Akutni utjecaj kofeina na brzinu pokreta pri izvedbi potiska s ravne klupe

master's thesis

• Title (english): Acute effects of caffeine on movement velocity in bench press exercise
• Author: David Siljan
• Mentor: Pavle Mikulić (mentor)
• Committee member: Pavle Mikulić (predsjednik povjerenstva)
• Committee member: Saša Vuk (član povjerenstva)
• Committee member: Goran Marković (član povjerenstva)
• Committee member: Daniel Bok (član povjerenstva)
• Granter: University of Zagreb; Faculty of Kinesiology; Zagreb
• Defense date and country: 2020-07-07, Croatia
• Scientific / art field, discipline and subdiscipline: SOCIAL SCIENCES; Kinesiology

Abstract

Cilj ovog randomiziranog, dvostruko slijepog, placebom kontroliranog istraživanja s ukriženim ustrojem bio je utvrditi akutni utjecaj kofeina na brzinu koncentričnog dijela pokreta pri izvedbi vježbe potisak s ravne klupe kod osoba iskusnih u treningu s otporom. Uzorak je činilo 25 ispitanika (dob (aritmetička sredina ± standardna devijacija) 23.0 ± 2.0 godine, visina 182.9 ± 7.3 cm, masa 83.2 ± 11.3 kg) koji su kroz tri dolaska u laboratorij prošli upoznavajući dolazak, te testiranje izvedbe nakon konzumacije 6 mg/kg kofeina ili 6 mg/kg placeba. Zadatak ispitanika je bio izvesti jedno ponavljanje s maksimalnom brzinom koncentričnog dijela pokreta pri 50%, 75% i 90% njihovog jednog maksimalnog ponavljanja (1RM). U uvjetu konzumacije kofeina dobivena je statistički značajna razlika u brzini pokreta u odnosu na placebo pri opterećenjima 75% 1RM (p<0,001; +6,7%) i 90% 1RM (p<0,001;
+9,1%), dok pri opterećenju od 50% 1RM (p=0,48; +1,0%) nije bilo statistički značajne razlike u izvedbi. Zaključeno je kako kofein ima ergogeni učinak na brzinu izvedbe koncentričnog dijela pokreta u izvedbi potiska s ravne klupe, a njegov učinak je naglašeniji što je vanjsko opterećenje veće, tj. što su veći zahtjevi za generiranjem mišićne sile. Temeljem rezultata istraživanja može se preporučiti konzumacija kofeina prije treninga s otporom (barem kad su vježbe za gornji dio tijela u pitanju) u svrhu akutnih poboljšanja u brzini izvedbe.

Abstract (english)

The aim of this randomized, double-blind, placebo-controlled, cross sectional study was to determine the acute effects of caffeine on the velocity of the concentric part of movement when performing bench press exercise in individuals experienced in resistance training. The sample consisted of 25 subjects (age (mean ± standard deviation) 23.0 ± 2.0 years, height 182.9 ± 7.3 cm, weight 83.2 ± 11.3 kg) who performed three visits to the laboratory. The first visit was a familiarization visit, subsequently followed by two visits in which movement velocity was assessed after consumption of 6 mg/kg of caffeine or 6 mg/kg of placebo. The task for the subjects was to perform one repetition with the maximum velocity of the concentric part of the movement at 50%, 75% and 90% of their one maximum repetition (1RM). A statistically significant difference was obtained at loads of 75% 1RM (p
<0.001; + 6.7%) and 90% 1RM (p <0.001; + 9.1%) in favor of caffeine condition compared to placebo, while at a load of 50% 1RM (p = 0.48; + 1.0%) there was no statistically significant difference in performance. It was concluded that caffeine has an ergogenic effect on the movement velocity during bench press exercise, and its effect are more pronounced at higher loads (i.e., when the requirements for generating muscle force are higher). Based on the results of the research, it may be recommended to consume caffeine before resistance training (at least when upper-body exercises are involved) for the purpose of acute performance improvements.

• Keywords: kofein; snaga; potisak s ravne klupe; trening s otporom
• Keywords (english): caffeine; power; bench press; resistance training
• Language: croatian
• URN:NBN: urn:nbn:hr:117:029281
• 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)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-12-04 11:21:36