FILE: HRV · OPENED JUL 9 2026 · REV 2 LIVE FILE

HRV Research Desk

What the evidence shows about HRV, recovery, tracker accuracy, and the neuroticism link — rated by strength of evidence, updated as new studies publish.

HRV hub Evidence files: RHR·Sleep·VO2 Max·Wearable ECG·CGM·Recovery·Activity·Blood Oxygen·Respiratory Rate·Stress·Temperature

Does heart rate variability reflect autonomic function and predict health outcomes?

KnowYourPrime evidence rating Established Strong, consistent evidence supports the claim.

Higher heart rate variability reflects better autonomic function and recovery, and lower HRV is associated with worse health outcomes.

Systematic-review or meta-analytic evidence affirms the core relationship.
Multiple supporting studies are consistent with the core relationship.

What would change this rating

A new core-hitting conflicting study, a retraction of an anchor, or a failed replication would lower this rating.

57 studies scored · 7 anchor · 48 supporting · 2 null-result · Last reviewed Sep 4, 2026

Do consumer wearables measure HRV accurately compared to an ECG reference?

KnowYourPrime evidence rating Uncertain Evidence is conflicting, inconsistent, or difficult to interpret.

Consumer wearables measure HRV accurately enough to be meaningful for everyday users.

Systematic-review or meta-analytic evidence affirms the core relationship.
Multiple supporting studies are consistent with the core relationship.
An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.
A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute.
Some evidence conflicts on secondary points that do not change the core direction.

27 studies scored · 7 anchor · 18 supporting · 2 conflicting · Last reviewed Sep 4, 2026

Is trait neuroticism associated with lower heart rate variability?

KnowYourPrime evidence rating Emerging Evidence currently favors the claim, but more confirmation is needed.

Higher trait neuroticism is associated with lower heart rate variability.

Anchor-grade evidence affirms the core relationship.
Multiple supporting studies are consistent with the core relationship.
An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.
The claim rests on a single anchor whose finding affirms it; a second independent affirming anchor is needed to reach Established.
Null-result evidence bears directly on the claimed effect.

8 studies scored · 2 anchor · 5 supporting · 1 null-result · Last reviewed Sep 4, 2026

Studies in Pool90

Claims Rated3

Last PubMed SyncSep 4, 2026

Next Scheduled ReviewSep 11, 2026

6 systematic reviews 4 RCTs 56 observational 3 validity studies 21 other

MAINTAINED BY The KnowYourPrime Research Desk · reviewed against new evidence on a rolling basis

Evidence for: Higher heart rate variability reflects better autonomic function and recovery, and lower HRV is associated with worse health outcomes.

57 scored

Anchor Studies7

Heart Rate Variability and Risk of All-Cause Death and Cardiovascular Events in Patients With Cardiovascular Disease: A Meta-Analysis of Cohort Studies.

Journal

Biological research for nursing · 2020

PMID

31558032

RCR

16.3

Citations

213

Study type

Meta-analysis

Sample size

n = 28

cardiovascular diseasescause of death

The relationship of autonomic imbalance, heart rate variability and cardiovascular disease risk factors.

Journal

International journal of cardiology · 2010

PMID

19910061

RCR

56.1

Citations

1,571

Study type

Review

Sample size

[ not stated in the abstract ]

age factorsautonomic nervous system

Fractal analysis of heart rate variability as a predictor of mortality: A systematic review and meta-analysis.

Journal

Chaos (Woodbury, N.Y.) · 2018

PMID

30070502

RCR

2.6

Citations

Study type

Meta-analysis

Sample size

[ not stated in the abstract ]

cardiovascular diseasesfractals

Determinants of heart rate variability.

Journal

Journal of the American College of Cardiology · 1996

PMID

8917269

RCR

9.9

Citations

257

Study type

Primary study

Sample size

[ not stated in the abstract ]

adultelectrocardiography, ambulatory

Determinants of heart rate variability in the general population: The Lifelines Cohort Study.

Journal

Heart rhythm · 2019

PMID

29753022

RCR

3.8

Citations

Study type

Primary study

Sample size

n = 149,205

adolescentadult

Differential associations of resting heart rate and heart rate variability indices with cardiovascular and coronary heart disease mortality risk: the prospective KORA study.

Journal

Scientific reports · 2026

PMID

42618690

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansheart rate

Altered heart rate variability is associated with all-cause mortality in patients with co-morbid insomnia and obstructive sleep apnea.

Journal

Sleep · 2026

PMID

42315121

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humanssleep apnea, obstructive

Supporting Studies48

Heart rate variability as predictive factor for sudden cardiac death.

