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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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Strength asymmetries in female soccer players depending on the player's post.
Lisoň, Maroš ; Ižovská, Jana (advisor) ; Šťastný, Petr (referee)
Title: Strength asymmetries of female soccer players according to playing position Objectives: The aim of this diploma thesis was to characterize the unilateral and bilateral asymmetries of knee flexors and extensors in elite football players based on player positions and to define the characteristic isokinetic strength profile for each playing positions. Methods: The research group consisted of 66 female football players who play in the highest czech league. The players completed laboratory testing under the supervision of qualified experts, which took place according to the standard conditions described in the methodological part of this study. In the case of players, we examined the strength asymmetries in the flexors and extensors of the knee and compared them between the 4 basic positions in football. Results: After summing the data from all angular velocities (60ř.s-1 , 180ř.s-1 , 300ř.s-1 ) we found that 33% of our attackers had quadriceps asymmetries above 10%, which was the most of all posts. This is followed by goalkeepers with 28% and midfielders with 25%. The lowest percentage of quadriceps asymmetries was recorded in defenders 22%. Even in the case of hamstrings, we recorded the most asymmetries (> 10%) in attackers, up to 46%. For midfielders and defenders, it was the same result for...
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The effect of alcohol drinking on the isokinetic knee strength
Vopat, Jan ; Strejcová, Barbora (advisor) ; Dvořák, Martin (referee)
Title: The effect of alcohol drinking on the isokinetic knee strength Objectives: The objective of this thesis is to assess the effect of alcohol on isokinetic knee strength during extension and flexion. Methods: Fifteen volunteers participated in this study. Their age was 23,9 ± 1,9 years, height 179,5 ± 7,2cm and weight 78,5 ± 7,95kg. They were all students from sports faculty. One group of volunteers was given alcohol with juice (0,8g of alcohol to 1kg of fat-free mass), the second group drank only juice. We used the switch design study. We measured isokinetic knee strenght on dynamometer Cybex Humac Norm (Cybex NORM ®, Humac, CA, USA) in three types of angular velocity (6Oř/s, 180ř/s, 240ř/s). The parametrs were peak torque, muscular work, average muscular power and time to peak. Results: We registered statistically significant increase of peak torque, muscular work and average muscular powers when measuring flexion in all the three angular velocities (60ř/s, 180ř/s, 240ř/s). We did not register statistically or effect size significant diference readings of time needed for maximal peak torque when measuring flexion and extension. The only exception was angular speed 240ř/s where we registered a factually significant change in time needed for extensors to reach the maximal peak torque....
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The effect of active recovery and hydroterapy on the subsequent short-term and medium-term muscular performance
Strejcová, Barbora ; Süss, Vladimír (advisor) ; Pavlů, Dagmar (referee) ; Pyšný, Ladislav (referee)
Title: The effect of active recovery and hydroterapy on the subsequent short-term and medium-term muscular performance Objective: The aim of the study was to compare the effect of two recoveries (ice pack, passive recovery) on the subsequent short-term and three recoveries (active recovery, cold water immersion, passive recovery) on the medium-term knee strength in the extension and flexion. Methods: Fourteen athletes in an average age of 26,6±4,4 years performed, in a random cross-over design, 2 sessions with 5 repeated short-term isokinetic tests and 3 sessions with 3 repeated medium-term isokinetic tests. The effect of ice packs and passive rest and the effect of active recovery, passive rest and cold water immersion were assessed by the 5x2 (time x recovery) and 3x3 (time x recovery) repeated-measure ANOVA, respectively. Results: The ice packs did not have any effect on peak torque, total work and average power during short-term performances. The average heart rate was significantly lower during measurements with the ice packs than during the passive recovery (125±15 vs. 135±20 tepů. min-1 ). We stated significantly lower changes in knee extension for the peak torque after the active recovery (↑ 0,9 N.m) than after the cold water immersion (↓ 14,6 N.m) or the passive recovery (↓ 13,9 N.m). The...
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Strength asymmetries in female soccer players depending on the player's post.
Lisoň, Maroš ; Ižovská, Jana (advisor) ; Šťastný, Petr (referee)
Title: Strength asymmetries of female soccer players according to playing position Objectives: The aim of this diploma thesis was to characterize the unilateral and bilateral asymmetries of knee flexors and extensors in elite football players based on player positions and to define the characteristic isokinetic strength profile for each playing positions. Methods: The research group consisted of 66 female football players who play in the highest czech league. The players completed laboratory testing under the supervision of qualified experts, which took place according to the standard conditions described in the methodological part of this study. In the case of players, we examined the strength asymmetries in the flexors and extensors of the knee and compared them between the 4 basic positions in football. Results: After summing the data from all angular velocities (60ř.s-1 , 180ř.s-1 , 300ř.s-1 ) we found that 33% of our attackers had quadriceps asymmetries above 10%, which was the most of all posts. This is followed by goalkeepers with 28% and midfielders with 25%. The lowest percentage of quadriceps asymmetries was recorded in defenders 22%. Even in the case of hamstrings, we recorded the most asymmetries (> 10%) in attackers, up to 46%. For midfielders and defenders, it was the same result for...
