autonomic regulation of heart

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• Heart rate variability — (HRV) is a measure of the beat to beat variations in heart rate. It is usually calculated by analyzing a time series of beat to beat intervals from the ECG or of beat to beat intervals derived from an arterial pressure tracing.Various measures of …   Wikipedia

• autonomic nervous system — n. the part of the nervous system that is responsible for control and regulation of the involuntary bodily functions, including those of the heart, blood vessels, visceral smooth muscles, and glands: it consists of the sympathetic system which,… …   English World dictionary

• Autonomic nervous system — Part of the nervous system that was once thought to be functionally independent of the brain. The autonomic nervous system regulates key functions of the body including the activity of the heart muscle (see below), the smooth muscles (e.g., the… …   Medical dictionary

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