L. A. Tarskaia’s research while affiliated with Russian Academy of Sciences and other places

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Publications (50)


The Indigenous Siberian Health and Adaptation Project: implications of Epstein-Barr Virus infection for thyroid health and autoimmunity among an indigenous circumpolar population
  • Article

March 2015

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11 Reads

American Journal of Human Biology

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L. A. Tarskaia

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[...]

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J. J. Snodgrass

Implications of Epstein-Barr Virus infection for thyroid health and autoimmunity among an indigenous circumpolar population
  • Conference Paper
  • Full-text available

January 2015

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85 Reads

Download

Seasonal Variation in Basal Metabolic Rates Among the Yakut (Sakha) of Northeastern Siberia

July 2014

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161 Reads

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58 Citations

American Journal of Human Biology

Objectives: Previous research has shown that indigenous circumpolar populations have elevated basal metabolic rates (BMRs), yet few studies have explored whether metabolic rates increase during the winter. This study addresses this gap by examining seasonal variation in BMR and its associations with thyroid function and lifestyle factors among the Yakut (Sakha) of Siberia. Methods: Anthropometric dimensions, BMR, and thyroid hormone levels (free triiodothyronine [fT3], free thyroxine [fT4], thyroid-stimulating hormone [TSH]) were measured on two occasions (July/August, 2009 and January 2011) on a sample of 94 Yakut (Sakha) adults (35 men, 59 women) from the rural village of Berdygestiakh, Sakha Republic, Russia. Results: Seasonal changes in BMR varied by age. Younger Yakut adults (19-49 years) showed significant elevations in winter-time BMR of 6% (P < 0.05), whereas older individuals (≥50 years) showed modest declines (2%; n.s.). Both younger and older Yakut men and women showed increased respiratory quotients during the winter. FT3 and fT4 levels significantly declined during the winter in both younger and older Yakut men and women (P < 0.05). Lifestyle factors were significant predictors of BMR variation, particularly among older men and women. Conclusions: Among the Yakut, increased wintertime BMR was observed among younger but not older adults, whereas all adults showed sharp reductions in free thyroid hormone levels during the winter. Among men, greater participation in subsistence activities was associated with increased BMRs and greater fat oxidation. Among women, variation in food use had the strongest impact on metabolic function.



Metabolic syndrome and socioeconomic status in indigenous Siberian adults.

April 2013

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9 Reads

Physical activity has been linked to improved health among Western populations; however, little is known about the relationship among indigenous populations who combine traditional subsistence activities with more sedentary/market lifestyles. This study examines the relationship between physical activity and selected biomarkers of cardiovascular health in a sample of 75 Yakut adults (41 men) who have been undergoing the transition to a wage/market economy since the fall of the Soviet Union. Physical activity was objectively estimated using indirect calorimetry to predict activity energy expenditure (AEE: kcal/d) and accelerometry. Women had significantly lower AEE but not lower accelerometry counts than men. Multiple linear regressions were performed on men and women separately with biomarkers as the dependent variables and physical activity measures, age and percent body fat as the independent variables. Neither measure of physical activity predicted any of the biomarkers in women. In men, AEE was positively associated with high density lipoproteins (HDL) and inversely related to Epstein-Barr virus (EBV) antibodies. Accelerometry counts were negatively associated with C-reactive protein (CRP) and EBV and positively associated with total, HDL and low density lipoproteins (LDL) cholesterol. In men, physical activity appears to reduce the risk for negative health outcomes, predicting lower immune activity and higher levels of the “good” cholesterol and is linked with lower inflammation, though also predicting higher levels of all plasma cholesterols. Overall, physical activity appears to predict improved health in these Yakut men but not for the women, though the reasons behind this sex difference have yet to be investigated.







Citations (21)


... Research among the Yakut, for example, has documented modest physical activity levels, with particularly low levels among those least involved with the subsistence herding economy and those consuming more market foods (Snodgrass et al. 2006b). Furthermore, low activity levels in this population have been linked to several health measures, including chronic inflammation and poor lipid profiles (Wilson et al. 2013). ...

Reference:

Health of Indigenous Circumpolar Populations
The Indigenous Siberian Health and Adaptation Project: Physical activity and markers of cardiovascular health in the Yakut (Sakha)
  • Citing Article
  • March 2013

American Journal of Human Biology

... More recent research confirmed the systematic elevation of BMR among indigenous Arctic populations, but to a lesser extent. Values ranging from 7% to 19% above the predicted values for males, and from 3% to 17% for females, have been reported by several authors (Katzmarzyk et al., 1994;Galloway et al., 2000;Leonard et al., 2002Leonard et al., , 2005Snodgrass et al., 2005). This metabolic response is shaped by elevating the production of thyroid hormones and sensitivity to them, through short-term acclimatization and genetic adaptations (see Leonard et al., 2005 and references therein). ...

