Effects of nutritional supplements on powerlifters with different types of autonomic regulation

Aim. The paper aims to identify the protective effect of a nutritional supplement on powerlifters with respect to the type of their autonomic regulation and their heart rate variability measurements. Materials and methods. The effect of a nutritional supplement (NPO PROBIO, Russia) on heart rate regulation in powerlifters (Candidates for Master of Sport, Masters of Sport, aged from 18 to 24 years, body length - 177.5 ± 6.91 cm, body weight - 84.1 ± 5.92 kg, n = 12) was studied. The subjects received the supplement for 30 days during the preparatory period of the annual cycle according to the proposed schedule. The effectiveness of the supplement was evaluated by body composition (bioimpedance analysis) and heart rate variability measurements, as well as strength fitness data (pedagogical methods). Results. It was found that our nutritional supplement improved body composition through an increase in muscle mass and a decrease in fat mass. There was a decrease in the stress of autonomic regulation in powerlifters with type I and III regulation. However, in athletes with type I and III regulation, the corrective effect was recorded before/after training and after strength training, respectively. The enhancement of autonomic regulation was more evident in type III regulation. Moreover, type III regulation demonstrated a greater increase in strength fitness. Conclusion. Powerlifters with a moderate dominance of autonomic regulation demonstrated a more pronounced effect of nutritional supplements confirmed by the data of body composition and strength fitness.