Journal

Aging · 2019

PMID

29476045

RCR

11.7

Citations

199

Study type

Review

Sample size

[ not stated in the abstract ]

asymptomatic diseasesdeath, sudden, cardiac

Heart rate variability: a review.

Journal

Medical & biological engineering & computing · 2007

PMID

17111118

RCR

46.9

Citations

1,350

Study type

Review

Sample size

[ not stated in the abstract ]

alcohol drinkingarrhythmias, cardiac

Heart rate variability today.

Journal

Progress in cardiovascular diseases · 2013

PMID

23217437

RCR

12.7

Citations

305

Study type

Review

Sample size

[ not stated in the abstract ]

autonomic nervous systemcardiac resynchronization therapy

Heart rate variability.

Journal

Handbook of clinical neurology · 2014

PMID

24095141

RCR

10.0

Citations

221

Study type

Review

Sample size

[ not stated in the abstract ]

animalsautonomic nervous system

Heart rate variability in health and disease.

Journal

Scandinavian journal of work, environment & health · 1995

PMID

7618063

RCR

4.5

Citations

105

Study type

Review

Sample size

[ not stated in the abstract ]

arrhythmias, cardiaccircadian rhythm

Heart rate variability. Frequency domain analysis.

Journal

Cardiology clinics · 1992

PMID

1504981

RCR

7.3

Citations

164

Study type

Review

Sample size

[ not stated in the abstract ]

agingautonomic nervous system diseases

Heart rate variability and autonomic activity at rest and during exercise in various physiological conditions.

Journal

European journal of applied physiology · 2004

PMID

13680241

RCR

9.4

Citations

279

Study type

Review

Sample size

[ not stated in the abstract ]

altitudeautonomic nervous system

Interaction between heart rate and heart rate variability.

Journal

Annals of noninvasive electrocardiology : the official journal of the International Society for Holter and Noninvasive Electrocardiology, Inc · 2014

PMID

24602150

RCR

7.3

Citations

148

Study type

Review

Sample size

[ not stated in the abstract ]

autonomic nervous systemcardiovascular diseases

Resting Heart Rate Variability Measured by Consumer Wearables and Its Associations with Diverse Health Domains in Five Longitudinal Studies.

Journal

Sensors (Basel, Switzerland) · 2025

PMID

41374522

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansheart rate

Associations Between Daily Heart Rate Variability and Self-Reported Wellness: A 14-Day Observational Study in Healthy Adults.

Journal

Sensors (Basel, Switzerland) · 2025

PMID

40732543

Citations

Study type

Observational study

Sample size

41 participants

humansheart rate

Heart rate variability coefficient of variation during sleep as a digital biomarker that reflects behavior and varies by age and sex.

Journal

American journal of physiology. Heart and circulatory physiology · 2026

PMID

41309064

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansmale

Heart rate variability over the decades: a scoping review.

Journal

PeerJ · 2025

PMID

40321810

RCR

4.4

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

humansheart rate

Heart Rate Variability Applications in Medical Specialties: A Narrative Review.

Journal

Applied psychophysiology and biofeedback · 2025

PMID

40293647

RCR

3.8

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

humansheart rate

State Anxiety and Nonlinear Dynamics of Heart Rate Variability in Students.

Journal

PloS one · 2016

PMID

26807793

RCR

3.4

Citations

Study type

Comparative study

Sample size

[ not stated in the abstract ]

anthropometryanxiety

Heart rate variability as a biomarker for transdiagnostic depressive and anxiety symptom trajectory in adolescents and young adults.

Journal

Journal of psychopathology and clinical science · 2024

PMID

39480332

RCR

1.7

Citations

Study type

Primary study

Sample size

n = 362

humansadolescent

The Association between Neuroticism and Heart Rate Variability Is Not Fully Explained by Cardiovascular Disease and Depression.

Journal

PloS one · 2016

PMID

25951236

RCR

0.8

Citations

Study type

Primary study

Sample size

n = 1,255

adultanxiety disorders

Your partner makes a difference. Affective touch delivered by the romantic partner improves affective state but not physiological state.

Journal

International journal of psychophysiology : official journal of the International Organization of Psychophysiology · 2026

PMID

42520858

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansmale

New insights in heart rate variability through non-linear methods for conditioning assessment in horses.

Journal

Veterinary journal (London, England : 1997) · 2026

PMID

42203068

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

animalshorses

Heart rate variability (HRV) and posttraumatic stress disorder (PTSD): a pilot study.

Journal

Applied psychophysiology and biofeedback · 2011

PMID

20680439

RCR

7.3

Citations

178

Study type

Primary study

Sample size

[ not stated in the abstract ]

adultarousal

The Role of Heart Rate Variability in Mindfulness-Based Pain Relief.

