 ± 1.2 ms.mm Hg−1 ECSP) or left sided (ET = 3.3 ± 1.8 vs UT = 3.6 ± 1.8 ms.mm Hg−1 ECSP) responses between groups and both groups demonstrated an inhibitory summation of reflexes. We suggest that right and left carotid-cardiac responses, as well as the summation of these reflexes, are quantitatively similar in exercise trained and untrained subjects.
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