FILE: VO2MAX · OPENED JUL 9 2026 · REV 1 LIVE FILE

VO2MAX Research Desk

The working file on VO2MAX. Each claim below is rated on its own evidence.

Does higher VO2max / cardiorespiratory fitness predict lower mortality?

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

Higher cardiorespiratory fitness (VO2max) is associated with lower all-cause and cardiovascular mortality risk.

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.

24 studies scored · 7 anchor · 17 supporting · Last reviewed Jul 9, 2026

Does exercise training reliably increase VO2max?

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

Structured aerobic exercise training improves VO2max in healthy adults.

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.

7 studies scored · 3 anchor · 4 supporting · Last reviewed Jul 9, 2026

Are consumer-wearable VO2max estimates accurate against gold-standard testing?

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

Consumer wearable devices estimate VO2max accurately enough to be meaningful.

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.

6 studies scored · 3 anchor · 3 supporting · Last reviewed Jul 9, 2026

Studies in Pool37

Claims Rated3

Last PubMed Sync[ pending ]

Next Scheduled Review[ not yet scheduled ]

8 systematic reviews 3 RCTs 15 observational 2 validity studies 9 other

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

Evidence for: Higher cardiorespiratory fitness (VO2max) is associated with lower all-cause and cardiovascular mortality risk.

24 scored

Anchor Studies7

Cardiorespiratory fitness as a quantitative predictor of all-cause mortality and cardiovascular events in healthy men and women: a meta-analysis.

Journal

JAMA · 2009

PMID

19454641

RCR

75.0

Citations

2,357

Study type

Meta-analysis

Sample size

[ pending extraction ]

cardiovascular diseasescoronary disease

Cardiorespiratory fitness is a strong and consistent predictor of morbidity and mortality among adults: an overview of meta-analyses representing over 20.9 million observations from 199 unique cohort studies.

Journal

British journal of sports medicine · 2024

PMID

38599681

RCR

36.1

Citations

148

Study type

Meta-analysis

Sample size

[ pending extraction ]

humanscardiorespiratory fitness

Comparison of objectively measured and estimated cardiorespiratory fitness to predict all-cause and cardiovascular disease mortality in adults: A systematic review and meta-analysis of 42 studies representing 35 cohorts and 3.8 million observations.

Journal

Journal of sport and health science · 2025

PMID

39271056

RCR

5.0

Citations

Study type

Meta-analysis

Sample size

[ pending extraction ]

humanscardiorespiratory fitness

Cardiorespiratory Fitness and Mortality Risk Across the Spectra of Age, Race, and Sex.

Journal

Journal of the American College of Cardiology · 2022

PMID

35926933

RCR

21.0

Citations

211

Study type

Primary study

Sample size

[ pending extraction ]

agedaged, 80 and over

Importance of Assessing Cardiorespiratory Fitness in Clinical Practice: A Case for Fitness as a Clinical Vital Sign: A Scientific Statement From the American Heart Association.

Journal

Circulation · 2017

PMID

27881567

RCR

87.0

Citations

1,883

Study type

Review

Sample size

[ pending extraction ]

cardiorespiratory fitnesscardiovascular diseases

Physical fitness and all-cause mortality. A prospective study of healthy men and women.

Journal

JAMA · 1989

PMID

2795824

RCR

93.3

Citations

2,589

Study type

Primary study

Sample size

[ pending extraction ]

adultcardiovascular diseases

Association of Cardiorespiratory Fitness With Long-term Mortality Among Adults Undergoing Exercise Treadmill Testing.

Journal

JAMA network open · 2019

PMID

30646252

RCR

16.1

Citations

330

Study type

Primary study

Sample size

[ pending extraction ]

adolescentadult

Supporting Studies17

Fitness vs. fatness on all-cause mortality: a meta-analysis.

Journal

Progress in cardiovascular diseases · 2014

PMID

24438729

RCR

17.7

Citations

457

Study type

Meta-analysis

Sample size

[ pending extraction ]

body mass indexcardiovascular diseases

Cardiorespiratory fitness, body mass index and mortality: a systematic review and meta-analysis.

