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Do you have hypertension? - are you monitoring frequently? - are you taking prescription drugs? - are you aware of drug side effects on ANS? - self-improvement tips Read more...... |
Feeling dizzy or even fainted? - are you low in blood pressure or heart rate? - are you taking prescription drugs? - You may experience Baroreflex failure Read more...... |
Irregular heartbeats? - often noticing abnormal heartbeats (missing, uneven, or super-fast)? - Yo might have cardiac arrhythmias - Most sudden death events are preceded by irregular heartbeats Read more...... |
Mitral Valve Prolapse? - Mitral valve is the bicuspid valve between left atrium and ventricle - If mitral valve is not closed properly (called mitral valve prolapse MVP), the blood may backflow during pumping - there is a strong connection between panic attackes and MVP - How to detect it? Read more...... |
Am I having dysautonimia? - autonomic nervous system works to fine tune body conditions depending on physiological needs - ANS consists of two branches: sympathetic and parasympathetic - do you have balanced ANS? - what are the symptoms of dysautonomia? Read more...... |
What is Heart Rate Variability (HRV)? |
Glimpse of Facts on HRV
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More facts about HRV |
A good heart: fast and slow beats alternating!
Reference (1) Hon EH, Lee ST. Electronic evaluations of the fetal heart rate patterns preceding fetal death: further observations. Am J Obstet Gynecol. 1965;87:814-826 (2) Sayers BM. Analysis of heart rate variability. Ergonomics. 1973;16:17-32 |
Figure 2: Illustration of Heart Rate Variability |
Note: Faster heart rates (with narrower gaps, indicated by a "Narrow" arrow) are stimulated by sympathetic nerve signals, while slower heart rates (with wider gaps, indicated by a "Wide" arrow) are stimulated by parasympathetic nerve signals. |
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HRV - the Golden Standard of Autonomic Nervous System Testing |
Power Spectrum Analysis of HRV - to obtain LF, HF, and LF/HF 1. Obtain peak-to-peak intervals 2. Conduct Fast Fourier Transfer (FFT) analysis 3. Plot power spectrum density distribution |
Power Spectrum Analysis of HRV - to obtain LF, HF, and LF/HF
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1996 HRV International Task Force Standard
****Be aware: Some older and current HRV analyzers do not conform to the 1996 international standard |
Figure 1: HRV-Sex-Age Correlations (Normal Values) |
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