{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,19]],"date-time":"2026-02-19T05:34:37Z","timestamp":1771479277196,"version":"3.50.1"},"reference-count":0,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2024,6,26]],"date-time":"2024-06-26T00:00:00Z","timestamp":1719360000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Portuguese Foundation for Science and Technology (FCT)","doi-asserted-by":"publisher","award":["PCIF\/SSO\/0017\/2018"],"award-info":[{"award-number":["PCIF\/SSO\/0017\/2018"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001871","name":"Portuguese Foundation for Science and Technology (FCT)","doi-asserted-by":"publisher","award":["UIDB\/00690\/2020"],"award-info":[{"award-number":["UIDB\/00690\/2020"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001871","name":"Portuguese Foundation for Science and Technology (FCT)","doi-asserted-by":"publisher","award":["UIDP\/00690\/2020"],"award-info":[{"award-number":["UIDP\/00690\/2020"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001871","name":"Portuguese Foundation for Science and Technology (FCT)","doi-asserted-by":"publisher","award":["LA\/P\/0007\/2020"],"award-info":[{"award-number":["LA\/P\/0007\/2020"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"name":"National funds via FCT\/MCTES (PIDDAC)","award":["PCIF\/SSO\/0017\/2018"],"award-info":[{"award-number":["PCIF\/SSO\/0017\/2018"]}]},{"name":"National funds via FCT\/MCTES (PIDDAC)","award":["UIDB\/00690\/2020"],"award-info":[{"award-number":["UIDB\/00690\/2020"]}]},{"name":"National funds via FCT\/MCTES (PIDDAC)","award":["UIDP\/00690\/2020"],"award-info":[{"award-number":["UIDP\/00690\/2020"]}]},{"name":"National funds via FCT\/MCTES (PIDDAC)","award":["LA\/P\/0007\/2020"],"award-info":[{"award-number":["LA\/P\/0007\/2020"]}]},{"name":"SusTEC","award":["PCIF\/SSO\/0017\/2018"],"award-info":[{"award-number":["PCIF\/SSO\/0017\/2018"]}]},{"name":"SusTEC","award":["UIDB\/00690\/2020"],"award-info":[{"award-number":["UIDB\/00690\/2020"]}]},{"name":"SusTEC","award":["UIDP\/00690\/2020"],"award-info":[{"award-number":["UIDP\/00690\/2020"]}]},{"name":"SusTEC","award":["LA\/P\/0007\/2020"],"award-info":[{"award-number":["LA\/P\/0007\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Clocks &amp; Sleep"],"abstract":"<jats:p>Sleep is a vital process that impacts biological functions such as cell renewal, bone regeneration, and immune system support. Disrupted sleep can interrupt erythropoiesis, leading to fewer red blood cells, reduced haemoglobin concentration, and decreased haematocrit levels, potentially contributing to haematological disorders. This is particularly concerning for shift workers for example firefighters. While previous studies have explored sleep\u2019s adverse effects on various professions, research specific to firefighters is limited. This study investigates the relationship between sleep quality and haematological parameters among firefighters in Northeast Portugal. From a sample of 201 firefighters, variations in red blood cells, haemoglobin, and haematocrit values were linked to sleep quality. The study utilised non-parametric tests (Wilcoxon-Mann-Whitney, Spearman\u2019s correlation) to explore the connection between sleep quality and haematological profile. The impact of covariates on haematological parameters was assessed using non-parametric ANCOVA (Quade\u2019s). A multiple regression analysis was employed to further understand how sleep quality and various confounding variables impact haematological levels. Findings suggest a negative link between sleep quality and haematological levels, meaning that as sleep quality deteriorates, there is a tendency for haematological levels to decrease, as indicated by Spearman\u2019s correlation (rRBC = \u22120.157, pRBC = 0.026; rHb = \u22120.158, pHb = 0.025; rHCT = \u22120.175, pHCT = 0.013). As observed in scientific literature, the correlation found suggests a possible inhibition of erythropoiesis, the process responsible for red blood cell production. Despite firefighters presenting a haematological profile within the reference range (RBC: 5.1 \u00d7 106\/mm3 (SD \u00b1 0.4), Hb: 15.6 g\/dL (SD \u00b1 1.3), 47% (SD \u00b1 1.0), there is already an observable trend towards lower levels. The analysis of co-variables did not reveal a significant impact of sleep quality on haematological levels. In conclusion, this study underscores the importance of sleep quality in determining haematological parameters among firefighters. Future research should investigate the underlying mechanisms and long-term implications of poor sleep quality on firefighter health. Exploring interventions to enhance sleep quality is vital for evidence-based strategies promoting firefighter well-being.