{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T15:40:19Z","timestamp":1760370019971,"version":"build-2065373602"},"reference-count":13,"publisher":"Human Kinetics","issue":"9","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,9,1]]},"abstract":"<jats:p><jats:italic><jats:bold>Purpose<\/jats:bold>:<\/jats:italic> This study assessed the validity and agreement of the low-cost Coospo H808S chest-strap heart-rate (HR) monitor compared with the Polar H10 during varied conditions. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> Fifteen recreational runners (25 [5]\u00a0y) participated in the study. Each participant wore both the Polar H10 and Coospo H808S simultaneously, with strap placement randomized. HR and HR variability (HRV) were recorded for 5\u00a0minutes in 3 conditions: supine, seated, and low-intensity running (rating of perceived exertion 2\u20133\/10). The last 4\u00a0minutes of each recording were analyzed using Kubios HRV software, with both raw and medium-filtered data. Agreement between devices was evaluated using intraclass correlation coefficients (ICCs) and Bland\u2013Altman plots. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> The raw data of the\u00a0Coospo H808S demonstrated excellent agreement with the Polar H10 for HR and HRV in the\u00a0supine condition (ICC\u2009&gt;\u2009.96, <jats:italic>P<\/jats:italic>\u2009&lt;\u2009.001). In the seated position, agreement remained excellent (ICC\u2009&gt;\u2009.99, <jats:italic>P<\/jats:italic>\u2009&lt;\u2009.001). During running, the HR agreement slightly decreased (ICC\u2009=\u2009.94, mean bias\u2009=\u2009\u22122.35), and root mean square of successive difference showed a marked reduction to poor agreement (ICC\u2009=\u2009\u2212.24, mean bias\u2009=\u2009+17.6\u00a0milliseconds). After applying the filtering to the running HRV data, the agreement remained poor (ICC\u2009=\u2009.13, mean bias\u2009=\u2009\u22125.1\u00a0milliseconds). <jats:italic><jats:bold>Conclusions<\/jats:bold>:<\/jats:italic> The Coospo H808S is a low-cost valid alternative to the Polar H10 for HR and HRV assessments in resting conditions and HR during running, but it presents divergences during low-intensity running for time-domain vagally related HRV indices. Researchers and practitioners should be cautious when using HRV data from low-cost monitors in dynamic conditions.<\/jats:p>","DOI":"10.1123\/ijspp.2025-0126","type":"journal-article","created":{"date-parts":[[2025,7,4]],"date-time":"2025-07-04T13:38:52Z","timestamp":1751636332000},"page":"1300-1305","source":"Crossref","is-referenced-by-count":0,"title":["Limited Validity of the Low-Cost Coospo H808S Heart-Rate Monitor Compared to the Polar H10"],"prefix":"10.1123","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4666-3531","authenticated-orcid":true,"given":"Gabriel","family":"Protzen","sequence":"first","affiliation":[{"name":"Faculty of Physical Activity and Sports Sciences, Universidad de Le\u00f3n, Le\u00f3n, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-7522-0100","authenticated-orcid":true,"given":"Jos\u00e9","family":"Riesco-Villar","sequence":"additional","affiliation":[{"name":"Faculty of Physical Activity and Sports Sciences, Universidad de Le\u00f3n, Le\u00f3n, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-9132-1234","authenticated-orcid":true,"given":"Alejandro","family":"Gonz\u00e1lez-Fern\u00e1ndez","sequence":"additional","affiliation":[{"name":"Faculty of Physical Activity and Sports Sciences, Universidad de Le\u00f3n, Le\u00f3n, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-6985-3263","authenticated-orcid":true,"given":"Aaron","family":"Escribano-Pascual","sequence":"additional","affiliation":[{"name":"Faculty of Physical Activity and Sports Sciences, Universidad de Le\u00f3n, Le\u00f3n, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8477-127X","authenticated-orcid":true,"given":"Daniel","family":"Boullosa","sequence":"additional","affiliation":[{"name":"Faculty of Physical Activity and Sports Sciences, Universidad de Le\u00f3n, Le\u00f3n, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"100","reference":[{"issue":"10","key":"r1","series-title":"Int J Sports Physiol Perform","doi-asserted-by":"publisher","first-page":"1324","DOI":"10.1123\/ijspp.2016-0668","article-title":"Comparison of heart-rate-variability recording with smartphone photoplethysmography, Polar H7 chest strap, and electrocardiography","volume":"12","author":"Plews DJ","year":"2017","unstructured":"Plews DJ, Scott B, Altini M, Wood M, Kilding AE, Laursen PB. 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