| Abstract | Cilj ovog randomiziranog, dvostruko slijepog, placebom kontroliranog istraživanja s ukriženim ustrojem bio je utvrditi akutni utjecaj kofeina iz žvakaćih guma i iz gelova na visinu vertikalnog skoka opisanog skokom s pripremom (eng. countermovement jump, CMJ) i skokom bez pripreme (eng. squat jump, SJ). Uzorak ispitanika se sastojao od 17 muškaraca (dob (aritmetička sredina ± standardna devijacija) 22,9±1,6 godina, tjelesna visina 183,3±5,0 cm, masa tijela 83,3±10,6 kg) koji su iskusni u treningu s otporom. Tijekom 6 dolazaka u laboratorij, ispitanici su se upoznali sa protokolom istraživanja i mjeren im je rezultat visine vertikalnog skoka pri uvjetima uzimanja kofeina od 300 mg i rezultat u kontrolnim uvjetima. Rezultati su pokazali da je došlo do statistički značajne razlike (p<0,001) izmeĎu rezultata pri uvjetima konzumacije kofeina i uvjetima bez konzumiranja kofeina. Primjenom kofeinskih žvakaća u izvedbi skoka s pripremom dobivena je statistički značajna razlika (p<0,001; +5,7%) u odnosu na kontrolno mjerenje. Uporabom gela s kofeinom, takoĎer, dolazi do statistički značajne razlike u odnosu na kontrolno mjerenje (p=0,01; +4,0%). MeĎutim ne postoji statistički značajna razlika u visini vertikalnog skoka s pripremom izmeĎu uvjeta uzimanja kofeinske žvakaće i kofeinskog gela (p=0,48; +1,6%). Prilikom izvedbe skoka iz čučnja, korištenjem žvakaćih guma sa kofeinom, dobivena je statistički značajna razlika (p=0,03; +3,9%) u odnosu na rezultate kontrolnog mjerenja. Konzumacija gela, takoĎer, pokazuje statistički značajnu razliku (p=0,01; +4,9%) u izvedbi skoka iz čučnja u usporedbi sa kontrolnim mjerenjem. No, ni ovdje ne postoji statistički značajna razlika (p=1,00; -0,9%) rezultata visine skoka iz čučnja izmeĎu dva kofeinska izvora. Zaključeno je kako je svejedno iz kojeg izvora se konzumira kofein jer će u oba slučaja doći do poboljšanja rezultata visine vertikalnog skoka. Muškarcima koji su iskusni u treningu s otporom, može se preporučiti konzumacija ili kofeinskih žvakaća ili gelova, 10 minuta prije treninga radi akutnog poboljšanja rezultata vertikalnog skoka. |
| Abstract (english) | The aim of this randomized, double-blind, placebo-controlled cross-sectional study was to determine the acute effect of caffeine from chewing gums and gels on the height of the vertical jump described by the countermovement jump (CMJ) and the squat jump (SJ). The sample consisted of 17 men (age (arithmetic mean ± standard deviation) 22.9 ± 1.6 years, body height 183.3 ± 5.0 cm, body weight 83.3 ± 10.6 kg) who were experienced in resistance training. During 6 visits to the laboratory, the subjects were introduced to the research protocol and their vertical jump height was measured under caffeine intake conditions of 300 mg and the result under control conditions. The results showed that there was a statistically significant difference (p<0.001) between the results under caffeine consumption conditions and caffeine-free conditions. The use of caffeinated chewing gum in the performance of the jump with preparation resulted in a statistically significant difference (p<0.001; +5.7%) in relation to the control measurement. The use of caffeine gel also resulted in a statistically significant difference compared to the control measurement (p=0.01; +4.0%). However, there is no statistically significant difference in the height of the vertical jump with preparation between the conditions of taking caffeine chewing gum and caffeine gel (p=0.48; +1.6%). When performing a squat jump, using caffeinated chewing gum, a statistically significant difference (p=0.03; +3,9%) was obtained in relation to the results of the control measurement. Gel consumption also showed a statistically significant difference (p=0.01; +4.9%) in the performance of the squat jump compared to the control measurement. However, there is no statistically significant difference (p=1.00; -0.9%) in the squat jump height between the two caffeine sources. It was concluded that it does not matter from which source caffeine is consumed because in both cases there will be an improvement in the results of the vertical jump height. Men who are experienced in resistance training may be advised to consume either caffeine chewing gum or gels, 10 minutes before training to acutely improve the results of the vertical jump. |
| Study programme | Title: Kinesiology; specializations in: Kinesiology in Education and Track-and-Field, Kinesiology in Education and Fitness, Kinesiology in Education and Wrestling, Kinesiology in Education and Sailing, Kinesiology in Education and Windsurfing, Kinesiology in Education and Judo, Kinesiology in Education and Kayaking, Kinesiology in Education and Kinesiological Recreation, Kinesiology in Education and Kinesitherapy, Kinesiology in Education and Physical Conditioning of Athletes, Kinesiology in Education and Basketball, Kinesiology in Education and Football, Kinesiology in Education and Volleyball, Kinesiology in Education and Basic Kinesiological Transformations, Kinesiology in Education and Dancing, Kinesiology in Education and Swimming, Kinesiology in Education and Rhythmic Gymnastics, Kinesiology in Education and Handball, Kinesiology in Education and Skiing, Kinesiology in Education and Artistic Gymnastics, Kinesiology in Education and Management of Sport, Kinesiology in Education and Tennis, Kinesiology in Education and Rowing
Course: Kinesiology in Education and Kinesitherapy
Study programme type: university
Study level: integrated undergraduate and graduate
Academic / professional title: magistar / magistra kineziologije (magistar / magistra kineziologije) |
