RR interval
Heart rate is the speed of the heartbeat, specifically the number of heartbeats per unit of time. The heart rate is typically expressed as beats per minute (bpm). The heart rate can vary according to the body's physical needs, including the need to absorb oxygen and excrete carbon dioxide. Activities that can provoke change include physical exercise, sleep, anxiety, stress, illness, ingesting, and drugs.
The normal resting adult human heart rate ranges from 60–100 bpm.Bradycardia is a slow heart rate, defined as below 60 bpm. Tachycardia is a fast heart rate, defined as above 100 bpm at rest. When the heart is not beating in a regular pattern, this is referred to as an arrhythmia. These abnormalities of heart rate sometimes, but not always, indicate disease.

This is an excerpt from the article RR interval from the Wikipedia free encyclopedia. A list of authors is available at Wikipedia.
The article RR interval at en.wikipedia.org was accessed 896 times in the last 30 days. (as of: 07/04/2014)
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Heart rate variability - Wikipedia, the free encyclopedia
It is measured by the variation in the beat-to-beat interval. Other terms used include: "cycle length variability", "RR variability" (where R is a point corresponding ...
en.wikipedia.org/wiki/Heart_rate_variability
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RR Intervals, Heart Rate, and HRV Howto - PhysioNet
George B. Moody Harvard-MIT Division of Health Sciences and Technology. This mini-tutorial offers a brief overview of how to obtain inter-beat (RR) interval and ...
www.physionet.org/tutorials/hrv/
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RR - Wikipedia, the free encyclopedia
en.wikipedia.org/wiki/RR
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ECG Primer: Calculations
QT interval*, Total duration of ventricular depolarization (all myocytes), up to 0.43 sec (must be corrected for heart rate). R-R interval (heart rate)*, Time between ...
courses.kcumb.edu/physio/ecg%20primer/normecgcalcs.htm
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RR interval - Medical Dictionary - The Free Dictionary
the interval from the peak of one QRS complex to the peak of the next as shown on an electrocardiogram. It is used to assess the ventricular rate. See also ...
medical-dictionary.thefreedictionary.com/R-R+interval
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Altered Complexity and Correlation Properties of R-R Interval ...
Twenty-minute R-R interval data were then divided into 2 segments of equal size according to their beat count; a linear detrend was applied to those segments ...
circ.ahajournals.org/content/100/20/2079.full
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Mechanisms Underlying Very-Low-Frequency RR-Interval ...
Abstract. Background—Survival of post–myocardial infarction patients is related inversely to their levels of very-low-frequency (0.003 to 0.03 Hz) RR-interval ...
circ.ahajournals.org/content/98/6/547.long
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Intervals
Intervals. An interval is a portion of the baseline and at least one wave. We measure ... Figure 27: The QT interval is greater than half the preceding RR interval.
www.fammed.wisc.edu/medstudent/pcc/ecg/intervals.html
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RR Interval Variability Is Inversely Related to Inflammatory Markers ...
Here we measured RR interval variability, an index of cardiac vagal modulation, and CRP and IL-6 in 757 subjects participating in a subset of the year 15 data ...
www.ncbi.nlm.nih.gov/pmc/articles/PMC1892756/
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QT interval - Life in the Fast Lane
QT interval. ... The QT interval is the time from the start of the Q wave to the end of the T ... The RR interval is given in seconds (RR interval = 60 / heart rate).
lifeinthefastlane.com/ecg-library/basics/qt_interval/
Search results for "RR interval"
RR interval in science
Altered Complexity and Correlation Properties of R-R Interval ...
Conclusions—A decrease in the complexity of R-R intervals and altered ... and who were studied at Tampere and Oulu University hospitals in Finland were ...
[PDF]RR interval variation, the QT interval index and risk of primary ...
University of Washington, Seattle; 4Department of Biostatistics, University of Michigan, Ann Arbor; ... Aims Autonomic tone influences RR interval variation.