Journal

British journal of sports medicine · 2025

PMID

39537313

RCR

14.3

Citations

Study type

Meta-analysis

Sample size

[ pending extraction ]

humanscardiorespiratory fitness

Sedentary Behavior, Exercise, and Cardiovascular Health.

Journal

Circulation research · 2019

PMID

30817262

RCR

61.4

Citations

1,074

Study type

Review

Sample size

[ pending extraction ]

animalscardiorespiratory fitness

Is physical activity or physical fitness more important in defining health benefits?

Journal

Medicine and science in sports and exercise · 2001

PMID

11427763

RCR

18.2

Citations

574

Study type

Review

Sample size

[ pending extraction ]

adultaged

Survival of the fittest: VO 2 max, a key predictor of longevity?

Journal

Frontiers in bioscience (Landmark edition) · 2019

PMID

29293447

RCR

5.3

Citations

102

Study type

Review

Sample size

[ pending extraction ]

adaptation, physiologicalaging

The association between physical activity and risk of mortality is modulated by grip strength and cardiorespiratory fitness: evidence from 498 135 UK-Biobank participants.

Journal

European heart journal · 2018

PMID

28158566

RCR

7.1

Citations

184

Study type

Observational study

Sample size

[ pending extraction ]

adultaged

Cardiorespiratory Fitness, Body Composition, Diabetes, and Longevity: A 2-Sample Mendelian Randomization Study.

Journal

The Journal of clinical endocrinology and metabolism · 2025

PMID

38864459

RCR

4.0

Citations

Study type

Primary study

Sample size

[ pending extraction ]

humansmendelian randomization analysis

Polygenic prediction of cardiorespiratory fitness in the Trøndelag health study (HUNT).

Journal

Scientific reports · 2026

PMID

41402372

Citations

Study type

Primary study

Sample size

[ pending extraction ]

humanscardiorespiratory fitness

Evaluation of Genetics in the Association Between Cardiorespiratory Fitness and Health: Insights from a Genome-Wide Polygenic Score for Cardiorespiratory Fitness in the FinnGen and HUNT cohorts.

Journal

Scandinavian journal of medicine & science in sports · 2026

PMID

42087449

Citations

Study type

Primary study

Sample size

[ pending extraction ]

humanscardiorespiratory fitness

Physical Fitness, Biological Aging, and Healthy Longevity.

Journal

Journal of the American Medical Directors Association · 2025

PMID

40789340

Citations

Study type

Observational study

Sample size

[ pending extraction ]

humansmale

Fit Is It for Longevity Across Populations.

Journal

Journal of the American College of Cardiology · 2022

PMID

35926934

RCR

4.5

Citations

Sample size

[ pending extraction ]

cardiorespiratory fitnesscardiovascular diseases

The Impact of Light Physical Activity, Sedentary Behavior and Cardiorespiratory Fitness in Extending Lifespan and Healthspan Outcomes: How Little is Still Significant? A Narrative Review.

Journal

Current problems in cardiology · 2023

PMID

37302646

RCR

0.7

Citations

Study type

Review

Sample size

[ pending extraction ]

humanscardiorespiratory fitness

Associations among cardiorespiratory fitness, C-reactive protein, and all-cause mortality in men and women.

Journal

Journal of investigative medicine : the official publication of the American Federation for Clinical Research · 2023

PMID

36692144

RCR

0.5

Citations

Study type

Primary study

Sample size

[ pending extraction ]

adultmale

[Fitness].

Journal

Ugeskrift for laeger · 2026

PMID

42394460

Citations

Study type

Review

Sample size

[ pending extraction ]

humansoxygen consumption

Expanding the concept of pharma-cise: A graphical primer for clinicians, researchers and industry.

Journal

Current problems in cardiology · 2025

PMID

40769231

Citations

Study type

Review

Sample size

[ pending extraction ]

humansoxygen consumption

N-Palmitoyl Glutamine Is a Candidate Mediator of Cardiorespiratory Fitness.

Journal

Circulation · 2025

PMID

41221589

Citations

Study type

Primary study

Sample size

[ pending extraction ]

humansfemale

Physical Fitness Is Negatively Associated With DNA Methylation-Based Risk of Aging-Related Diseases.

