Nenenko N.D., PhD, Associate Professor
Yugra State University, Khanty-Mansiysk

Stogov M.V., Dr. Biol., Associate Professor
Yugra State University, Khanty-Mansiysk

Duzhenko A.S.
Yugra State University, Khanty-Mansiysk

Kamalova M.F.
Yugra State University, Khanty-Mansiysk

Objective of the study was to evaluate physiological and psychological changes in girls involved in strength fitness while taking polyunsaturated fatty acids (PUFA) and vitamin E.
Methods and structure of the study. The scientific work involved 30 girls who were engaged in a fitness program for the development of strength qualities. The girls of the main group (n=15) took PUFA and vitamin E one capsule per day for 90 days. The girls of the control group (n=15) did not use dietary supplements. The subjects were examined before the study, a day later and 30 days after the last session.
Results and conclusions. It was found that the girls in the main group showed a more significant decrease in fat mass, an increase in muscle mass and vital capacity of the lungs compared to the control group. The use of the studied supplements contributed to the restoration of skeletal muscles after exercise. The girls in the main group also showed a more pronounced increase in the assessment of the overall quality of life compared to the girls in the control group. The authors conclude that the use of PUFA and vitamin E in strength fitness classes contributed to the increased effectiveness of the program in the girls in the target group.

Keywords: strength fitness, sports nutrition, polyunsaturated fatty acids, vitamin E, girls.

References

1. Lyudinina, A. Yu., Garnov, I. O., & Boyko, E. R. (2021). Nezamenimyye zhirnyye kisloty v ratsione lyzhnikov-gonshchikov: rol v povyshenii fizicheskoy rabotosposobnosti [Essential fatty acids in the diet of cross-country skiers: role in improving physical performance]. Ekologiya cheloveka, 9, 27-33.
2. Miroshnikov, A. B., Meshtel, A. V., & Rybakova, P. D. (2024). Vliyaniye dobavok omega-3 na rost myshechnoy massy: zontichnyy obzor sistematicheskikh obzorov randomizirovannykh kontroliruyemykh issledovaniy [The effects of omega-3 supplements on muscle growth: An umbrella review of systematic reviews of randomized controlled trials]. Teoriya i metodika fizicheskoy kultury, 2, 102-108.
3. Fedorova, E. P., Minyaylo, L. A., Korchina, T. Ya., & Korchin, V. I. (2023). Otsenka postupleniya mikronutriyentov s pishchey u sportsmenov tsiklicheskikh vidov sporta, prozhivayushchikh na severe [Assessment of micronutrient intake with food in athletes of cyclic sports living in the north]. Voprosy diyetologii, 1, 5-10.
4. Lakshimi, V. I., & Kavitha, M. (2023). New insights into prospective health potential of ω-3 PUFAs. Current Nutrition Reports, 12(4), 813-829.
5. Posnakidis, G., Giannaki, C. D., Mougios, V., et al. (2024). Effects of supplementation with omega-3 and omega-6 polyunsaturated fatty acids and antioxidant vitamins, combined with high-intensity functional training, on exercise performance and body composition: A randomized, double-blind, placebo-controlled trial. Nutrients, 16(17), 2914. 
6. de Souza, R. A. S., da Silva, A. G., de Souza, M. F., et al. (2021). A systematic review of CrossFit® workouts and dietary and supplementation interventions to guide nutritional strategies and future research in CrossFit®. International Journal of Sport Nutrition and Exercise Metabolism, 31(2), 187-205.
7. Tomczyk, M., Heileson, J. L., Babiarz, M., & Calder, P. C. (2023). Athletes can benefit from increased intake of EPA and DHA-evaluating the evidence. Nutrients, 15(23), 4925. 
8. Tsuchiya, Y., Ueda, H., Yanagimoto, K., et al. (2021). 4-week eicosapentaenoic acid-rich fish oil supplementation partially protects muscular damage following eccentric contractions. Journal of the International Society of Sports Nutrition, 18(1), 18.