Journal

The journal of pain · 2021

PMID

31377215

RCR

4.4

Citations

Study type

Randomized controlled trial

Sample size

[ not stated in the abstract ]

adolescentadult

Effects of stress management interventions on heart rate variability in adults with cardiovascular disease: a systematic review and meta-analysis.

Journal

Journal of behavioral medicine · 2024

PMID

38478157

RCR

2.3

Citations

Study type

Meta-analysis

Sample size

[ not stated in the abstract ]

humansheart rate

Heart rate variability in acute psychosis.

Journal

Psychophysiology · 2004

PMID

14696725

RCR

2.5

Citations

Study type

Clinical trial

Sample size

[ not stated in the abstract ]

acute diseaseadolescent

Heart rate variability predicts alcohol craving in alcohol dependent outpatients: further evidence for HRV as a psychophysiological marker of self-regulation.

Journal

Drug and alcohol dependence · 2014

PMID

23601925

RCR

3.0

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

adultaged

Infant emotion regulation in the context of stress: Effects of heart rate variability and temperament.

Journal

Stress and health : journal of the International Society for the Investigation of Stress · 2024

PMID

38268180

RCR

1.3

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humanstemperament

Heart rate variability, but not heart rate, is associated with handgrip strength and mortality in older Africans at very low cardiovascular risk: A population-based study.

Journal

International journal of cardiology · 2016

PMID

25863303

RCR

1.2

Citations

Sample size

[ not stated in the abstract ]

agedcardiovascular diseases

Heart rate variability in epilepsy and its association with disease duration: a retrospective case-control study.

Journal

Frontiers in neurology · 2026

PMID

42609212

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansfemale

Smartwatch-derived exercise metrics as predictors of early hypertension: a prospective observational study.

Journal

BMC cardiovascular disorders · 2026

PMID

42252402

Citations

Study type

Observational study

Sample size

[ not stated in the abstract ]

humansprospective studies

Heart rate variability and emotion regulation: Multiethnic differences in reappraisal and suppression.

Journal

Emotion (Washington, D.C.) · 2026

PMID

41801708

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

femalehumans

A pattern-based heart rate variability approach in somatic symptom disorder: Evidence from the SOMA.SSD study.

Journal

Journal of psychosomatic research · 2026

PMID

42302632

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansheart rate

Heart Rate Variability and Blood Pressure Response to Low-Intensity Endurance Exercise Training Plus Blood Flow Restriction in Individuals with Mild Hypertension: A Randomized Controlled Clinical Trial.

Journal

Iranian journal of medical sciences · 2025

PMID

41262323

Citations

Study type

Randomized controlled trial

Sample size

[ not stated in the abstract ]

humansheart rate

Arrhythmia, heart rate variability, and antiepileptic drugs.

Journal

Epilepsia · 2010

PMID

19909327

RCR

2.9

Citations

Study type

Comparative study

Sample size

[ not stated in the abstract ]

adultaged

Clinical applicability of heart rate variability analysis by methods based on nonlinear dynamics.

Journal

Cardiac electrophysiology review · 2003

PMID

12114847

RCR

2.1

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

autonomic nervous systemelectrocardiography, ambulatory

Heart rate variability analysis in patients with multiple sclerosis.

Journal

Multiple sclerosis and related disorders · 2018

PMID

29957350

RCR

1.8

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

adultautonomic nervous system diseases

Genetic influences on heart rate variability.

Journal

International journal of psychophysiology : official journal of the International Organization of Psychophysiology · 2017

PMID

27114045

RCR

1.6

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

electrocardiographyelectroencephalography

Overnight Heart Rate Variability During Sleep Disturbance In Peri- And Postmenopausal Women.

Journal

Behavioral sleep medicine · 2025

PMID

37671829

RCR

0.7

Citations

Study type

Randomized controlled trial

Sample size

[ not stated in the abstract ]

humansfemale

Identifying high-risk post-infarction patients by autonomic testing - Below the tip of the iceberg.

Journal

International journal of cardiology · 2018

PMID

28343763

RCR

0.5

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

autonomic nervous system diseasesdefibrillators, implantable

Nighttime heart rate variability, overnight urinary norepinephrine, and glycemic status in apparently healthy human adults.

Journal

International journal of cardiology · 2014

PMID

23651814

RCR

0.5

Citations

Sample size

[ not stated in the abstract ]

blood glucosecircadian rhythm

Heart-rate variability in sleep and wakefulness.

Journal

Cardiology · 1971

PMID

4326041

RCR

0.4

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

adultarousal

Heart rate variability in healthy subjects: effect of age and derivation of normal ranges for tests of autonomic function.

