Elevated resting metabolic rates among female, but not male, reindeer herders from sub-arctic Finland
Objective: Elevated resting metabolic rates (RMR, kcal/day) are a well-established mechanism for maintaining core body temperature among cold climate populations. A high degree of interindividual variation has recently been noted among circumpolar populations. To further examine RMR variability, we...
Published in: | American Journal of Human Biology |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | https://research.ulapland.fi/fi/publications/1c188774-ccef-4560-af1e-410fc7c4d938 https://doi.org/10.1002/ajhb.23432 http://www.scopus.com/inward/record.url?scp=85087156735&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85087156735&partnerID=8YFLogxK |
id |
ftulaplandcdispu:oai:lacris.ulapland.fi:publications/1c188774-ccef-4560-af1e-410fc7c4d938 |
---|---|
record_format |
openpolar |
spelling |
ftulaplandcdispu:oai:lacris.ulapland.fi:publications/1c188774-ccef-4560-af1e-410fc7c4d938 2024-05-12T07:57:21+00:00 Elevated resting metabolic rates among female, but not male, reindeer herders from sub-arctic Finland Ocobock, Cara Soppela, Päivi Turunen, Minna Stenbäck, Ville Herzig, Karl-Heinz 2020-11-09 https://research.ulapland.fi/fi/publications/1c188774-ccef-4560-af1e-410fc7c4d938 https://doi.org/10.1002/ajhb.23432 http://www.scopus.com/inward/record.url?scp=85087156735&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85087156735&partnerID=8YFLogxK eng eng https://research.ulapland.fi/fi/publications/1c188774-ccef-4560-af1e-410fc7c4d938 info:eu-repo/semantics/closedAccess Ocobock , C , Soppela , P , Turunen , M , Stenbäck , V & Herzig , K-H 2020 , ' Elevated resting metabolic rates among female, but not male, reindeer herders from sub-arctic Finland ' , American Journal of Human Biology , vol. 32 , no. 6 , e23403 . https://doi.org/10.1002/ajhb.23432 /dk/atira/pure/person/fieldofscience2010/4/15 name=Other agricultural sciences article 2020 ftulaplandcdispu https://doi.org/10.1002/ajhb.23432 2024-04-14T23:46:20Z Objective: Elevated resting metabolic rates (RMR, kcal/day) are a well-established mechanism for maintaining core body temperature among cold climate populations. A high degree of interindividual variation has recently been noted among circumpolar populations. To further examine RMR variability, we investigated anthropometric and metabolic differences among reindeer herders from subarctic Finland. Methods: Resting metabolic rates, body mass, body composition, height, age, and sex were measured among 20 reindeer herders (5 females, 15 males, 20-64 years) from seven herding districts surrounding the Arctic Circle of Finland in January of 2019. Results: Females had a mean RMR of 1798 ± 216 kcal/day and males 1753 ± 503 kcal/day. When controlling for body mass and fat-free mass, females had significantly higher RMRs relative to males (P <.01). Contrary to previous cold climate population studies, measured RMR among males was not significantly different from predictive equation estimates (P >.05). However, predictive equations significantly underestimated female RMR by a mean of 25.2% ± 5.9% (P <.01). Conclusion: These results mirror earlier findings, though in ways previously unseen. In this population: (a) There is a high degree of RMR interindividual variability, but only among males, and (b) there is evidence for elevated RMR, but only among females. Though the sample size is small, preliminary results suggest the presence of sex-based differences in metabolic adaptations to cold climates within this population subset. Potential reasons for this sex-based difference are discussed including a presentation of a hypothesis about the dual role of thyroid hormone in both reproductive and metabolic processes. Article in Journal/Newspaper Arctic Arctic Subarctic LaCRIS - University of Lapland Current Research System Arctic American Journal of Human Biology 32 6 |
institution |
Open Polar |
collection |
LaCRIS - University of Lapland Current Research System |
op_collection_id |
ftulaplandcdispu |
language |
English |
topic |
