منابع مشابه
Autoregulation and heart rate.
A utoregulation is an important physiological mechanism whereby blood flow to an organ is kept relatively constant as perfusing pressure changes. For all organs except the heart, autoregulation can be examined by changing aortic pressure and measuring the resulting organ flow. In the left ventricle, however, changing aortic pressure alters myocardial oxygen consumption, which itself alters myoc...
متن کاملHomeometric autoregulation in the heart.
THE PROPER understanding of the integrated function of an organism is predicated, at least in part, on understanding the function of its component organs. A determination of the extent to which an organ makes intrinsic readjustments to varying conditions, i.e., autoregulates, is a necessary, precursor to any precise analysis of the effects of extrinsic influences. The term autoregulation will b...
متن کاملAssociations Between Resting Heart Rate and Antisocial Behavior
Studies testing the relationship between autonomic nervous system function as indexed by low resting heart rate and antisocial behavior have found that low resting heart rate is positively correlated with a wide range of antisocial behavior measures. The aim of this review was to assess the influence of heart rate (HR) level and HR variability (HRV) on the relationship between behavioral variab...
متن کاملCircadian rhythm of heart rate and heart rate variability.
BACKGROUND Measurements of heart rate variability (HRV) are increasingly used as markers of cardiac autonomic activity. AIM To examine circadian variation in heart rate and HRV in children. SUBJECTS A total of 57 healthy infants and children, aged 2 months to 15 years, underwent ambulatory 24 hour Holter recording. Monitoring was also performed on five teenagers with diabetes mellitus and s...
متن کاملHeart rate variability and heart rate recovery as prognostic factors
BACKGROUND AND AIM Heart rate (HR) can appear static and regular at rest, during exercise or recovery after exercise. However, HR is constantly adjusted due to factors such as breathing, blood pressure control, thermoregulation and the renin-angiotensin system, leading to a more dynamic response that can be quantified using HRV (heart rate variability). HRV is defined as the deviation in time b...
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ژورنال
عنوان ژورنال: Circulation
سال: 1990
ISSN: 0009-7322,1524-4539
DOI: 10.1161/01.cir.82.5.1880