Journal

British heart journal · 1987

PMID

3801254

RCR

0.3

Citations

Sample size

[ not stated in the abstract ]

age factorsheart function tests

[title unavailable]

Sample size

[ not stated in the abstract ]

Heart rate variability and sleep.

Journal

Circulation · 1996

PMID

8653852

RCR

0.1

Citations

Sample size

[ not stated in the abstract ]

circadian rhythmheart diseases

Indicators of heart rate variability, urinary norepinephrine and plasma lipid levels in healthy adults.

Journal

International journal of cardiology · 2014

PMID

23871333

RCR

0.0

Citations

Sample size

[ not stated in the abstract ]

cholesterolcircadian rhythm

TSH index and 24-hour mean heart rate in euthyroid adults: opposing FT3 and heart rate variability components.

Journal

Frontiers in endocrinology · 2026

PMID

42620477

Citations

Study type

Observational study

Sample size

[ not stated in the abstract ]

humansheart rate

Sex differences in regulatory mechanisms of the cardiovascular system during simulated hypokinesia.

Journal

Life sciences in space research · 2026

PMID

42601152

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansmale

Heart rate variability as a predictor of mortality in patients with AA and AL amyloidosis.

Journal

European heart journal · 2002

PMID

11785998

RCR

0.9

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

adultaged

Heart Rate Variability Predicts Major Adverse Cardiovascular Events and Hospitalization in Maintenance Hemodialysis Patients.

Journal

Kidney & blood pressure research · 2018

PMID

28315879

RCR

1.1

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

agedcardiovascular diseases

Role of Heart Rate Variability in Association Between Glomerular Hyperfiltration and All-Cause Mortality.

Journal

Journal of the American Heart Association · 2022

PMID

34889105

RCR

0.8

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

agedaged, 80 and over

Impedance cardiography and heart rate variability for long-term cardiovascular outcome prediction after myocardial infarction.

Journal

Medicina (Kaunas, Lithuania) · 2013

PMID

23032907

RCR

0.4

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

agedcardiography, impedance

Null-Result Studies2

Disconnection Between Self-Reported Wellbeing and Heart Rate Variability from Wearables.

Journal

Sensors (Basel, Switzerland) · 2026

PMID

41755264

Citations

Study type

Primary study

Sample size

n = 21

Bears on

Secondary point

humansheart rate

Theories of Arousal Predict a Link Between Heart Rate Variability and Reactive Aggression: Meta-Analytic Results Disagree.

Journal

Aggressive behavior · 2024

PMID

39513333

RCR

0.7

Citations

Study type

Meta-analysis

Sample size

[ not stated in the abstract ]

Bears on

Secondary point

humansaggression

Evidence for: Consumer wearables measure HRV accurately enough to be meaningful for everyday users.

27 scored

Anchor Studies7

The Validity of Apple Watch Series 9 and Ultra 2 for Serial Measurements of Heart Rate Variability and Resting Heart Rate.

Journal

Sensors (Basel, Switzerland) · 2024

PMID

39409260

RCR

5.9

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansheart rate

Validation of nocturnal resting heart rate and heart rate variability in consumer wearables.

Journal

Physiological reports · 2025

PMID

40834291

RCR

3.5

Citations

Study type

Validity study

Sample size

[ not stated in the abstract ]

humansheart rate

Can Wearable Devices Accurately Measure Heart Rate Variability? A Systematic Review.

Journal

Folia medica · 2019

PMID

29668452

RCR

8.7

Citations

131

Study type

Systematic review

Sample size

[ not stated in the abstract ]

electrocardiographyexercise

Deriving Accurate Nocturnal Heart Rate, rMSSD and Frequency HRV from the Oura Ring.

Journal

Sensors (Basel, Switzerland) · 2024

PMID

39686012

RCR

1.6

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansheart rate

A Comparative Study Between ECG- and PPG-Based Heart Rate Sensors for Heart Rate Variability Measurements: Influence of Body Position, Duration, Sex, and Age.

Journal

Sensors (Basel, Switzerland) · 2025

PMID

41012985

RCR

2.1

Citations

Study type

Comparative study

Sample size

[ not stated in the abstract ]

humansheart rate

Limited Validity of the Low-Cost Coospo H808S Heart-Rate Monitor Compared to the Polar H10.

Journal

International journal of sports physiology and performance · 2025

PMID

40615117

Citations

Study type

Validity study

Sample size

[ not stated in the abstract ]

humansheart rate

Publication guidelines for human heart rate and heart rate variability studies in psychophysiology-Part 1: Physiological underpinnings and foundations of measurement.

