Functional hypocalcemia as a probable trigger for bone mass growth in skiers

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PhD, Associate Professor R.V. Kuchin1
Dr. Biol., Associate Professor M.V. Stogov1
PhD, Associate Professor N.D. Nenenko1
Associate Professor T.A. Maksimova1
1Yugra State University, Khanty-Mansiysk

Objective of the study was to evaluate changes in calcium balance and its effect on bone tissue metabolism in girls involved in cross-country skiing.
Methods and structure of the study. The work involved 22 female students, aged 19-21 years, from which two groups were formed: group 1 (control, n=8) - girls who do not regularly go in for physical education and/or sports; group 2 (main, n=14) – girls involved in cross-country skiing, 3-7 years of sports experience. All girls underwent densitometry of skeletal and spinal segments (end of the season/May) and biochemical examination of blood serum (twice: at the beginning and end of the season, September/May). In blood serum, the concentration of calcium (total and ionized), C-terminal telopeptide type I collagen, osteocalcin, parathyroid hormone (PTH), as well as the activity of the bone isoenzyme of alkaline phosphatase were determined.
Results and conclusions. It was found that by the end of the season in the girls of group 2, the level of ionized calcium in the blood serum significantly (p<0.05) decreased, the level of osteocalcin and PTH increased, both relative to the pre-season values ​​and relative to the values ​​of the peers of group 1. The observed hypocalcemia in the girls of the group 2 can be regarded as a trigger underlying the physiological, post-exercise stimulation of osteogenesis. Monitoring of the level of ionized calcium in the interseasonal period can be a fairly affordable and effective test for predicting probable bone tissue disorders in girls involved in cross-country skiing.

Keywords: cross-country skiing, girls, calcium, bone mineral density, osteogenesis.

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