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Physiological and Morphological Specific Features of the Formation of the Thyroid Status in the Aboriginal and Migrant Populations of Magadan Oblast

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Abstract

Ultrasonographic determinations of the thyroid gland volumes and measurement of the blood plasma content of thyroxin and triiodothyronine were carried out in 1176 apparently healthy residents of the Magadan oblast, all those examined being divided by sex, age, and the adaptation time in the North. Special attention was given to the thyroid system parameters of the aborigines 17 to 40 years old living in the urban area and not involved in the traditional life style. The indigenous population of the Extreme North and migrants were shown to have marked functional adaptive hyperplasia of the thyroid gland and diffuse goiter in 15% of cases. The size of the thyroid gland and the level of the thyroid hormones in the aboriginal population are within the average European range. Diffuse goiter manifestations in males virtually do not occur; in women, the incidence does not exceed 5%. The assumption is advanced as to the formation in aborigines of the “northern hypothyroid phenotype” providing for the sustained optimal level of the thyroid system functioning without an increase in the thyroid volume.

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  1. Arktika International Research Center, Far East Division, Russian Academy of Sciences, Magadan, Russia

    A. L. Maksimov & A. L. Gorbachev

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  1. A. L. Maksimov
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  2. A. L. Gorbachev
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Maksimov, A.L., Gorbachev, A.L. Physiological and Morphological Specific Features of the Formation of the Thyroid Status in the Aboriginal and Migrant Populations of Magadan Oblast. Human Physiology 27, 461–467 (2001). https://doi.org/10.1023/A:1010971005052

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