Journal

Psychophysiology · 2024

PMID

38873876

RCR

57.3

Citations

169

Study type

Guideline

Sample size

[ not stated in the abstract ]

humansautonomic nervous system

Supporting Studies18

Comparative analysis of heart rate variability indices from ballistocardiogram and electrocardiogram: a study on measurement agreement.

Journal

Heart and vessels · 2025

PMID

39672926

Citations

Study type

Comparative study

Sample size

25 individuals

humansmale

Reliability of resting-state photoplethysmogram-based pulse rate variability in lifespan samples: implications for cardiovascular research.

Journal

Physiological measurement · 2026

PMID

42055071

Citations

Study type

Primary study

Sample size

n = 536

humansphotoplethysmography

Butterworth Filtering at 500 Hz Optimizes PPG-Based Heart Rate Variability Analysis for Wearable Devices: A Comparative Study.

Journal

Sensors (Basel, Switzerland) · 2025

PMID

41305298

Citations

Study type

Comparative study

Sample size

n = 10

humansheart rate

Effects of electrocardiographic noise on ultra-short term Heart Rate Variability indices.

Journal

Computers in biology and medicine · 2025

PMID

40773995

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansheart rate

Kubios HRV--heart rate variability analysis software.

Journal

Computer methods and programs in biomedicine · 2014

PMID

24054542

RCR

84.6

Citations

1,722

Study type

Primary study

Sample size

[ not stated in the abstract ]

algorithmsheart rate

Optimizing Intersession Reliability of Heart Rate Variability-The Effects of Artifact Correction and Breathing Type.

Journal

Journal of strength and conditioning research · 2021

PMID

33105371

RCR

2.1

Citations

Study type

Primary study

Sample size

41 participants

adolescentartifacts

Intra-day and inter-day reliability of heart rate variability measurement.

Journal

Journal of sports sciences · 2013

PMID

22963409

RCR

2.3

Citations

Study type

Comparative study

Sample size

99 participants

analysis of variancecircadian rhythm

Test-retest reliability of time- and frequency-domain measures of short-term resting heart rate variability in a healthy young population.

Journal

International journal of psychophysiology : official journal of the International Organization of Psychophysiology · 2026

PMID

41765049

Citations

Study type

Primary study

Sample size

116 participants

humansheart rate

A quantitative systematic review of normal values for short-term heart rate variability in healthy adults.

Journal

Pacing and clinical electrophysiology : PACE · 2011

PMID

20663071

RCR

21.0

Citations

548

Study type

Systematic review

Sample size

21,438 participants

adultfemale

Reference values for time- and frequency-domain heart rate variability measures.

Journal

Heart rhythm · 2018

PMID

26883166

RCR

4.8

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

adultautonomic nervous system

Validity and reliability of short-term heart-rate variability from the Polar S810.

Journal

Medicine and science in sports and exercise · 2009

PMID

19092682

RCR

9.0

Citations

217

Study type

Validity study

Sample size

[ not stated in the abstract ]

adultalgorithms

Evaluation of HRV-PRV agreement with autoencoder-based signal quality assessment in resting and dynamic conditions.

Journal

Physiological measurement · 2026

PMID

42556396

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansautoencoder

Heart Rate Variability Analysis on CEBS Database Signals.

Journal

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference · 2019

PMID

30441629

RCR

0.7

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

electrocardiographyheart rate

The Novel Estimation Algorithm of Heart Rate Variability and Stress Using Facial Video Analysis.

Journal

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference · 2025

PMID

40039066

RCR

0.0

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansheart rate

Hybrid CNN-LSTM Model for Evaluating Heart Rate Variability from Pulse-to-Pulse Intervals.

Journal

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference · 2025

PMID

41336669

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansheart rate

Validation of the ultra short term heart rate variability measures under changing psychophysiological state of the healthy participants at rest.

Journal

Scientific reports · 2026

PMID

42243172

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansheart rate

Reproducibility of 24-h heart rate variability in children.

Journal

Clinical autonomic research : official journal of the Clinical Autonomic Research Society · 2018

PMID

28667574

RCR

0.3

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

adolescentaging

Validity of the Polar H7 Heart Rate Sensor for Heart Rate Variability Analysis during Exercise in Different Age, Body Composition and Fitness Level Groups.

Journal

Sensors (Basel, Switzerland) · 2021

PMID

33572800

RCR

4.6

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

adultaged

Conflicting Studies2

Signal Quality Assessment and Reconstruction of PPG-Derived Signals for Heart Rate and Variability Estimation in In-Vehicle Applications: A Comparative Review and Empirical Validation.

Journal

Sensors (Basel, Switzerland) · 2025

PMID

41471550

RCR

2.0

Citations

Study type

Comparative study

Sample size

[ not stated in the abstract ]

Bears on

Secondary point

humansheart rate

The reliability of short-term measurements of heart rate variability.

