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Effect of caffeine on maximal strength of the complex exercises
Šťastný, Daniel ; Třebický, Vít (advisor) ; Petr, Miroslav (referee)
Title: Effect of caffeine on maximal strength of the complex exercises Objectives: The main aim of this theses is to investigate caffeine's effect on the maximum strength of the deadlift exercise. The sub-objectives of the thesis are to test whether the magnitude of the effect of caffeine differs between the upper half of the body compared to the lower half, and also whether caffeine has an effect on the production of maximal strength after insufficient rest. Methods: The randomized double-blind study consisted of 1 baseline and 2 experimental sessions . At the start of the experimental sessions, participants were given either caffeine (3 mg/kg) or placebo 60 min before testing. In a randomized order, maximal isometric strength with sufficient rest between reps was measured for the deadlift (IMT) and benchpress (IBP) exercises. Subsequently, maximal isometric strength was measured for the isometric mid-thigh (IMTP) exercise after insufficient rest. A total of 36 healthy resistance-trained men habituated to caffeine consumption participated in this study Results: RM ANOVA showed that caffeine increased performance at IMT, compared to placebo (d = 0.229 [0.61, 0.397]), but not compared to baseline. For the IBP exercise, caffeine has no effect compared to placebo, but baseline session was...
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Upper limb and trunk strength asymmetry and relationships in young elite soccer players
Haisová, Linda ; Hank, Mikuláš (advisor) ; Kunzmann, Egon (referee)
This diploma thesis aimed to evaluate the level of upper limb strength asymmetry between the dominant and non-dominant side and trunk rotation strength in young soccer players, then to compare this relationship with respect to strength performance. The research population consisted of 18 young players in the U16 age group who play soccer at an elite level. Players participated in isometric upper extremity and trunk strength testing. Data collection of isometric upper limb grip strength (Handgrip) parameters was performed using a digital handheld dynamometer (Takei, A5401, Japan). A Humac Norm Cybex isokinetic dynamometer (CSMi, Humac Norm, USA) in isometric mode was used to test trunk strength in rotation. The results of the trunk rotation force values in favor of the dominant side averaged 19.83 ± 3.47 kg. For the non-dominant side, players achieved average results of 19.17 ± 3.33 kg. The T-test results showed that the dominant side of the body achieved significantly higher results in absolute trunk rotation strength with a value of p = 0.035, also in relative strength with a value of p = 0.032. In the Handgrip, the average result value on the dominant side was found to be 41.76 ± 8.63 kg. The non-dominant side achieved a mean grip strength value of 39.68 ± 5.79 kg. The results of the T-test...
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Bilateral asymmetry of lower limb strength abilities in young snowboardcross athletes
Bohůnková, Marie ; Hank, Mikuláš (advisor) ; Gnad, Tomáš (referee)
The aim of this diploma thesis was to find out the relationships between the performance of strength skills of the dominant and non-dominant lower limbs with respect to the preferred side of riding in snowboarders of different sexes at the racing level. Elite and sub-elite level snowboarders aged 19.16 ± 4.63 years (11 females and 9 males) participated in testing the isokinetic force in the knee joint and the isometric force in the hip joint. Data collection of isokinetic parameters of flexion strength and extension in the knee joint was performed on a Cybex Humac Norm isokinetic dynamometer (Cybex NORM®, Humac, CA, USA). Collection of isometric parameters of abduction force and adduction in the hip joint was performed by the ForceFrame systémem system (Vald Performance, Australia). The position on the snowboard affected the bilateral asymmetry of force in favor (p <0.05) of the dominant limb (front on the snowboard) in some parameters. The magnitude of the isokinetic force between the dominant and non-dominant limbs differed significantly (p <0.05) at extension in the male group, but not in the female group. Significance difference (p <0.05) was found for flexion only for male group. The dominant lower limb achieved a significantly higher (p <0.05) value of the isometric force of abduction in the...
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Unilateral functional asymmetry of forearm muscles in sport climbers
Palacký, Vít ; Baláš, Jiří (advisor) ; Hráský, Pavel (referee)
Title: Unilateral functional asymmetry of forearm muscles in sport climbers Objectives: The aim of the study is to evaluate the impact of experienced strain injury of forearm muscles on maximal isometric strength ratios between the flexors and extensors of the fingers in sport climbers. Methods: People were in two groups, twelve people in each of them. In the first group were the climbers after the strain injuries of forearm muscles (earlier than in last 3 months). In the second group were the climbers without these injuries. The dynamometer MIE Medical in Laboratory of sport motoric FTVS UK was used for the method. The maximal value of isometric strength of flexors and extensors of the fingers was measured. For the analysis of the results was used the unpaired t-test for unequal sample sizes with equal variances. Results: The climbers with experienced forearm muscle injury had statistically not significant higher maximal isometric strength ratios between flexors and extensors of the fingers. Higher values of maximal isometric strength of finger flexor muscles were measured in climbers with injuries in anamnesis and the lower values of maximal isometric strength of finger extensor muscles. These two differences were not statistically significant too. Keywords: muscle asymmetry - isometric strength...
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