RR-interval irregularity precedes ventricular fibrillation in ST ...
Heart Rhythm, Volume 7, Issue 1, Pages 65-71, January 2010, Authors:Miguel E. Lemmert, MD; Mohamed Majidi, MD; Mitchell W. Krucoff, MD; Sebastiaan ...
Dynamical system approach to heart rate variability: QT versus RR ...
Dec 16, 2010 ... It is hypothesized that the Erlang distribution of the RR interval is a ... Part of collection, University of Southern California dissertations and ...
Intervals
Intervals. An interval is a portion of the baseline and at least one wave. We measure an interval on the horizontal axis in seconds. The PR, QRS, and QT are the ...
EKG Interpretive skills
Count the number of RR intervals between two Tick marks (6 seconds) in the rhythm strip and multiply by 10 to get the bpm. This method is more effective when ...
Comparison of Polar 810s and an ambulatory ECG system for RR ...
Department of Sports Science, University of Wales, Swansea, UK. ... Simultaneous recording of the ECG (Reynolds Pathfinder), RR interval (Polar), and ...
RR Interval Variability Is Inversely Related to Inflammatory Markers ...
7 Department of Medicine, Northwestern University, Chicago IL ... Here we measured RR interval variability, an index of cardiac vagal modulation, and CRP and ...
ECG Primer: Calculations - Kansas City University of Medicine and ...
QT interval*, Total duration of ventricular depolarization (all myocytes), up to 0.43 sec (must be corrected for heart rate). R-R interval (heart rate)*, Time between ...
Can you use S-S intervals instead of R-R intervals for HRV (heart ...
Jul 9, 2013 ... As the rhythm is supposedly sinus rhythm, the 'R-R' interval actually refers to ... Hoang ChuDuc · Hanoi University of Science and Technology.
Books on the term RR interval
Cardiovascular MRI: Physical Principles to Practical Protocols
Vivian S. Lee, 2006
f- R-R interval I TABLE 1111-1 Heart Rates (Beats per Minute) and Corresponding R-R Intervals (msec) Q FIGURE 1111 -1. Schematic diagram of standard electrocardiogram (ECG). Heart Rate and R-R Interval The heart rate can be ...
Design and Analysis of Gauge R&R Studies: Making Decisions with Confidence Intervals in Random and Mixed Anova...
Richard K. Burdick, 2005
This book provides a protocol for conducting gauge repeatability and reproducibility (R&R) experiments. Such an experiment is required whenever a new test system is developed to monitor a manufacturing process. The protocol presented here is used to determine if the testing system is capable of monitoring the manufacturing process with the desi...
Heart Rate Determination with RR and PP Interval Time Series: With MIT/BIH and Fantasia Database
2012
Hello readers. I am from J&K (INDIA). I did B.E from Govt. College of Engineering & technology (University of JAMMU) and M.Tech from Dr. B.R Ambedkar National Institute of Technology Jalandhar. Presently, I am working as a Lecturer in ECE dept in MIET kot bhalwal Jammu. I dedicate this publication solely to my parents and teachers.
A Normal-mixture Model with Random-effects for RR-interval Data
Jessica McKinney Ketchum, 2006
A simulation study is performed to examine the properties of the random-effects model with normal-mixture distribution and the estimation of the parameters using the EM-algorithm.
Step-Up to Medicine (Step-Up Series)
2012
Step-Up to Medicine is your lifeline for the clinical years of medical school. This book was originally written by third-year medical students searching for the perfect review book—not finding it on the market, they wrote it themselves! Now in its third edition, Step-Up to Medicine boils down the full scope of tested pathology in a single ingenious...
Basic and Bedside Electrocardiography
Romulo F. Baltazar, 2012
^T QT interval (in seconds) QTc = - ^j R-R interval (in seconds) - R-R Interval * Figure 2.8: The QT Interval. The QT interval is measured from the beginning of the QRS complex to the end of the T wave. When the heart rate is >70 bpm,one ...