Journal

International journal of cardiology · 2005

PMID

16098384

RCR

7.4

Citations

208

Study type

Review

Sample size

[ not stated in the abstract ]

Bears on

Core claim

heart ratehumans

Evidence for: Higher trait neuroticism is associated with lower heart rate variability.

8 scored

Anchor Studies2

The Association between Neuroticism and Heart Rate Variability Is Not Fully Explained by Cardiovascular Disease and Depression.

Journal

PloS one · 2016

PMID

25951236

RCR

0.8

Citations

Study type

Primary study

Sample size

n = 1,255

adultanxiety disorders

Determinants of heart rate variability in the general population: The Lifelines Cohort Study.

Journal

Heart rhythm · 2019

PMID

29753022

RCR

3.8

Citations

Study type

Primary study

Sample size

n = 149,205

adolescentadult

Supporting Studies5

Neuroticism's importance in understanding the daily life correlates of heart rate variability.

Journal

Emotion (Washington, D.C.) · 2010

PMID

20677870

RCR

1.2

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

activities of daily livingaffect

Decreased heart rate variability during emotion regulation in subjects at risk for psychopathology.

Journal

Psychological medicine · 2012

PMID

22067596

RCR

2.9

Citations

Study type

Primary study

Sample size

n = 13

adultanalysis of variance

Measures of the psychophysiological response to recurrent anticipatory stress - the influence of neuroticism on heart rhythm and skin resistance.

Journal

Scientific reports · 2026

PMID

41272229

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansheart rate

Relationship between neuroticism, threat of shock and heart rate variability reactivity.

Journal

International maritime health · 2014

PMID

23788220

RCR

0.1

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

adolescentadult

Neuroticism and extraversion in relation to physiological stress reactivity during adolescence.

Journal

Biological psychology · 2017

PMID

26956979

RCR

2.1

Citations

Study type

Primary study

Sample size

n = 327

adolescentadolescent development

Null-Result Studies1

Association of negative affect with resting heart rate variability in medical students.

Journal

Biological psychology · 2025

PMID

40541707

Citations

Study type

Primary study

Sample size

294 women

Bears on

Core claim

humansheart rate

01On Our Desk

In Progress

What we're reading right now

A study only enters a claim's evidence once it's read in full and weighed against what's already in file.

Identified

Queued

Under Review

Extracted

Pending Consensus

Wearable Prompt: In-Context Learning for Depression and Anxiety Prediction from Consumer Smart Ring Metrics

Identified

medRxiv · 2026·Explores LLM-based prediction of depression and anxiety from consumer smart ring metrics including HRV; relevant to consumer wearable use cases but not yet peer-reviewed and does not directly test HRV accuracy or the physiological claim.

PreprintNot peer reviewed. Does not influence any evidence rating until critically evaluated.

Cortical Thinning Predicts Resting Vagally Mediated Heart Rate Variability: A Longitudinal Study Across Adolescent Development

Identified

bioRxiv · 2026·Longitudinal adolescent neuroimaging study linking cortical thinning to resting vagally-mediated HRV; relevant background for the physiological claim's brain-body interpretation but not yet peer-reviewed.

PreprintNot peer reviewed. Does not influence any evidence rating until critically evaluated.

02Research Log

JUL 9 2026

doi:10.1007/s00380-024-02506-2 entered as supporting on the measurement validity claim.

doi:10.1016/j.cmpb.2013.07.024 entered as supporting on the measurement validity claim.

doi:10.1016/j.compbiomed.2025.110803 entered as supporting on the measurement validity claim.

doi:10.1016/j.hrthm.2016.02.006 entered as supporting on the measurement validity claim.

doi:10.1016/j.ijcard.2004.09.013 entered as conflicting on the measurement validity claim.

doi:10.1016/j.ijpsycho.2026.113341 entered as supporting on the measurement validity claim.

doi:10.1080/02640414.2012.721931 entered as supporting on the measurement validity claim.

doi:10.1088/1361-6579/ae66c7 entered as supporting on the measurement validity claim.

doi:10.1111/j.1540-8159.2010.02841.x entered as supporting on the measurement validity claim.

doi:10.1111/psyp.14604 entered as anchor on the measurement validity claim.

doi:10.1123/ijspp.2025-0126 entered as anchor on the measurement validity claim.

doi:10.14814/phy2.70527 entered as anchor on the measurement validity claim.

doi:10.1519/jsc.0000000000002258 entered as supporting on the measurement validity claim.

doi:10.2478/folmed-2018-0012 entered as anchor on the measurement validity claim.

doi:10.3390/s24196220 entered as anchor on the measurement validity claim.

