The aim of this study was to determinate the eff ect of four weeks of HIT training and HMB-FAsupplementation on some anabolic hormones, cortisol, body composition, anaerobic power andstrength of young wrestlers. For this purpose, out of 70 young male bodybuilders, 60 wereselected as volunteers. Then 56 of them with an age range of 20 to 25 years and BMI (17 to 20)were randomly divided into four equal groups: a) HIT exercise group and HMB-FA supplement (14people) b) HIT exercise (14 N) c) placebo (14 people) d) control group (14 people). At the beginningand before the start of the study, all samples completed the personal satisfaction form in order toparticipate in the study and the device (body analysis) was used to assess body composition andtheir fasting blood sample was taken by a specialist for relevant tests. After grouping, at thebeginning and end of the study in order to determine the anaerobic power (Wingate test) and forstrength (Scott, dead lift and chest press) was taken and recorded. Subjects exercised HITconsisting of 6 30-second runs that started with 85 to 90% of maximum heart rate and reached 90to 95% of maximum heart rate in the fi nal week. The method of taking HMB-FA supplement wasthat the subjects received 3 grams of HMB-FA supplement per kilogram of body weight daily.Viking force brand supplement was prepared. The placebo group received the same amount ofcellulose in uniform capsules. After the exercises, the test (body composition) and blood samplingwere performed by a specialist and the necessary factors were measure in the laboratory. Theresults of repeated measures analysis of variance showed that muscle strength, anaerobic power,growth hormone, IGF-1 and testosterone to cortisol ratio in the supplement group signifi cantlyincreased compared to the other groups and fat percentage decreased signifi cantly. Conclusion:Overall, it can be stated that HMB helps increase muscle mass and reduces body fat by aff ectingand most likely by increasing anabolic hormones and reducing the catabolic eff ects of cortisol.

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