Pocket Medicine: The Massachusetts General Hospital Handbook of Internal Medicine (Pocket Notebook Series)
2010
Prepared by residents and attending physicians at Massachusetts General Hospital, this pocket-sized looseleaf is one of the best-selling references for medical students, interns, and residents on the wards and candidates reviewing for internal medicine board exams. In bulleted lists, tables, and algorithms, Pocket Medicine provides key clinical inf...
Neuromuscular Function and Disease: Basic, Clinical, and ...
William Frederick Brown, Charles Francis Bolton, Michael Jeffrey Aminoff, 2002
After lying down, there is a decrease in the R-R interval that is maximal around the third or fourth beat, which is followed by an increase in the R-R interval value (greater than the resting value) at approximately the 25th to 30th beat. Autonomic  ...
The Harriet Lane Handbook: Mobile Medicine Series, Expert Consult: Online and Print, 19e
2011
Trusted by generations of residents and practitioners, The Harriet Lane Handbook from The Johns Hopkins University remains your first choice for fast, accurate information on pediatric diagnosis and treatment. Now even more convenient to carry, it's your go-to resource for a wealth of practical information, including the latest treatment and m...

Blog posts on the term
RR interval
Using LabVIEW for Heart Rate Variability Analysis - National Instruments
Heart rate variability (HRV) analysis is an important application with many research and clinical uses. LabVIEW includes many signal processing VIs that make it convenient for user...
www.ni.com/example/30832/en/
HRV in a bit more detail: Part 2 | HRVtraining
Part 1 of this series provided information on heart function, ECG basics, HRV basics and how the Autonomic nervous system influences heart rate. For Part 2, I’ll discuss and display basic HRV analysis concepts to try and enhance your understanding of HRV. I’ll relate as much of this discussion as possible to smart-phone based HRV…
hrvtraining.com/2013/11/22/hrv-in-a-bit-more-detail-part-2/
December Research Round-Up: the HRV Edition | Bret Contreras
Every month, Chris and I write the monthly Strength and Conditioning Research review service. The December edition comes out in a few days and the overall theme is Heart Rate Variability (HRV).
bretcontreras.com/hrv/
ECG of the Week: ECG of the Week - 28th October 2013 - Interpretation
This ECG is from a 35 yr old male who presented to the Emergency Department complaining of palpitations, dysponea, and light-headedness for the preceding hour. He has no known past medical history.
jhcedecg.blogspot.com/2013/10/ecg-of-week-28th-october-2013_30.html
OpenHeart: 59-Year-Old Woman With Diverticulitis
This week's case is a 59-year-old woman who presents with acute left sided lower quadrant abdominal pain, nausea, vomiting and fever. A diagnosis of acute diverticulitis is made.
openheart.circulationjournal.org/2013/07/july-16-2013-ecg-challenge.html
BioMedical Engineering OnLine | Full text | Open source model for generating RR intervals in atrial fibrillation and beyond
Realistic modeling of cardiac inter-beat (RR) intervals is highly desirable for basic research in cardiac electrophysiology, clinical management of heart diseases, and developing signal processing tools for ECG analysis.
www.biomedical-engineering-online.com/content/6/1/9
Are You Overtraining? Two Scientifically Proven Methods to Test Yourself - Method 1: Heart Rate Variability Analyses - SuppVersity: Nutrition and Exercise Science for Everyone
Overtraining, its existence, consequences and detection is always a matter of debate within the fitness community. While some claim that it does not even exist, others fear it so much that they constantly undertrain. The result? They cannot accomplish their goal. Read today's SuppVersity article and learn about a simple and effective way to monitor your training status and optimize your success: Heart rate variability monitoring.
suppversity.blogspot.com/2013/12/are-you-overtraining-two-scientifically.html
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