doi:10.3390/s24237475 entered as anchor on the measurement validity claim.

doi:10.3390/s25185745 entered as anchor on the measurement validity claim.

doi:10.3390/s25227091 entered as supporting on the measurement validity claim.

doi:10.3390/s25247556 entered as conflicting on the measurement validity claim.

doi:10.1007/s00421-003-0953-9 entered as supporting on the physiological claim.

doi:10.1007/s10484-025-09708-y entered as supporting on the physiological claim.

doi:10.1007/s11517-006-0119-0 entered as supporting on the physiological claim.

doi:10.1016/b978-0-444-53491-0.00031-6 entered as supporting on the physiological claim.

doi:10.1016/j.ijcard.2009.09.543 entered as anchor on the physiological claim.

doi:10.1016/j.pcad.2012.09.001 entered as supporting on the physiological claim.

doi:10.1016/s0735-1097(96)00342-7 entered as anchor on the physiological claim.

doi:10.1063/1.5038818 entered as anchor on the physiological claim.

doi:10.1111/anec.12148 entered as supporting on the physiological claim.

doi:10.1152/ajpheart.00738.2025 entered as supporting on the physiological claim.

doi:10.1177/1099800419877442 entered as anchor on the physiological claim.

doi:10.18632/aging.101386 entered as anchor on the physiological claim.

doi:10.3390/s25144415 entered as supporting on the physiological claim.

doi:10.3390/s25237147 entered as supporting on the physiological claim.

doi:10.3390/s26041325 entered as null_result on the physiological claim.

doi:10.5271/sjweh.15 entered as supporting on the physiological claim.

doi:10.7717/peerj.19347 entered as supporting on the physiological claim.

pmid:1504981 entered as supporting on the physiological claim.

JUL 9 2026

doi:10.1016/j.ijcard.2004.09.013 entered as a conflicting study on the measurement validity claim, bearing on the core claim.

It caps the rating until reconciled.

JUL 9 2026

doi:10.3390/s25247556 entered as a conflicting study on the measurement validity claim, flagged as bearing on a secondary point, not the core direction.

Because it does not hit the core claim, it does not cap the rating and is tracked as an open question.

JUL 9 2026

doi:10.3390/s26041325 entered as a null result study on the physiological claim, flagged as bearing on a secondary point, not the core direction.

Because it does not hit the core claim, it does not cap the rating and is tracked as an open question.

JUL 11 2026

doi:10.1016/j.hrthm.2018.05.006 entered as anchor on the physiological claim.

doi:10.1037/abn0000946 entered as supporting on the physiological claim.

doi:10.1177/1099800419877442 entered as anchor on the physiological claim.

doi:10.1371/journal.pone.0125882 entered as supporting on the physiological claim.

doi:10.1371/journal.pone.0146131 entered as supporting on the physiological claim.

doi:10.18632/aging.101386 entered as supporting on the physiological claim.

JUL 11 2026

doi:10.1016/j.biopsycho.2016.03.002 entered as supporting on the trait neuroticism claim.

doi:10.1016/j.biopsycho.2025.109073 entered as null_result on the trait neuroticism claim.

doi:10.1016/j.hrthm.2018.05.006 entered as anchor on the trait neuroticism claim.

doi:10.1017/s0033291711002479 entered as supporting on the trait neuroticism claim.

doi:10.1037/a0018698 entered as supporting on the trait neuroticism claim.

doi:10.1038/s41598-025-28090-7 entered as supporting on the trait neuroticism claim.

doi:10.1371/journal.pone.0125882 entered as anchor on the trait neuroticism claim.

pmid:23788220 entered as supporting on the trait neuroticism claim.

JUL 11 2026

doi:10.1016/j.biopsycho.2025.109073 entered as a null result study on the trait neuroticism claim, bearing on the core claim.

It caps the rating until reconciled.

JUL 17 2026

doi:10.1002/ab.70004 entered as null_result on the physiological claim.

JUL 17 2026

doi:10.1002/ab.70004 entered as a null result study on the physiological claim, flagged as bearing on a secondary point, not the core direction.

Because it does not hit the core claim, it does not cap the rating and is tracked as an open question.

JUL 17 2026

doi:10.1016/j.ijcard.2009.09.543 entered as anchor on the physiological claim.

AUG 7 2026

doi:10.14814/phy2.70527 entered as anchor on the measurement validity claim.

doi:10.1016/j.ijcard.2009.09.543 entered as anchor on the physiological claim.

doi:10.1016/j.ijpsycho.2026.113441 entered as supporting on the physiological claim.

doi:10.1016/j.tvjl.2026.106722 entered as supporting on the physiological claim.

doi:10.1063/1.5038818 entered as anchor on the physiological claim.

doi:10.1177/1099800419877442 entered as anchor on the physiological claim.

