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Cluster analysis was carried out to evaluate how these phenotypic characteristics influenced HR and HRV measurements. For this purpose, sixty-seven volunteers performed a test consisting of the following consecutive segments: sitting rest, three submaximal exercise intensities in cycle-ergometer and sitting recovery. The agreement between HRV indices derived from Polar H7 and a simultaneous electrocardiogram (ECG) was assessed using concordance correlation coefficient (CCC). The percentage of subjects not reaching excellent agreement (CCC &gt; 0.90) was higher for high-frequency power (PHF) than for low-frequency power (PLF) of HRV and increased with exercise intensity. A cluster of unfit and not young volunteers with high trunk fat percentage showed the highest error in HRV indices. This study indicates that Polar H7 and ECG were interchangeable at rest. During exercise, HR and PLF showed excellent agreement between devices. However, during the highest exercise intensity, CCC for PHF was lower than 0.90 in as many as 60% of the volunteers. During recovery, HR but not HRV measurements were accurate. As a conclusion, phenotypic differences between subjects can represent one of the causes for disagreement between HR sensors and ECG devices, which should be considered specifically when using Polar H7 and, generally, in the validation of any HR sensor for HRV analysis.<\/jats:p>","DOI":"10.3390\/s21030902","type":"journal-article","created":{"date-parts":[[2021,1,29]],"date-time":"2021-01-29T09:25:22Z","timestamp":1611912322000},"page":"902","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":51,"title":["Validity of the Polar H7 Heart Rate Sensor for Heart Rate Variability Analysis during Exercise in Different Age, Body Composition and Fitness Level Groups"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6025-5070","authenticated-orcid":false,"given":"Adri\u00e1n","family":"Hern\u00e1ndez-Vicente","sequence":"first","affiliation":[{"name":"Growth, Exercise, NUtrition and Development (GENUD) Research Group, University of Zaragoza, 50009 Zaragoza, Spain"},{"name":"Department of Physiatry and Nursing, Faculty of Health and Sport Science (FCSD), University of Zaragoza, 22002 Huesca, Spain"},{"name":"Red Espa\u00f1ola de Investigaci\u00f3n en Ejercicio F\u00edsico y Salud en Poblaciones Especiales (EXERNET), Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1462-4880","authenticated-orcid":false,"given":"David","family":"Hernando","sequence":"additional","affiliation":[{"name":"BSICOS, Arag\u00f3n Institute for Engineering Research (I3A), IIS Arag\u00f3n, University of Zaragoza, 50015 Zaragoza, Spain"},{"name":"CIBER de Bioingenier\u00eda, Biomateriales y Nanomedicina (CIBER-BBN), 50009 Zaragoza, Spain"}]},{"given":"Jorge","family":"Mar\u00edn-Puyalto","sequence":"additional","affiliation":[{"name":"Growth, Exercise, NUtrition and Development (GENUD) Research Group, University of Zaragoza, 50009 Zaragoza, Spain"},{"name":"Department of Physiatry and Nursing, Faculty of Health and Sport Science (FCSD), University of Zaragoza, 22002 Huesca, Spain"},{"name":"Red Espa\u00f1ola de Investigaci\u00f3n en Ejercicio F\u00edsico y Salud en Poblaciones Especiales (EXERNET), Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4303-4097","authenticated-orcid":false,"given":"Germ\u00e1n","family":"Vicente-Rodr\u00edguez","sequence":"additional","affiliation":[{"name":"Growth, Exercise, NUtrition and Development (GENUD) Research Group, University of Zaragoza, 50009 Zaragoza, Spain"},{"name":"Department of Physiatry and Nursing, Faculty of Health and Sport Science (FCSD), University of Zaragoza, 22002 Huesca, Spain"},{"name":"Red Espa\u00f1ola de Investigaci\u00f3n en Ejercicio F\u00edsico y Salud en Poblaciones Especiales (EXERNET), Spain"},{"name":"Centro de Investigaci\u00f3n Biom\u00e9dica en Red de Fisiopatolog\u00eda de la Obesidad y Nutrici\u00f3n (CIBER-Obn), 28029 Madrid, Spain"},{"name":"Instituto Agroalimentario de Arag\u00f3n-IA2- CITA-Universidad de Zaragoza), 50013 Zaragoza, Spain"}]},{"given":"Nuria","family":"Garatachea","sequence":"additional","affiliation":[{"name":"Growth, Exercise, NUtrition and Development (GENUD) Research Group, University of Zaragoza, 50009 Zaragoza, Spain"},{"name":"Department of Physiatry and Nursing, Faculty of Health and Sport Science (FCSD), University of Zaragoza, 22002 Huesca, Spain"},{"name":"Red Espa\u00f1ola de Investigaci\u00f3n en Ejercicio F\u00edsico y Salud en Poblaciones Especiales (EXERNET), Spain"},{"name":"Centro