<\/jats:p>","DOI":"10.3390\/clockssleep6030021","type":"journal-article","created":{"date-parts":[[2024,6,28]],"date-time":"2024-06-28T05:22:38Z","timestamp":1719552158000},"page":"291-311","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["The Impact of Sleep on Haematological Parameters in Firefighters"],"prefix":"10.3390","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9149-5058","authenticated-orcid":false,"given":"Sara","family":"Alves","sequence":"first","affiliation":[{"name":"Instituto Polit\u00e9cnico de Bragan\u00e7a, Campus de Santa Apol\u00f3nia, 5300-253 Bragan\u00e7a, Portugal"}]},{"given":"Francisca","family":"Silva","sequence":"additional","affiliation":[{"name":"Department of Veterinary Sciences, University of Tr\u00e1s-os-Montes and Alto Douro, 5000-801 Vila Real, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9187-0279","authenticated-orcid":false,"given":"Filipa","family":"Esteves","sequence":"additional","affiliation":[{"name":"Environmental Health Department, National Institute of Health, Rua das Taipas 135, 4050-600 Porto, Portugal"},{"name":"EPIUnit, National Institute of Public Health, University of Porto, Rua das Taipas 135, 4050-600 Porto, Portugal"}]},{"given":"Solange","family":"Costa","sequence":"additional","affiliation":[{"name":"Environmental Health Department, National Institute of Health, Rua das Taipas 135, 4050-600 Porto, Portugal"},{"name":"EPIUnit, National Institute of Public Health, University of Porto, Rua das Taipas 135, 4050-600 Porto, Portugal"}]},{"given":"Klara","family":"Slezakova","sequence":"additional","affiliation":[{"name":"REQUIMTE\/LAQV, ISEP, Polytechnic of Porto, Rua Dr. Ant\u00f3nio Bernardino de Almeida, 4249-015 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8506-4393","authenticated-orcid":false,"given":"Maria","family":"Alves","sequence":"additional","affiliation":[{"name":"AquaValor-Centro de Valoriza\u00e7\u00e3o e Transfer\u00eancia de Tecnologia da \u00c1gua-Associa\u00e7\u00e3o, Rua Dr. J\u00falio Martins n.\u00ba 1, 5400-342 Chaves, Portugal"},{"name":"Centro de Investiga\u00e7\u00e3o de Montanha (CIMO), Instituto Polit\u00e9cnico de Bragan\u00e7a, Campus de Santa Apol\u00f3nia, 5300-253 Bragan\u00e7a, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8505-3432","authenticated-orcid":false,"given":"Maria","family":"Pereira","sequence":"additional","affiliation":[{"name":"LEPABE-ALiCE, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8693-5250","authenticated-orcid":false,"given":"Jo\u00e3o","family":"Teixeira","sequence":"additional","affiliation":[{"name":"Environmental Health Department, National Institute of Health, Rua das Taipas 135, 4050-600 Porto, Portugal"},{"name":"EPIUnit, National Institute of Public Health, University of Porto, Rua das Taipas 135, 4050-600 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6433-5801","authenticated-orcid":false,"given":"Simone","family":"Morais","sequence":"additional","affiliation":[{"name":"REQUIMTE\/LAQV, ISEP, Polytechnic of Porto, Rua Dr. Ant\u00f3nio Bernardino de Almeida, 4249-015 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1658-4509","authenticated-orcid":false,"given":"Ad\u00edlia","family":"Fernandes","sequence":"additional","affiliation":[{"name":"Research Centre for Active Living and Wellbeing (LiveWell), Instituto Polit\u00e9cnico de Bragan\u00e7a, Campus de Santa Apol\u00f3nia, 5300-253 Bragan\u00e7a, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6130-8381","authenticated-orcid":false,"given":"Felisbina","family":"Queiroga","sequence":"additional","affiliation":[{"name":"Department of Veterinary Sciences, University of Tr\u00e1s-os-Montes and Alto Douro, 5000-801 Vila Real, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6989-1169","authenticated-orcid":false,"given":"Josiana","family":"Vaz","sequence":"additional","affiliation":[{"name":"Centro de Investiga\u00e7\u00e3o de Montanha (CIMO), Instituto Polit\u00e9cnico de Bragan\u00e7a, Campus de Santa Apol\u00f3nia, 5300-253 Bragan\u00e7a, Portugal"},{"name":"Research Centre for Active Living and Wellbeing (LiveWell), Instituto Polit\u00e9cnico de Bragan\u00e7a, Campus de Santa Apol\u00f3nia, 5300-253 Bragan\u00e7a, Portugal"},{"name":"Laborat\u00f3rio Associado para a Sustentabilidade e Tecnologia em Regi\u00f5es de Montanha (SusTEC), Instituto Polit\u00e9cnico de Bragan\u00e7a, Campus de Santa Apol\u00f3nia, 5300-253 Bragan\u00e7a, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2024,6,26]]},"container-title":["Clocks &amp; Sleep"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2624-5175\/6\/3\/21\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T15:05:47Z","timestamp":1760108747000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2624-5175\/6\/3\/21"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,6,26]]},"references-count":0,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2024,9]]}},"alternative-id":["clockssleep6030021"],"URL":"https:\/\/doi.org\/10.3390\/clockssleep6030021","relation":{},"ISSN":["2624-5175"],"issn-type":[{"value":"2624-5175","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,6,26]]}}}