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Abbreviation: pNN50
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Long Form No. Long Form Research Area Co-occurring Abbreviation PubMed/MEDLINE Info. (Year, Title)
percentage difference between adjacent NN intervals more than 50 ms
(11 times)
Cardiology
(8 times)
HF (6 times)
LF (6 times)
r-MSSD (5 times)
1994 [Effects of coronary angioplasty on heart rate variability explored in the domain of time and frequency in patients with one-vessel coronary disease].
percentage of successive normal sinus RR intervals >50 ms
(10 times)
Cardiology
(3 times)
HRV (8 times)
SDNN (6 times)
HF (5 times)
1998 Twenty-four hour time domain heart rate variability and heart rate: relations to age and gender over nine decades.
percent of adjacent RR intervals differing by >50 ms
(5 times)
Cardiology
(3 times)
HRV (4 times)
SDNN (3 times)
rMSSD (2 times)
1997 Reproducibility of time-domain indexes of heart rate variability in patients with vasovagal syncope.
proportion of intervals differing more than 50 ms
(5 times)
Neurology
(1 time)
RMSSD (5 times)
HRV (4 times)
HF (2 times)
2001 The effect of endurance training on resting heart rate variability in sedentary adult males.
percentage of adjacent NN interval differences >50 ms
(4 times)
Cardiology
(2 times)
HRV (4 times)
HF (3 times)
SDNN (3 times)
2003 An approach to measure atrial and ventricular heart rate variability using pacemaker-mediated intracardiac electrograms.
pairs of adjacent NN intervals that differ >50 ms
(2 times)
Cardiology
(1 time)
RMSSD (2 times)
SDNN (2 times)
CGI-S (1 time)
1998 Effects of verapamil on indexes of heart rate variability after acute myocardial infarction.
percentage of RR intervals with >50 ms variation
(2 times)
Cardiology
(1 time)
HRV (2 times)
RMSSD (2 times)
SDNN (2 times)
2004 Effect of nesiritide (human b-type natriuretic peptide) and dobutamine on heart rate variability in decompensated heart failure.
percentage of the R-R intervals differing more than 50 ms
(2 times)
Occupational Medicine
(1 time)
CV (1 time)
DAN (1 time)
HFP (1 time)
1993 Supine and standing sympathovagal balance in athletes and controls.
proportion of NN50 divided by the total number of NNs
(2 times)
Biomedical Research
(1 time)
RMSSD (2 times)
SDNN (2 times)
HF (1 time)
2015 The Effects of Guided Imagery on Heart Rate Variability in Simulated Spaceflight Emergency Tasks Performers.
10  proportion of RR intervals more than 50 milliseconds different
(2 times)
Cardiology
(2 times)
HRV (2 times)
SDANN (2 times)
FAP (1 time)
1993 Assessment of heart rate variability in hypertrophic cardiomyopathy. Association with clinical and prognostic features.
11  percent differences between successive RR intervals > 50 ms
(1 time)
Cardiology
(1 time)
DIMT (1 time)
1995 Heart rate variability in patients with mild to moderate heart failure: effects of neurohormonal modulation by digoxin and ibopamine. The Dutch Ibopamine Multicenter Trial (DIMT) Study Group.
12  percent exceeding 50 ms
(1 time)
Pediatrics
(1 time)
HRV (1 time)
HUT (1 time)
RMSSD (1 time)
1996 Heart rate variability and the outcome of head-up tilt in syncopal children.
13  percent of consecutive N-N intervals differing >50 milliseconds
(1 time)
Medicine
(1 time)
BP (1 time)
CON (1 time)
ESRD (1 time)
2019 Altered Autonomic Reactivity During Lower Body Negative Pressure in End-Stage Renal Disease.
14  percent of successive differences longer than 50 ms
(1 time)
Cardiology
(1 time)
CC (1 time)
CCHB (1 time)
CL (1 time)
1994 [Study of the autonomic behavior of escape rhythms in congenital atrioventricular block].
15  percent of successive NN interval differences above 50 ms
(1 time)
Medicine
(1 time)
ECG (1 time)
HRV (1 time)
PICU (1 time)
2019 Heart rate variability as a marker of recovery from critical illness in children.
16  percent of successive normal R-R greater than 50 ms
(1 time)
Cardiology
(1 time)
HF (1 time)
MMSD (1 time)
1992 [An analysis of the variability in the heart rate in relation to the presence of transient ischemia and to its physiopathological mechanism].
17  percentage number of adjacent RR intervals> 50 ms
(1 time)
Pharmacology
(1 time)
HRV (1 time)
qEEG (1 time)
2002 The effects of St John's wort extract on heart rate variability, cognitive function and quantitative EEG: a comparison with amitriptyline and placebo in healthy men.
18  percentage of adjacent cycles differing by >50 ms
(1 time)
Psychiatry
(1 time)
CCU (1 time)
HRV (1 time)
rMSNN (1 time)
2004 Worsening of depressive symptoms 6 months after an acute coronary event in older adults is associated with impairment of cardiac autonomic function.