Health and economic modernization in the Yakut (Sakha) of Siberia.
  • Citing Article
  • March 2005

American Journal of Human Biology

... These secular trends, however, provide only a partial explanation for variation in metabolic and cardiovascular health among northern communities. Previous work among indigenous circumpolar populations indicates that transitions in metabolic and cardiovascular health are structured by the interaction of lifestyle changes and biological adaptations to local ecological stressors (Cepon et al., 2011;Fumagalli et al., 2015;Leonard et al., 2009;Levy et al., 2012;Snodgrass et al., 2007Snodgrass et al., , 2008. Arctic environments are characterized by extreme seasonal changes in temperature and day length and low overall energy availability. ...

The Indigenous Siberian Health and Adaptation Project: Seasonality in thyroid function and metabolic health among the Yakut (Sakha) of Eastern Siberia
  • Citing Article
  • March 2012

American Journal of Human Biology

... Brown adipose tissue activates in specific areas of the fat when animals or humans are exposed to the cold [2]. A number of researchers have found indirect evidence of activity of BAT in inhabitants of regions with extremely cold climates [1,6]. However, despite the many indirect signs of activation of brown adipose tissue in adult residents of regions with extremely cold climates, up to date, the fact was not confirmed by histology and morphology verification of BAT. ...

An assessment of infrared thermal imaging as an indirect method for quantifying variation in brown adipose tissue using data from the Indigenous Siberian Health and Adaptation Project
  • Citing Article
  • March 2014

American Journal of Human Biology

... However, observations of long-term changes in endocrine levels in individuals living in polar environments have found a decrease in FT3, with no significant changes detected in FT4 and TSH levels. Pathogenic analysis indicates that prolonged exposure to cold significantly raises both the internal production and clearance rates of FT3 [32][33][34]. The study area, Hulunbuir City, situated near the inland arctic region of China, frequently experiences polar cyclones, suggesting that residents exposed to cold conditions may similarly experience fluctuations in FT3 levels. ...

Seasonal Variation in Basal Metabolic Rates Among the Yakut (Sakha) of Northeastern Siberia
  • Citing Article
  • July 2014

American Journal of Human Biology

... Besides their cultural particularities (Turkic-speakers, cattle/ horse-breeders living among reindeer-breeders, Tungus speakers), previous studies have shown distinctive genetic features. They present a low genetic diversity, possibly due to a population bottleneck or founder effect, and affinities with southern Siberian populations [1][2][3]. ...

Ethnogenetics of Yakuts from Three Regions of Republic' of Sakha (Yakutia) Inferred from the Frequencies of Biochemical Gene Markers
  • Citing Article
  • January 2002

Russian Journal of Genetics

... In fact, the Yakut population is characterized by a high degree of genetic homogeneity due to geographical isolation and low migration. These factors determined the founder effect and a high frequency of hereditary diseases [7,11,12]. ...

The Structure and Diversity of Hereditary Pathology in Sakha Republic (Yakutia)

Russian Journal of Genetics

... Concerning Yakut history, the Yakut progressive expansion within Yakutia from the area defined by the Lena, Amga, and Aldan rivers (Central Yakutia) gave birth to at least four pockets of Yakut settlements stated on Russian ethno-historic maps (Beffa & Delaby 1994) of the 17 th century. This process may have led to a regional variation as supported by linguistic (Pakendorf 2007) and surname analyses, but also a biological survey based on the polymorphisms of classical markers (Evsyukov et al. 2005). Exploring the genetic variation among these Yakut settlements (Amga-Lena in the Centre and Viljuj in the West) may be relevant to understand the migration process that occurred during Yakut's expansion (Supplementary Fig. 1). ...

The Population Gene Pool of Yakutia: Cartographic Analysis Based on the Polymorphism of Biochemical Markers and the AB0 System
  • Citing Article
  • October 2005

Russian Journal of Genetics

... In 2009, Flegontova et al. studied various restriction fragment length polymorphisms (RFLP) such as TaqIB, BclI, MboI, TaqID, and TaqI A, in 17 contemporary populations of the East European Plain and Siberia. They reported that the T allele at the rs2234690 (MboI) locus was the most frequent allele in Asian populations (Flegontova et al., 2009). ...

Haplotype frequencies at the DRD2 locus in populations of the East European Plain

BMC Genetics

... За допомогою прізвищ було проаналізовано структуру популяцій багатьох країн і етнічних груп різних народів світу. Ці дослідження проведені як на індивіду-альному, так і на популяційному рівні [2][3][4][5][6][7][8][9][10][11]. Наші попередні дослідження продемонстрували ефективність використання прізвищ у вивченні українських популяцій. ...

Surnames in Siberia: A Study of the Population of Yakutia Through Isonymy
  • Citing Article
  • February 2009

American Journal of Physical Anthropology