de Investigaci\u00f3n Biom\u00e9dica en Red de Fisiopatolog\u00eda de la Obesidad y Nutrici\u00f3n (CIBER-Obn), 28029 Madrid, Spain"},{"name":"Instituto Agroalimentario de Arag\u00f3n-IA2- CITA-Universidad de Zaragoza), 50013 Zaragoza, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1960-407X","authenticated-orcid":false,"given":"Esther","family":"Pueyo","sequence":"additional","affiliation":[{"name":"BSICOS, Arag\u00f3n Institute for Engineering Research (I3A), IIS Arag\u00f3n, University of Zaragoza, 50015 Zaragoza, Spain"},{"name":"CIBER de Bioingenier\u00eda, Biomateriales y Nanomedicina (CIBER-BBN), 50009 Zaragoza, Spain"}]},{"given":"Raquel","family":"Bail\u00f3n","sequence":"additional","affiliation":[{"name":"BSICOS, Arag\u00f3n Institute for Engineering Research (I3A), IIS Arag\u00f3n, University of Zaragoza, 50015 Zaragoza, Spain"},{"name":"CIBER de Bioingenier\u00eda, Biomateriales y Nanomedicina (CIBER-BBN), 50009 Zaragoza, Spain"}]}],"member":"1968","published-online":{"date-parts":[[2021,1,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"354","DOI":"10.1093\/oxfordjournals.eurheartj.a014868","article-title":"Heart rate variability. Standards of measurement, physiological interpretation, and clinical use","volume":"17","author":"Malik","year":"1996","journal-title":"Eur. Heart J."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"639","DOI":"10.1002\/dmrr.1239","article-title":"Cardiovascular autonomic neuropathy in diabetes: Clinical impact, assessment, diagnosis, and management","volume":"27","author":"Spallone","year":"2011","journal-title":"Diabetes Metab. Res. Rev."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"258","DOI":"10.1016\/0002-9149(87)90795-8","article-title":"Decreased Heart Rate Variability and Its Association with Increased Mortality After Acute Myocardial Infarction","volume":"59","author":"Kleiger","year":"1987","journal-title":"Am. J. Cardiol."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1016\/S0002-9149(02)02380-9","article-title":"Prognostic value of heart rate variability in chronic congestive heart failure (Veterans Affairs\u2019 Survival Trial of Antiarrhythmic Therapy in Congestive Heart Failure)","volume":"90","author":"Bilchick","year":"2002","journal-title":"Am. J. Cardiol."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"547","DOI":"10.1016\/j.neubiorev.2017.09.006","article-title":"From psychological moments to mortality: A multidisciplinary synthesis on heart rate variability spanning the continuum of time","volume":"83","author":"Kemp","year":"2017","journal-title":"Neurosci. Biobehav. Rev."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"458","DOI":"10.3389\/fnins.2018.00458","article-title":"Vagal Tank theory: The three Rs of cardiac vagal control functioning\u2014Resting, reactivity, and recovery","volume":"12","author":"Laborde","year":"2018","journal-title":"Front. Neurosci."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"639","DOI":"10.3389\/fphys.2018.00639","article-title":"Heart rate monitoring in team sports-A conceptual framework for contextualizing heart rate measures for training and recovery prescription","volume":"9","author":"Schneider","year":"2018","journal-title":"Front. Physiol."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"259","DOI":"10.1007\/s10877-012-9424-3","article-title":"Influence of age and gender on autonomic regulation of heart","volume":"27","author":"Abhishekh","year":"2013","journal-title":"J. Clin. Monit. Comput."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"417","DOI":"10.1007\/s40279-019-01061-5","article-title":"The Accuracy of Acquiring Heart Rate Variability from Portable Devices: A Systematic Review and Meta-Analysis","volume":"49","author":"Dobbs","year":"2019","journal-title":"Sport. Med."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"563","DOI":"10.1007\/s00421-015-3303-9","article-title":"Validity of the Polar V800 heart rate monitor to measure RR intervals at rest","volume":"116","author":"Giles","year":"2016","journal-title":"Eur. J. Appl. Physiol."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"669","DOI":"10.1007\/s00421-018-3808-0","article-title":"Validity of the Polar V800 monitor for measuring heart rate variability in mountain running route conditions","volume":"118","author":"Caminal","year":"2018","journal-title":"Eur. J. Appl. Physiol."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1525","DOI":"10.1007\/s00421-019-04142-5","article-title":"RR interval signal quality of a heart rate monitor and an ECG Holter at rest and during exercise","volume":"119","author":"Schweizer","year":"2019","journal-title":"Eur. J. Appl. Physiol."