19  percentage of adjacent intervals that varied by more than 50ms
(1 time)
Headache
(1 time)
ECG (1 time)
HF (1 time)
HRV (1 time)
2013 Autonomic dysfunction in reversible cerebral vasoconstriction syndromes.
20  percentage of adjacent N-N intervals that are >50 msec apart
(1 time)
Gastroenterology
(1 time)
HRV (1 time)
NN (1 time)
SDNN (1 time)
2006 The relationship of heart rate variability with severity and prognosis of cirrhosis.
21  percentage of adjacent R-R intervals that varied by >50ms
(1 time)
Endocrinology
(1 time)
CAN (1 time)
HRV (1 time)
LVH (1 time)
2014 Relationships between reduced heart rate variability and pre-clinical cardiovascular disease in patients with type 2 diabetes.
22  percentage of adjacent RR differences >50 ms
(1 time)
Cardiology
(1 time)
HRV (1 time)
r-MSSD (1 time)
1996 Effects of bisoprolol on heart rate variability in heart failure.
23  percentage of adjacent RR intervals >50 ms different
(1 time)
Cardiology
(1 time)
CHF (1 time)
EF (1 time)
HF (1 time)
1997 Depressed heart rate variability as an independent predictor of death in chronic congestive heart failure secondary to ischemic or idiopathic dilated cardiomyopathy.
24  percentage of consecutive N-N intervals that vary by >50 ms
(1 time)
Neurology
(1 time)
CAN (1 time)
CARTs (1 time)
HRV (1 time)
2019 Diagnostic performance of resting and post-exercise heart rate variability for detecting cardiac autonomic neuropathy in type 2 diabetes mellitus.
25  percentage of consecutive RR-interval differences greater than 50 ms
(1 time)
Biomedical Engineering
(1 time)
HRV (1 time)
RAE (1 time)
RMSSD (1 time)
2004 What is the adequate sampling interval of the ECG signal for heart rate variability analysis in the time domain?
26  percentage of difference between consecutive N-N intervals >50 ms
(1 time)
Cardiology
(1 time)
AT (1 time)
AVAT (1 time)
HF (1 time)
2005 Changes in autonomic nervous activity after catheter ablation of atrial tachycardia arising from the atrioventricular annulus.
27  percentage of differences between following RR intervals greater than 50ms
(1 time)
Traumatology
(1 time)
HF (1 time)
HRV (1 time)
LF (1 time)
2018 Autonomic nerve activity indexed using 24-h heart rate variability in patients with burns.
28  percentage of differences between successive RRIs greater than 50 ms
(1 time)
Physiology
(1 time)
HF (1 time)
HRV (1 time)
RRI (1 time)
2001 Time domain, geometrical and frequency domain analysis of cardiac vagal outflow: effects of various respiratory patterns.
29  percentage of NN intervals greater than 50 msec
(1 time)
Geriatrics
(1 time)
HF (1 time)
HRV (1 time)
LF (1 time)
2016 Physical Exercise for Late-Life Depression: Effects on Heart Rate Variability.
30  percentage of NN50
(1 time)
Medicine, Ayurvedic
(1 time)
HF (1 time)
HRV (1 time)
LF (1 time)
2012 Measurement of the effect of Isha Yoga on cardiac autonomic nervous system using short-term heart rate variability.
31  percentage of normal-to-normal 50
(1 time)
Audiology
(1 time)
HF (1 time)
HRV (1 time)
LF (1 time)
2015 Response of cardiac autonomic modulation after a single exposure to musical auditory stimulation.
32  percentage of RR intervals > 50 ms
(1 time)
Sports Medicine
(1 time)
HRV (1 time)
RMSSD (1 time)
SampEn (1 time)
2015 Heart Rate Variability: a Follow-up in Elite Soccer Players Throughout the Season.
33  percentage of successive normal-to-normal interval differences larger than 50 ms
(1 time)
Rheumatology
(1 time)
BMI (1 time)
HF (1 time)
HRV (1 time)
2012 Autonomic impairment in rheumatoid arthritis.
34  percentage of successive R-R intervals that differed by >50 ms
(1 time)
Diabetes Mellitus
(1 time)
AIx75 (1 time)
baPWV (1 time)
cfPWV (1 time)
2019 Effects Of Exercise Training With Dietary Restriction On Arterial Stiffness, Central Hemodynamic Parameters And Cardiac Autonomic Function In Obese Adolescents.
35  present differences >50 miliseconds
(1 time)
Pediatrics
(1 time)
HF (1 time)
2014 Cardiac autonomic dysfunction in obese normotensive children and adolescents.
36  proportion of differences between adjacent NN intervals that are >50 ms
(1 time)
Metabolism
(1 time)
HF (1 time)
HRV (1 time)
SDNN (1 time)
2018 CLOCK 3111T/C genetic variant influences the daily rhythm of autonomic nervous function: relevance to body weight control.
37  proportion of differences of adjacent RR intervals > 50 ms
(1 time)
Nursing
(1 time)
LF/HF (1 time)
RCT (1 time)
RMSSD (1 time)
2019 [The Effect of Exercise Training on Heart Rate Variability in Patients With Hemodialysis: A Systematic Review].
38  proportion of NN50 for total number of beats
(1 time)
Pain
(1 time)
BreEStim (1 time)
HRV (1 time)
LF (1 time)
2018 Neuropathic pain modulation after spinal cord injury by breathing-controlled electrical stimulation (BreEStim) is associated with restoration of autonomic dysfunction.
39  proportion of successive R-R intervals greater than 50 milliseconds
(1 time)
Psychiatry
(1 time)
SDNN (2 times)
HRV (1 time)
SSD (1 time)
2018 Characteristics of Autonomic Activity and Reactivity During Rest and Emotional Processing and Their Clinical Correlations in Somatic Symptom Disorder.