What is cardiac vagal index, cardiac sympathetic index and R-R interval in measuring autonomic nervous system activity?
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Cardiac vagal index and cardiac sympathetic index are measures used to assess autonomic nervous system activity. The cardiac vagal index quantifies the activity of the parasympathetic branch of the autonomic nervous system, which is responsible for slowing down the heart rate and promoting relaxation. It is often derived from heart rate variability (HRV) series and can provide insights into the vagal activity of the heart . On the other hand, the cardiac sympathetic index measures the activity of the sympathetic branch of the autonomic nervous system, which is responsible for increasing heart rate and preparing the body for action. It can also be derived from HRV series and provides estimates of sympathetic activity . The R-R interval, also known as the heartbeat interval, is the time between consecutive R-peaks in an electrocardiogram (ECG) waveform. It is often used as a measure of heart rate variability and can reflect changes in autonomic nervous system activity .
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09 Oct 2022 1 Citations | The provided paper does not mention the terms "cardiac vagal index" or "cardiac sympathetic index". However, the paper discusses the Sympathetic Activity Index (SAI) as a measure of sympathetic activity. The paper also mentions "heartbeat interval series" which refers to the R-R interval, the time between consecutive heartbeats. |
6 Citations | The provided paper does not mention the terms "cardiac vagal index" or "cardiac sympathetic index." However, it does mention the R-R interval, which is the time between consecutive R peaks on an electrocardiogram (ECG) waveform. The paper discusses the RZ interval as an indicator of sympathetic activity in effort-related cardiac activity. |
| The paper does not mention the terms "cardiac vagal index" or "cardiac sympathetic index." However, it does mention the "root mean square error of normalized RR-intervals (RMSDD)" as one of the markers used to measure autonomic nervous system activity. | |
09 Oct 2022 1 Citations | The provided paper does not mention the terms "cardiac vagal index" or "cardiac sympathetic index". However, the paper discusses the Sympathetic Activity Index (SAI) as a measure of sympathetic activity. The paper also mentions the "heartbeat interval series" which refers to the R-R interval, the time between consecutive heartbeats. |
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