AUG 14 2026

doi:10.1002/ab.70004 entered as null_result on the physiological claim.

AUG 14 2026

doi:10.1002/ab.70004 entered as a null result study on the physiological claim, flagged as bearing on a secondary point, not the core direction.

Because it does not hit the core claim, it does not cap the rating and is tracked as an open question.

AUG 21 2026

doi:10.1007/s10286-017-0445-3 entered as supporting on the measurement validity claim.

doi:10.1038/s41598-026-55797-y entered as supporting on the measurement validity claim.

doi:10.1088/1361-6579/ae95ae entered as supporting on the measurement validity claim.

doi:10.1109/embc.2018.8513551 entered as supporting on the measurement validity claim.

doi:10.1109/embc53108.2024.10782703 entered as supporting on the measurement validity claim.

doi:10.1109/embc58623.2025.11252777 entered as supporting on the measurement validity claim.

doi:10.1249/mss.0b013e318184a4b1 entered as supporting on the measurement validity claim.

doi:10.1002/(sici)1096-8628(19990402)83:4<296::aid-ajmg11>3.0.co;2-d entered as supporting on the physiological claim.

doi:10.1002/smi.3373 entered as supporting on the physiological claim.

doi:10.1007/s10484-010-9141-y entered as supporting on the physiological claim.

doi:10.1007/s10865-024-00468-4 entered as supporting on the physiological claim.

doi:10.1016/j.drugalcdep.2013.02.025 entered as supporting on the physiological claim.

doi:10.1016/j.ijcard.2013.04.147 entered as supporting on the physiological claim.

doi:10.1016/j.ijcard.2013.06.107 entered as supporting on the physiological claim.

doi:10.1016/j.ijcard.2015.03.383 entered as supporting on the physiological claim.

doi:10.1016/j.ijcard.2017.03.087 entered as supporting on the physiological claim.

doi:10.1016/j.ijpsycho.2016.04.008 entered as supporting on the physiological claim.

doi:10.1016/j.jpain.2019.07.003 entered as supporting on the physiological claim.

doi:10.1016/j.jpsychores.2026.112901 entered as supporting on the physiological claim.

doi:10.1016/j.lssr.2026.03.003 entered as supporting on the physiological claim.

doi:10.1016/j.msard.2018.06.012 entered as supporting on the physiological claim.

doi:10.1023/a:1016381025759 entered as supporting on the physiological claim.

doi:10.1037/emo0001658 entered as supporting on the physiological claim.

doi:10.1038/s41598-026-66516-y entered as anchor on the physiological claim.

doi:10.1080/15402002.2023.2255329 entered as supporting on the physiological claim.

doi:10.1093/sleep/zsag150 entered as anchor on the physiological claim.

doi:10.1111/1469-8986.00072 entered as supporting on the physiological claim.

doi:10.1111/j.1528-1157.1997.tb06128.x entered as supporting on the physiological claim.

doi:10.1136/hrt.57.1.109-a entered as supporting on the physiological claim.

doi:10.1159/000169270 entered as supporting on the physiological claim.

doi:10.1186/s12872-026-06073-4 entered as supporting on the physiological claim.

doi:10.30476/ijms.2025.105405.3916 entered as supporting on the physiological claim.

doi:10.3389/fendo.2026.1863377 entered as supporting on the physiological claim.

doi:10.3389/fneur.2026.1903721 entered as supporting on the physiological claim.

pmid:8653852 entered as supporting on the physiological claim.

SEP 4 2026

doi:10.3390/s21030902 entered as supporting on the measurement validity claim.

doi:10.1053/euhj.2001.2972 entered as supporting on the physiological claim.

doi:10.1159/000469716 entered as supporting on the physiological claim.

doi:10.1161/jaha.121.021585 entered as supporting on the physiological claim.

pmid:23032907 entered as supporting on the physiological claim.

04Revision Log

JUL 11 2026

trait neuroticism: opened at Emerging

Opened at Emerging by rule from the current evidence for: Higher trait neuroticism is associated with lower resting heart rate variability..

JUL 9 2026

measurement validity: opened at Uncertain

Opened at Uncertain by rule from the current evidence for: Consumer wearable devices measure HRV with sufficient agreement to a validated reference to be meaningful..

JUL 9 2026

physiological: opened at Established

Opened at Established by rule from the current evidence for: Lower heart rate variability is associated with worse cardiovascular and autonomic health outcomes..

This page interprets published research. It is not medical advice. The KnowYourPrime Research Desk rates the evidence supporting a claim, not the claim itself. It does not diagnose or treat. Talk to your own doctor about your health.