ArticleAmerican journal of human biology : the official journal of the Human Biology Council2025
Higher Resting Metabolism Is Associated With Increased Free Triiodothyronine Among Female Reindeer Herders in Northern Finland.
Article in American journal of human biology : the official journal of the Human Biology Council, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed.
- Contributions of Roy J. Shephard to the Study of Circumpolar Human Biology and Health.American journal of human biology : the official journal of the Human Biology Council · 2025Article
- The Ecology and Human Biology of Pastoralists: Building on the Contributions of Michael A. Little.American journal of human biology : the official journal of the Human Biology Council · 2025Article
- Higher Resting Metabolism Is Associated With Increased Free Triiodothyronine Among Female Reindeer Herders in Northern Finland.American journal of human biology : the official journal of the Human Biology Council · 2025Article
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7 authors.
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Abstract
backgroundThyroid hormones (TH) regulate metabolism and are shaped by environmental factors-ambient temperature in particular. Previous work among indigenous and non-indigenous populations in Russia revealed that there are seasonal shifts in TH dynamics such that total and free triiodothyronine (fT
methodsHere we examined the relationship between TH levels (fT3, fT4, and thyroid stimulating hormone) and resting metabolism among reindeer herders (N = 35) and office workers (N = 16) 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.
resultsControlling 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
conclusionThis 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-based differences in TH and metabolism dynamics, particularly among female reindeer herders, that require further research.
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