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Previous work among indigenous and non\u2010indigenous populations in Russia revealed that there are seasonal shifts in TH dynamics such that total and free triiodothyronine (fT<jats:sub>3<\/jats:sub>) and free thyroxine (fT<jats:sub>4<\/jats:sub>) increase during winter. Elevated TH levels in these populations were positively correlated with the elevated resting metabolic rate (RMR) commonly seen among indigenous cold climate populations.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Here we examined the relationship between TH levels (fT3, fT4, and thyroid stimulating hormone) and resting metabolism among reindeer herders (<jats:italic>N<\/jats:italic>\u2009=\u200935) and office workers (<jats:italic>N<\/jats:italic>\u2009=\u200916) from northern Finland in January 2019 and February of 2023. RMR was measured using indirect calorimetry at both time points and a TH analysis was conducted from venous blood samples collected before RMR measurements in 2023 only.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Controlling for fat free mass, female reindeer herders had significantly higher RMRs than male reindeer herders and significantly higher RMRs than predictive equation estimates. Female herders also had significantly higher fT<jats:sub>3<\/jats:sub> and TSH than male herders and female officer workers. Female herders exhibited a significant positive correlation between fT<jats:sub>4<\/jats:sub> and RMR; significant correlations were not found among male herders or female office workers.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>This preliminary study demonstrates variation in the relationship between TH levels and resting metabolism among reindeer herders and office workers in Northern Finland. These results highlight potential sex\u2010based differences in TH and metabolism dynamics, particularly among female reindeer herders, that require further research.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ajhb.70092","type":"journal-article","created":{"date-parts":[[2025,6,21]],"date-time":"2025-06-21T01:39:36Z","timestamp":1750469976000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Higher Resting Metabolism Is Associated With Increased Free Triiodothyronine Among Female Reindeer Herders in\u00a0Northern Finland"],"prefix":"10.1002","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6949-2029","authenticated-orcid":false,"given":"Cara","family":"Ocobock","sequence":"first","affiliation":[{"name":"Department of Anthropology University of Notre Dame  Notre Dame Indiana USA"},{"name":"Eck Institute for Global Health Institute for Educational Initiatives, University of Notre Dame  Notre Dame Indiana USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ville","family":"Stenb\u00e4ck","sequence":"additional","affiliation":[{"name":"Department of Anthropology University of Notre Dame  Notre Dame Indiana USA"},{"name":"Research Unit of Biomedicine and Internal Medicine University of Oulu  Oulu Finland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alexandra M.","family":"Niclou","sequence":"additional","affiliation":[{"name":"US Army Research Institute of Environmental Medicine  Natick Massachusetts USA"},{"name":"Oak Ridge Institute for Science and Education  Oak Ridge Tennessee USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"P\u00e4ivi","family":"Soppela","sequence":"additional","affiliation":[{"name":"Arctic Centre, University of Lapland  Rovaniemi Finland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Minna","family":"Turunen","sequence":"additional","affiliation":[{"name":"Arctic Centre, University of Lapland  Rovaniemi Finland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jaroslaw","family":"Walkowiak","sequence":"additional","affiliation":[{"name":"Pediatric Gastroenterology and Metabolic Diseases Pediatric Institute, Poznan University of Medical Sciences  Pozna\u0144 Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Karl\u2010Heinz","family":"Herzig","sequence":"additional","affiliation":[{"name":"Research Unit of Biomedicine and Internal Medicine University of Oulu  Oulu Finland"},{"name":"Pediatric Gastroenterology and Metabolic Diseases Pediatric Institute, Poznan University of Medical Sciences  Pozna\u0144 Poland"},{"name":"Medical Research Center Oulu University Hospital  Oulu Finland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,6,20]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/S10902\u2010005\u20105563\u20102\/METRICS"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/J.JTEMB.2014.04.009"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1530\/EJE\u201011\u20100888"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/CEN.12744"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1210\/JCEM.87.3.8165"},{"key":"e_1_2_10_7_1","first-page":"18","volume-title":"Energy Transformations in Cells and Organisms","author":"Berry M.","year":"1989"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1134\/S0362119708020126"},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1007\/S00484\u2010015\u20101069\u20108"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jhevol.2022.103268"},{"key":"e_1_2_10_11_1","doi-asserted-by":"publisher","DOI":"10.1007\/S42000\u2010023\u201000435\u20109"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.1079\/BJN19740060"},{"key":"e_1_2_10_13_1","unstructured":"Eurola M. 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