/dk/atira/pure/person/fieldofscience2010/4/15 name=Other agricultural sciences |
spellingShingle |
/dk/atira/pure/person/fieldofscience2010/4/15 name=Other agricultural sciences Ocobock, Cara Soppela, Päivi Turunen, Minna Stenbäck, Ville Herzig, Karl-Heinz Elevated resting metabolic rates among female, but not male, reindeer herders from sub-arctic Finland |
topic_facet |
/dk/atira/pure/person/fieldofscience2010/4/15 name=Other agricultural sciences |
description |
Objective: Elevated resting metabolic rates (RMR, kcal/day) are a well-established mechanism for maintaining core body temperature among cold climate populations. A high degree of interindividual variation has recently been noted among circumpolar populations. To further examine RMR variability, we investigated anthropometric and metabolic differences among reindeer herders from subarctic Finland. Methods: Resting metabolic rates, body mass, body composition, height, age, and sex were measured among 20 reindeer herders (5 females, 15 males, 20-64 years) from seven herding districts surrounding the Arctic Circle of Finland in January of 2019. Results: Females had a mean RMR of 1798 ± 216 kcal/day and males 1753 ± 503 kcal/day. When controlling for body mass and fat-free mass, females had significantly higher RMRs relative to males (P <.01). Contrary to previous cold climate population studies, measured RMR among males was not significantly different from predictive equation estimates (P >.05). However, predictive equations significantly underestimated female RMR by a mean of 25.2% ± 5.9% (P <.01). Conclusion: These results mirror earlier findings, though in ways previously unseen. In this population: (a) There is a high degree of RMR interindividual variability, but only among males, and (b) there is evidence for elevated RMR, but only among females. Though the sample size is small, preliminary results suggest the presence of sex-based differences in metabolic adaptations to cold climates within this population subset. Potential reasons for this sex-based difference are discussed including a presentation of a hypothesis about the dual role of thyroid hormone in both reproductive and metabolic processes. |
format |
Article in Journal/Newspaper |
author |
Ocobock, Cara Soppela, Päivi Turunen, Minna Stenbäck, Ville Herzig, Karl-Heinz |
author_facet |
Ocobock, Cara Soppela, Päivi Turunen, Minna Stenbäck, Ville Herzig, Karl-Heinz |
author_sort |
Ocobock, Cara |
title |
Elevated resting metabolic rates among female, but not male, reindeer herders from sub-arctic Finland |
title_short |
Elevated resting metabolic rates among female, but not male, reindeer herders from sub-arctic Finland |
title_full |
Elevated resting metabolic rates among female, but not male, reindeer herders from sub-arctic Finland |
title_fullStr |
Elevated resting metabolic rates among female, but not male, reindeer herders from sub-arctic Finland |
title_full_unstemmed |
Elevated resting metabolic rates among female, but not male, reindeer herders from sub-arctic Finland |
title_sort |
elevated resting metabolic rates among female, but not male, reindeer herders from sub-arctic finland |
publishDate |
2020 |
url |
https://research.ulapland.fi/fi/publications/1c188774-ccef-4560-af1e-410fc7c4d938 https://doi.org/10.1002/ajhb.23432 http://www.scopus.com/inward/record.url?scp=85087156735&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85087156735&partnerID=8YFLogxK |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Subarctic |
genre_facet |
Arctic Arctic Subarctic |
op_source |
Ocobock , C , Soppela , P , Turunen , M , Stenbäck , V & Herzig , K-H 2020 , ' Elevated resting metabolic rates among female, but not male, reindeer herders from sub-arctic Finland ' , American Journal of Human Biology , vol. 32 , no. 6 , e23403 . https://doi.org/10.1002/ajhb.23432 |
op_relation |
https://research.ulapland.fi/fi/publications/1c188774-ccef-4560-af1e-410fc7c4d938 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1002/ajhb.23432 |
container_title |
American Journal of Human Biology |
container_volume |
32 |
container_issue |
6 |
_version_ |
1798837712733601792 |