Definition
HRV is defined as the changes in the time interval between successive heartbeats.
Common Uses
People are interested in HRV primarily because it is regulated by the autonomic nervous system (ANS), which also regulates heart rate and blood pressure. This means that HRV can potentially provide useful information about questions pertaining to our overall nervous system, including information about stress, rest, recovery, and immune response.[1] The two components of the ANS, the sympathetic and the parasympathetic nervous system, both influence HRV.
Measurement Approach
Since HRV measures the change over time of the interval between heart beats, there are many options available for producing a value relevant to a specific question. The heartbeat itself is not instantaneous, of course, but for the purpose of HRV measurement, the time is measured between ECG peaks known as R-R intervals. However, many people have irregular heartbeats, and so HRV is better calculated using NN intervals; that is, the time between ECG peaks when the heart is in a normal rhythm. Four common ways of determining HRV values, with their commonly used associations, are:
- Standard Deviation of NN-Interval (SDNN)
- Risk of mortality in cardiac patients
- Standard Deviation of 5-minute averages of NN-Interval (SDANN)
- Predominant circadian rhythm
- The Root Mean Square of Successive NN-Interval Differences (rMSSD)
- Vagal modulation of heart rate.
- The Percentage of NN-Intervals that Are Greater than 50ms Different than Prior NN-Interval (pNN50)
Any instrument that reliably provides continuous heart rate data can be used as a basis for calculating HRV. Of course not all instruments are equally reliable and convenient, but the suitability for HRV is determined both by the instrument quality and by the situation of measurement. Less precise instruments can be used when the measurement context is well controlled.
Tools
QS forum list of, likely deprecated, ECG devices.[2]
| Company
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Model or Series
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Release Date
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Metrics
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Sensor
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Still Produced?
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| Apple
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Watch Series 4+
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September 12, 2018
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| Fitbit
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Sense
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| Fitbit
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Versa
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Optical heart rate monitor
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| Fitbit
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Charge
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Projects
- Paul LaFontaine: “We never fight on Wednesdays”
People
References
Linked content on this wiki
(The content in the table below is automatically created. See Template:Topic Queries for details. If newly linked pages do not appear here, click on "More" and "Refresh".)
| Projects related to this topic
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| A Life Of Fractals, A Million Heartbeats, A Quest for High Fidelity Activity Tracking, A Reversed Calendar, A Year of Diabetes Data, Arterial Stiffness, Blood Oxygen On Mt. Everest, Butterfly Project: Swimming Goggles To Measure Heart Rate, Connecting my Mind and Body, Data from my iPhone ECG, ECG and Activity Monitoring: What Can We Learn?, Effect of Ketogenic Diet On Heart Rate Variability, Every Heart Beat, Experience Sampling of My Stress, Finding The Optimal Training Zone, From April Zero to Gyroscope, Heart Rate Variability and Flow, How I Measured This Talk, How I Zapped My Brain With A 9v Battery To Overcome Analysis Paralysis, How My Life Automation System Quantifies My Life, Impact of work-related stress, Improving My Blood Pressure With Anaerobic Interval Training, Learning about Biases and Gaps in my Self-Collected Data, Lessons from a year of heart rate data, Lies, Damn Lies, and Correlations, Life in the Fast Lane: Learning from Vitals, Making Sense of My Bio-signals, Measuring Exhaustion and Readiness, Measuring the Moment, My Biological Rhythms In Sickness And In Health, My Life In 40 Variables, Online Activity Aggregation, Owning My Quantified Self Data, Parkinson's Tracking Update, Personal Comfort, Playing with my Breath, Putting Numbers to Sleep, QS Adventures with my Kids, QS Tools for Military Style Training, Quantifying Motivation with a Smart Shirt, Quantifying The Effects Of Microaggressions, Quantifying with Kids, Rhythmanalysis, Sensing Breath and Air, Stressing Out Loud, The Effects of a Year in Ketosis, Three Marathons On Zero Calories, Tinké: Monitoring Fitness Levels and Relaxation Indexes, Tracking Glucose As A Person Without Diabetes, Tracking My Sleep And Resting Heart Rate... further results
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| Self researchers related to this topic
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| ErikBjare, Richard Sprague Justin Timmer, Crt Ahlin, Jamie Williams, Danielle Roberts, Doug Kanter, Renate Zwijsen, Fah Sathirapongsasuti, Hind Hobeika, Juliana Chua, David Albert, Maggie Delano, Paul LaFontaine, Gordon Bell, Ulrich Atz, Ralph Pethica, Anand Sharma, Paul LaFontaine, Bill Schuller, JD Leadam, Tahl Milburn, Gedankenstuecke, Siva Raj, Shannon Conners, Kiel Gilleade, Eric Jain, Stephen Zadig, Fu-Chieh Hsu, Philipp Kalwies, Ajay Chander, Azure Grant, Justin Timmer, Beau Gunderson, Aaron Parecki, Kevin Krejci, Stefano Schiavon, Olivier Janin, Maria Benet, Bill Schuller, Troy Angrignon, Kirill Gertman, Jordan Clark, Victor Lee, Kiel Gilleade, Erica Forzani, Steven Jonas, James McCarter, Mikey Sklar, Juliana Chua, Justin Lawler, Jakob Larsen... further results
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| We talked about this topic in the following meetings
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| 2021-09-09 Self-Research Chat, 2021-09-16 Self-Research Chat, 2021-09-30 Self-Research Chat, 2021-12-02 Self-Research Chat, 2022-01-27 Self-Research Chat, 2022-04-28 Self-Research Chat, 2022-06-16 Self-Research Chat, 2022-08-18 Self-Research Chat, 2022-09-22 Self-Research Chat, 2022-10-06 Self-Research Chat, 2022-10-13 Self-Research Chat
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