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"352","DOI":"10.1186\/s13063-019-3415-3","article-title":"The acute effects of aerobic exercise on sleep in patients with depression: Study protocol for a randomized controlled trial","volume":"20","author":"Brupbacher","year":"2019","journal-title":"Trials"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"7051","DOI":"10.4081\/ejtm.2018.7051","article-title":"Resting sympatho-vagal balance is related to 10 km running performance in master endurance athletes","volume":"28","author":"Cataldo","year":"2018","journal-title":"Eur. J. Transl. Myol."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1694","DOI":"10.1016\/j.jacc.2017.01.037","article-title":"Electrocardiographic Criteria for the Diagnosis of Left Ventricular Hypertrophy","volume":"63","author":"Peguero","year":"2017","journal-title":"J. Am. Coll. Cardiol."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"125","DOI":"10.1136\/bjsports-2012-092068","article-title":"Normal electrocardiographic findings: Recognising physiological adaptations in athletes","volume":"47","author":"Drezner","year":"2013","journal-title":"Br. J. Sports Med."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"716","DOI":"10.1519\/JSC.0000000000001662","article-title":"Validation of heart rate monitor Polar RS800 for heart rate variability analysis during exercise","volume":"32","author":"Hernando","year":"2016","journal-title":"J. Strength Cond. Res."},{"key":"ref_18","unstructured":"Wasserman, K., Hansen, J.E., Sue, D.Y., Stringer, W.W., Sietsema, K.E., Sun, X.G., and Whipp, B.J. (2011). Principles of Exercise Testing and Interpretation: Including Pathophysiology and Clinical Applications, Lippincott Williams & Wilkins. [5th ed.]."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"153","DOI":"10.1016\/S0735-1097(00)01054-8","article-title":"Age-predicted maximal heart rate revisited","volume":"37","author":"Tanaka","year":"2001","journal-title":"J. Am. Coll. Cardiol."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1479","DOI":"10.1038\/sj.ejcn.1601993","article-title":"New bioimpedance analysis system: Improved phenotyping with whole-body analysis","volume":"58","author":"Pietrobelli","year":"2004","journal-title":"Eur. J. Clin. Nutr."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"782","DOI":"10.1093\/ptj\/80.8.782","article-title":"Submaximal Exercise Testing: Clinical Application and Interpretation","volume":"80","author":"Noonan","year":"2000","journal-title":"Phys. Ther."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"258","DOI":"10.3389\/fpubh.2017.00258","article-title":"An Overview of Heart Rate Variability Metrics and Norms","volume":"5","author":"Shaffer","year":"2017","journal-title":"Front. Public Health"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"348","DOI":"10.1097\/00005768-199902000-00020","article-title":"Utility of pwc75% as an estimate of aerobic power in epidemiological and population-based studies","volume":"31","author":"Gore","year":"1999","journal-title":"Med. Sci. Sports Exerc."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"1196","DOI":"10.1016\/j.apmr.2012.02.021","article-title":"PWC 75%\/kg, a fitness index not linked to resting heart rate: Testing procedure and reference values","volume":"93","author":"Batcho","year":"2012","journal-title":"Arch. Phys. Med. Rehabil."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"961","DOI":"10.1007\/s10654-019-00575-6","article-title":"Association between cardiorespiratory fitness and colorectal cancer in the UK Biobank","volume":"35","author":"Hillreiner","year":"2019","journal-title":"Eur. J. Epidemiol."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"885","DOI":"10.1007\/s00103-013-1694-5","article-title":"Measurement of cardiorespiratory fitness in the German Health Interview and Examination Survey for Adults (DEGS1)","volume":"56","author":"Finger","year":"2013","journal-title":"Bundesgesundheitsblatt Gesundheitsforsch. Gesundheitsschutz"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"570","DOI":"10.1109\/TBME.2003.821031","article-title":"A Wavelet-Based ECG Delineator Evaluation on Standard Databases","volume":"51","author":"Almeida","year":"2004","journal-title":"IEEE Trans. Biomed. Eng."},{"key":"ref_28","unstructured":"Hernando, D., Bail\u00f3n, R., Almeida, R., and Hern\u00e1ndez, A. (2014, January 7\u201310). QRS detection optimization in stress test recordings using evolutionary algorithms. Proceedings of the XLI Int Conf Computing in Cardiology, Cambridge, MA, USA."