Szukana fraza: [Opis = "Introduction. High\-intensity interval training \(HIIT\) has gained popularity as a quick and effective way to exercise, and the training consists of a short burst of intense exercise that precedes a period of rest or low intensity exercise. Aim of Study. The present study aimed to investigate the effect of an 8\-week HIIT program on the lipid profiles and hematological variables of young players. Material and Methods. A training program was introduced to 40 male players \[football \(n = 20\) and field hockey \(n = 20\)\]. The training set includes 2\-min intense sprint interval workout \(at 90\-95% of HRmax, work\:rest = 1 \: 1\) followed by a minute each of active recovery and complete rest continued for 8 weeks with 3 days\/week alterations. The lipid profiles, hematological variables, maximum oxygen uptake capacity \(VO2max\), and anaerobic power \(Wpeak\) of the participants were assessed following standard procedures. Results. A significant \(p < 0.001\) decrease was recorded in body fat% \(7.6%\), white blood cell \(9.2%\), red blood cell \(2.3%\), ferritin \(21.5%\), hemoglobin \(2.5%\), hematocrit \(2.3%\), total cholesterol \(7.5%\), triglycerides \(8.7%\), total cholesterol\/high\-density lipoprotein cholesterol \(14.2%\) and very\-low\-density lipoprotein cholesterol \(6.1%, p < 0.05\) after the introduction of the HIIT protocol. In turn, body weight \(1.1%\), body mass index \(1.1%\), highdensity lipoprotein cholesterol \(7.9%\), platelet \(5.9%\), mean corpuscular volume \(3.5%\), platelet\-to\-leukocyte \(16.7%\), VO2max \(13.6%\) and Wpeak \(11.6%\) were found to be significantly \(p < 0.001\) increased after the training. Conclusions. The 8\-week sprint HIIT protocol resulted in an improved endurance capacity and anaerobic power with an overall improvement in the lipid profiles of young athletes. The HIIT also contributed to a reduction in oxygen\-carrying capacity with increased erythrocytic hemolysis."]

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