EFFECT OF SUPPLEMENTATION OF DIFFERENT TYPES OF CREATINE ON ACUTE STRENGTH

Dodaci u prehrani koriste se na svim razinama sporta, a njihov sastav čine minerali, vitamini, aminokiseline, tvari poput enzima i metabolita. Jedno od najučinkovitijih ergogenih pomagala je suplementacija kreatinom. Suplementacija dovodi do povećavanja mišićne mase i cjelokupnog kapaciteta treninga visokog intenziteta. Povećanje mišićne mase povezano je s uspješnijom izvedbom vježbi kao i adaptacijom sportaša na zahtjevnije treninge. Kreatin monohidrat je najčešći oblik kreatina korišten u istraživanjima. Sličan je ili identičan endogenom kreatinu, a popularan način suplementacije kreatina također je i njegova kombinacija s ugljikohidratima ili proteinima i ugljikohidratima. Primarni cilj ovog diplomskog rada bio je uz pomoć dinamometra utvrditi jakost u mišićima gornjih i donjih udova (m. biceps brachii i m. quadriceps femoris), te utvrditi utječe li konzumacija kreatina na akutnu jakost bez primjene treninga, te postoje li razlike u vrsti konzumiranog kreatina. U ovom istraživanju korištena su dva oblika kreatina: kreatin monohidrat i kreatin kompleks. Najdjelotvorniji učinak na akutnu jakost m. biceps brachii pokazao je protokol suplementacije kreatin kompleksom, dok se implementacija kreatin monohidratom pokazala najučinkovitijom pri djelovanju na m. quadriceps femoris. Konzumacija suplemenata u odabranim količinama i vremenu implementacije nije rezultirala statističkim značajnim povećanjem akutne jakosti mišića m. biceps brachii i m. quadriceps femoris.Nutritional supplements are used at all levels of sports, and their composition consists of minerals, vitamins, amino acids, substances such as enzymes and metabolites. One of the most effective ergogenic aids is creatine supplementation. Supplementation leads to an increase in muscle mass and overall high-intensity training capacity. An increase in muscle mass is associated with a more successful performance of exercises as well as the adaptation of athletes to more demanding training. Creatine monohydrate is the most common form of creatine used in research. It is similar or identical to endogenous creatine, and a popular way of supplementing creatine is also its combination with carbohydrates or proteins and carbohydrates. The primary goal of this thesis was to determine ,with the help of a dynamometer, the strength in the muscles of the upper and lower limbs (m. biceps brachii and m. quadriceps femoris), and to determine whether the consumption of creatine affects acute strength without the use of training, and whether there are differences in the type of consumed creatine. Two forms of creatine were used in this research: creatine monohydrate and creatine complex. The protocol of supplementation with creatine complex showed the most effective effect on the acute strength of the biceps brachii muscle, while the implementation of creatine monohydrate proved to be the most effective in acting on the quadriceps femoris muscle. The consumption of supplements in the selected amounts and time of implementation did not result in a statistically significant increase in the acute strength of the biceps brachii and quadriceps femoris muscles