Journal

Aging cell · 2026

PMID

41952035

Citations

Study type

Primary study

Sample size

[ pending extraction ]

humansdna methylation

Evidence for: Structured aerobic exercise training improves VO2max in healthy adults.

7 scored

Anchor Studies3

Effectiveness of High-Intensity Interval Training (HIT) and Continuous Endurance Training for VO2max Improvements: A Systematic Review and Meta-Analysis of Controlled Trials.

Journal

Sports medicine (Auckland, N.Z.) · 2016

PMID

26243014

RCR

29.6

Citations

625

Study type

Meta-analysis

Sample size

[ pending extraction ]

adolescentadult

Six Weeks of Low-Volume Sprint Interval Training Improves Peak Oxygen Uptake Compared to a Non-Exercise Control: A Randomized Controlled Trial.

Journal

Scandinavian journal of medicine & science in sports · 2025

PMID

40879181

Citations

Study type

Randomized controlled trial

Sample size

[ pending extraction ]

humansoxygen consumption

Effect of exercise snacks on fitness and cardiometabolic health in physically inactive individuals: systematic review and meta-analysis.

Journal

British journal of sports medicine · 2026

PMID

41057224

RCR

11.0

Citations

Study type

Meta-analysis

Sample size

[ pending extraction ]

adultaged

Supporting Studies4

Exercise snacks are a time-efficient alternative to moderate-intensity continuous training for improving cardiorespiratory fitness but not maximal fat oxidation in inactive adults: a randomized controlled trial.

Journal

Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme · 2024

PMID

38569204

RCR

7.7

Citations

Study type

Randomized controlled trial

Sample size

[ pending extraction ]

humansmale

Do stair climbing exercise "snacks" improve cardiorespiratory fitness?

Journal

Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme · 2019

PMID

30649897

RCR

4.6

Citations

Study type

Randomized controlled trial

Sample size

[ pending extraction ]

cardiorespiratory fitnessfemale

Effects of Different Training-Intensity Distribution Models on Maximal Oxygen Uptake and Time-Trial Performance in Endurance Athletes: A Bayesian Network Meta-Analysis.

Journal

Journal of strength and conditioning research · 2026

PMID

42171506

Citations

Study type

Meta-analysis

Sample size

[ pending extraction ]

humansbayes theorem

Much Ado About Zone 2: A Narrative Review Assessing the Efficacy of Zone 2 Training for Improving Mitochondrial Capacity and Cardiorespiratory Fitness in the General Population.

Journal

Sports medicine (Auckland, N.Z.) · 2025

PMID

40560504

Citations

Study type

Review

Sample size

[ pending extraction ]

humanscardiorespiratory fitness

Evidence for: Consumer wearable devices estimate VO2max accurately enough to be meaningful.

6 scored

Anchor Studies3

Validation of Aerobic Capacity (VO2max) and Pulse Oximetry in Wearable Technology.

Journal

Sensors (Basel, Switzerland) · 2025

PMID

39797066

RCR

2.5

Citations

Study type

Validity study

Sample size

[ pending extraction ]

humansoximetry

Investigating the accuracy of Apple Watch VO2 max measurements: A validation study.

Journal

PloS one · 2025

PMID

40373042

Citations

Study type

Validity study

Sample size

[ pending extraction ]

humansmale

Validity of Wrist-Worn Activity Trackers for Estimating VO 2max and Energy Expenditure.

Journal

International journal of environmental research and public health · 2020

PMID

31443347

RCR

1.8

Citations

Study type

Primary study

Sample size

[ pending extraction ]

adultenergy metabolism

Supporting Studies3

Cardiorespiratory fitness estimation using wearable sensors: Laboratory and free-living analysis of context-specific submaximal heart rates.

Journal

Journal of applied physiology (Bethesda, Md. : 1985) · 2017

PMID

26940653

RCR

1.0

Citations

Study type

Primary study

Sample size

[ pending extraction ]

activities of daily livingadult

Heart Rate Variability Based Estimation of Maximal Oxygen Uptake in Athletes Using Supervised Regression Models.

Journal

Sensors (Basel, Switzerland) · 2023

PMID

36991963

RCR

0.9

Citations

Study type

Primary study

Sample size

[ pending extraction ]

humansheart rate

Estimating oxygen uptake in simulated team sports using machine learning models and wearable sensor data: A pilot study.