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"334","DOI":"10.1109\/TBME.2003.808831","article-title":"Analysis of heart rate variability in the presence of ectopic beats using the heart timing signal","volume":"50","author":"Mateo","year":"2003","journal-title":"IEEE Trans. Biomed. Eng."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"642","DOI":"10.1109\/TBME.2010.2095011","article-title":"The integral pulse frequency modulation model with time-varying threshold: Application to heart rate variability analysis during exercise stress testing","volume":"58","author":"Laouini","year":"2011","journal-title":"IEEE Trans. Biomed. Eng."},{"key":"ref_31","first-page":"19","article-title":"The need to report effect size estimates revisited. An overview of some recommended measures of effect size","volume":"1","author":"Tomczak","year":"2014","journal-title":"Trends Sport Sci."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"155","DOI":"10.1037\/0033-2909.112.1.155","article-title":"A power primer","volume":"112","author":"Cohen","year":"1992","journal-title":"Psychol. Bull."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"255","DOI":"10.2307\/2532051","article-title":"A Concordance Correlation Coefficient to Evaluate Reproducibility","volume":"45","author":"Lin","year":"1989","journal-title":"Biometrics"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"155","DOI":"10.1016\/j.jcm.2016.02.012","article-title":"A Guideline of Selecting and Reporting Intraclass Correlation Coefficients for Reliability Research","volume":"15","author":"Koo","year":"2016","journal-title":"J. Chiropr. Med."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"26","DOI":"10.1353\/mpq.0.0015","article-title":"Associations between early childhood temperament clusters and later psychosocial adjustment","volume":"55","author":"Sanson","year":"2009","journal-title":"Merrill. Palmer. Q."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"1057","DOI":"10.1017\/S0007114519000278","article-title":"Associations of dietary energy density with body composition and cardiometabolic risk in children with overweight and obesity: Role of energy density calculations, under-reporting energy intake and physical activity","volume":"121","author":"Arenaza","year":"2019","journal-title":"Br. J. Nutr."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"73","DOI":"10.3389\/fphys.2014.00073","article-title":"Monitoring training status with HR measures: Do all roads lead to Rome?","volume":"5","author":"Buchheit","year":"2014","journal-title":"Front. Physiol."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"88","DOI":"10.1111\/j.1542-474X.2005.10101.x","article-title":"Heart rate variability: Measurement and clinical utility","volume":"10","author":"Kleiger","year":"2005","journal-title":"Ann. Noninvasive Electrocardiol."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"301","DOI":"10.3389\/fphys.2017.00301","article-title":"Cardiac autonomic responses during exercise and post-exercise recovery using heart rate variability and systolic time intervals-a review","volume":"8","author":"Michael","year":"2017","journal-title":"Front. Physiol."},{"key":"ref_40","unstructured":"He, W., Goodkind, D., and Kowal, P. (2016). U.S. Census Bureau, International Population Reports. U.S. Gov. Publ. Off., P95\/16-1."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"152","DOI":"10.1152\/physiol.00029.2016","article-title":"Physical activity, aging, and physiological function","volume":"32","author":"Harridge","year":"2017","journal-title":"Physiology"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"e0013","DOI":"10.1097\/pp9.0000000000000013","article-title":"Fitness and Fatness as Health Markers through the Lifespan: An Overview of Current Knowledge","volume":"3","author":"Ortega","year":"2018","journal-title":"Prog. Prev. Med."},{"key":"ref_43","unstructured":"(2019). Polar Research Center Polar H10 Heart Rate Sensor System. White Pap., 1, 1\u20136."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/21\/3\/902\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T05:17:03Z","timestamp":1760159823000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/21\/3\/902"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,1,29]]},"references-count":43,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2021,2]]}},"alternative-id":["s21030902"],"URL":"https:\/\/doi.org\/10.3390\/s21030902","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,1,29]]}}}