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Nutrients. 2019 Aug 21;11(9). pii: E1960. doi: 10.3390/nu11091960.

The Dependence of Running Speed and Muscle Strength on the Serum Concentration of Vitamin D in Young Male Professional Football Players Residing in the Russian Federation.

Author information

1
Department of Sport Medicine and Medical Rehabilitation, Sechenov First Moscow State Medical University, 119435 Moscow, Russia.
2
Department of Sport Medicine and Medical Rehabilitation, Faculty of Continuing Professional Education, Sechenov First Moscow State Medical University, 119435 Moscow, Russia.
3
FC Zenit Saint-Petersburg, 197341 Saint Petersburg, Russia.
4
«Smart Recovery» Sports Medicine Clinic, 121552 Moscow, Russia.
5
Institute of Sport Science, Jerzy Kukuczka Academy of Physical Education, 40-065 Katowice, Poland.
6
Department of Sports Training, Jerzy Kukuczka Academy of Physical Education, 40-065 Katowice, Poland.
7
Department of Physiological and Medical Sciences, Jerzy Kukuczka Academy of Physical Education, 40-065 Katowice, Poland.
8
Exercise Physiology Laboratory, 18450 Nikaia, Greece.
9
School of Health and Caring Sciences, University of West Attica, 11244 Athens, Greece.
10
Institute of Primary Care, University of Zurich, 8091 Zurich, Switzerland.
11
Institute of Primary Care, University of Zurich, 8091 Zurich, Switzerland. beat.knechtle@hispeed.ch.
12
Medbase St. Gallen Am Vadianplatz, 9001 St. Gallen, Switzerland. beat.knechtle@hispeed.ch.

Abstract

Background: Vitamin D insufficiency is prevalent among athletes, and it can negatively affect physical performance. At the same time, most of the available data were obtained from untrained individuals of various ages, and published studies performed in athletes led to contradictory conclusions. Methods: This cohort prospective study examined the serum concentration of 25-hydroxycalciferol (25(OH)D) and its association with running speed and muscle power in 131 young football players (mean age 15.6 ± 2.4 years). Results: 25(OH)D levels were below reference in 42.8% (serum 25(OH)D <30 ng/mL) and above reference in 30.5% of the participants (serum 25(OH)D 61-130 ng/mL). A comparison of the results of 5, 15, and 30 m sprint tests and the standing long jump test found no statistically significant differences between the two groups. Athletes from the 25(OH)D-insufficient group were treated with 5000 IU cholecalciferol supplement daily for 60 days. After the treatment, the 25(OH)D concentration increased by 79.2% and was within reference in 84% of the treated athletes (serum 25(OH)D 30-60 ng/mL). Testing was repeated after the end of treatment, and a statistically significant increase in the results of the 5, 15, and 30 m sprint tests was observed (Cohen's d was 0.46, 0.33, and 0.34, respectively), while the results of the standing long jump test remained unchanged. Body height, body weight, and lean body mass of the football players also increased. Conclusions: These findings indicate that there is likely no correlation between serum levels of 25(OH)D, muscle power, and running speed in young professional football players, and the changes observed post-treatment might have been caused by changes in the anthropometric parameters. During the study, all the anthropometric parameters changed, but the amount of lean body mass only correlated with the results of the 5 m sprint.

KEYWORDS:

cholecalciferol; muscle power and speed; treatment for vitamin D deficiency; vitamin D deficiency; vitamin D3; young football players

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