Journal

PloS one · 2025

PMID

40258017

RCR

2.2

Citations

Study type

Primary study

Sample size

[ pending extraction ]

humanspilot projects

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

Nothing on the desk this cycle.

02Research Log

JUL 9 2026

doi:10.1001/jama.2009.681 entered as anchor on the mortality_prediction claim.

doi:10.1001/jama.262.17.2395 entered as anchor on the mortality_prediction claim.

doi:10.1001/jamanetworkopen.2018.3605 entered as anchor on the mortality_prediction claim.

doi:10.1016/j.cpcardiol.2023.101871 entered as supporting on the mortality_prediction claim.

doi:10.1016/j.cpcardiol.2025.103144 entered as supporting on the mortality_prediction claim.

doi:10.1016/j.jacc.2022.05.030 entered as supporting on the mortality_prediction claim.

doi:10.1016/j.jacc.2022.05.031 entered as anchor on the mortality_prediction claim.

doi:10.1016/j.jamda.2025.105792 entered as supporting on the mortality_prediction claim.

doi:10.1016/j.jshs.2024.100986 entered as anchor on the mortality_prediction claim.

doi:10.1016/j.pcad.2013.09.002 entered as supporting on the mortality_prediction claim.

doi:10.1038/s41598-025-28894-7 entered as supporting on the mortality_prediction claim.

doi:10.1093/eurheartj/ehw249 entered as supporting on the mortality_prediction claim.

doi:10.1097/00005768-200106001-00007 entered as supporting on the mortality_prediction claim.

doi:10.1111/acel.70467 entered as supporting on the mortality_prediction claim.

doi:10.1111/sms.70291 entered as supporting on the mortality_prediction claim.

doi:10.1136/bjsports-2023-107849 entered as anchor on the mortality_prediction claim.

doi:10.1136/bjsports-2024-108748 entered as supporting on the mortality_prediction claim.

doi:10.1161/cir.0000000000000461 entered as anchor on the mortality_prediction claim.

doi:10.1161/circresaha.118.312669 entered as supporting on the mortality_prediction claim.

doi:10.1161/circulationaha.125.074187 entered as supporting on the mortality_prediction claim.

doi:10.1177/10815589221149190 entered as supporting on the mortality_prediction claim.

doi:10.1210/clinem/dgae393 entered as supporting on the mortality_prediction claim.

doi:10.2741/4657 entered as supporting on the mortality_prediction claim.

doi:10.61409/v10250801 entered as supporting on the mortality_prediction claim.

doi:10.1007/s40279-015-0365-0 entered as anchor on the trainability claim.

doi:10.1007/s40279-025-02261-y entered as supporting on the trainability claim.

doi:10.1111/sms.70130 entered as anchor on the trainability claim.

doi:10.1136/bjsports-2025-110027 entered as anchor on the trainability claim.

doi:10.1139/apnm-2018-0675 entered as supporting on the trainability claim.

doi:10.1139/apnm-2023-0593 entered as supporting on the trainability claim.

doi:10.1519/jsc.0000000000005415 entered as supporting on the trainability claim.

doi:10.1152/japplphysiol.00519.2015 entered as supporting on the wearable_validity claim.

doi:10.1371/journal.pone.0319760 entered as supporting on the wearable_validity claim.

doi:10.1371/journal.pone.0323741 entered as anchor on the wearable_validity claim.

doi:10.3390/ijerph16173037 entered as anchor on the wearable_validity claim.

doi:10.3390/s23063251 entered as supporting on the wearable_validity claim.

doi:10.3390/s25010275 entered as anchor on the wearable_validity claim.

04Revision Log

JUL 9 2026

wearable_validity: opened at Emerging

Opened at Emerging by rule from the current evidence for: Consumer wearables estimate VO2max in close agreement with laboratory reference measurement..

JUL 9 2026

trainability: opened at Established

Opened at Established by rule from the current evidence for: Aerobic exercise training raises measured VO2max in previously inactive or healthy adults..

JUL 9 2026

mortality_prediction: opened at Established

Opened at Established by rule from the current evidence for: Higher cardiorespiratory fitness predicts lower all-cause mortality risk..

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.