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Adaptive reactions of the endocrine system of children living under conditions of contrasting photoperiods

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Abstract

Age-related changes in the levels of pituitary, thyroid, and sex hormones and their dependence on the day length were studied in 242 healthy 10-to 16-year-old boys born and permanently living in the southern part of Arkhangel’sk oblast. It was found that the serum levels of thyroid hormones, gonadotropins, and sex steroids underwent circannual changes. The minimum concentrations of thyroxine, testosterone, and estradiol and the maximum concentrations of triiodothyronine, lutcinizing and follicle-stimulating hormones, and progesterone were associated with the shortest days. In contrast, the longest days were associated with the maximum concentrations of thyroxine, testosterone, and estradiol and the minimum concentrations of triiodothyronine, luteinizing and follicle-stimulating hormones, and progesterone. A factor dependence of the thyroxine, triiodothyronine, testosterone, estradiol, and prolactin concentrations on the day length was found in the group examined. This dependence was more pronounced during the second half of adolescence.

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Authors and Affiliations

  1. Institute of Environmental Physiology of Natural Adaptations, Ural Division, Russian Academy of Sciences, Arkhangel’sk, 163061, Russia

    R. V. Koubasov, D. B. Demin & A. V. Tkachev

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  1. R. V. Koubasov
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  2. D. B. Demin
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  3. A. V. Tkachev
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Original Russian Text © R.V. Koubasov, D.B. Demin, A.V. Tkachev, 2006, published in Fiziologiya Cheloveka, 2006, Vol. 32, No. 4, pp. 89–96.

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Koubasov, R.V., Demin, D.B. & Tkachev, A.V. Adaptive reactions of the endocrine system of children living under conditions of contrasting photoperiods. Hum Physiol 32, 450–456 (2006). https://doi.org/10.1134/S0362119706040116

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