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The influence of isokinetic force on CODS performance of football players
Žáček, Adam ; Hojka, Vladimír (advisor) ; Červinka, Pavel (referee)
Title: The influence of level of isokinetic force on CODS performance of football players. Objectives: The main goal is comparison of influence between isokinetic power of lower limbs and performance in CODS tests. Method: Measured group consisted of players between 15-19 years old from teams Motorlet Praha and Bohemians Praha. Players of one age category passed the tests batery in one day, that consist of agility (Arrowhead L and R, Illinois, K-test, Hexagon test, 505 L and R), Cybex was used to find informations about isokinetic force. Results: The biggest correlation between isokinetic (IK) force and performance in CODS tests was measured between IK tests and CODS test Illinois -0,443. Other tests had from very weak to average correlation. The worst correlation was found between IK tests and Hexagon test - 0,007, which showed insignificant correlation between these tests. Concentric muscle contraction achieved higher correlation than eccentric muscle contraction and with changing degree speed was correlation in concentric muscle contraction lower, while eccentric muscle contraction correlation was slightly higher in faster degree speed. Keywords: Isokinetic force, agility, CODS, football, training
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The influence of isokinetic force on CODS performance of football players
Žáček, Adam ; Hojka, Vladimír (advisor) ; Červinka, Pavel (referee)
Title: The influence of level of isokinetic force on CODS performance of football players. Objectives: The main goal is comparison of influence between isokinetic power of lower limbs and performance in CODS tests. Method: Measured group consisted of players between 15-19 years old from teams Motorlet Praha and Bohemians Praha. Players of one age category passed the tests batery in one day, that consist of agility (Arrowhead L and R, Illinois, K-test, Hexagon test, 505 L and R), Cybex was used to find informations about isokinetic force. Results: The biggest correlation between isokinetic (IK) force and performance in CODS tests was measured between IK tests and CODS test Illinois -0,443. Other tests had from very weak to average correlation. The worst correlation was found between IK tests and Hexagon test - 0,007, which showed insignificant correlation between these tests. Concentric muscle contraction achieved higher correlation than eccentric muscle contraction and with changing degree speed was correlation in concentric muscle contraction lower, while eccentric muscle contraction correlation was slightly higher in faster degree speed. Keywords: Isokinetic force, agility, CODS, football, training
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The influence of isokinetic force on CODS performance of football players
Žáček, Adam ; Hojka, Vladimír (advisor) ; Červinka, Pavel (referee)
Title: The influence of level of isokinetic force on CODS performance of football players. Objectives: The main goal is comparison of influence between isokinetic power of lower limbs and performance in CODS tests. Method: Measured group consisted of players between 15 - 19 years old from teams Motorlet Praha and Bohemians Praha. Measurement took 3 months. Players of one age category passed the tests batery in one day, that consist of agility (Arrowhead L and R, Illinois, K-test, Hexagon test, 505 L and R), Cybex was used to find informations about isokinetic force. Results: The biggest correlation was between isokinetic (IK) force and performance in CODS tests was measured between IK tests and CODS test Illinois -0,443. Other tests had from very weak to average correlation. The worst correlation was found between IK tests and Hexagon test -0,007, which showed insignificant correlation between these tests. Concentric muscle contraction achieved higher correlation than eccentric muscle contraction and with changinging degree speed was correlation in concentric muscle contraction lower, while eccentric muscle contraction correlation was slightly higher in faster degree speed. Keywords: Isokinetic force, agility, CODS, football, training
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The effect of alcohol drinking on the isokinetic knee strength
Vopat, Jan ; Strejcová, Barbora (advisor) ; Dvořák, Martin (referee)
Title: The effect of alcohol drinking on the isokinetic knee strength Objectives: The objective of this thesis is to assess the effect of alcohol on isokinetic knee strength during extension and flexion. Methods: Fifteen volunteers participated in this study. Their age was 23,9 ± 1,9 years, height 179,5 ± 7,2cm and weight 78,5 ± 7,95kg. They were all students from sports faculty. One group of volunteers was given alcohol with juice (0,8g of alcohol to 1kg of fat-free mass), the second group drank only juice. We used the switch design study. We measured isokinetic knee strenght on dynamometer Cybex Humac Norm (Cybex NORM ®, Humac, CA, USA) in three types of angular velocity (6Oř/s, 180ř/s, 240ř/s). The parametrs were peak torque, muscular work, average muscular power and time to peak. Results: We registered statistically significant increase of peak torque, muscular work and average muscular powers when measuring flexion in all the three angular velocities (60ř/s, 180ř/s, 240ř/s). We did not register statistically or effect size significant diference readings of time needed for maximal peak torque when measuring flexion and extension. The only exception was angular speed 240ř/s where we registered a factually significant change in time needed for extensors to reach the maximal peak torque....
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The assessment of selected strength and stability parameters of ankle plantar and dorsal flexion in slackliners.
Šimková, Lenka ; Baláš, Jiří (advisor) ; Malý, Tomáš (referee)
Title: The assesment of selected strength and stability parameters of an ankle plantar and dorsal flexion in slackliners. Objectives: To assess the relation between level of stability the dorsiflexion and the plantar flexion strength in slackliners. Methods: The research sample was composed of two groups - slackliners (9 person) and balanced control group (9 person) selected from physically active population. Probands were tested on the Flamingo test on the pressure plate, the test of the dorsiflexion and plantar flexion strenght on an isokinetic dynamometer. Slackliners underwent extra range of motions elements on the slackline. The level of stability was assessed by using the centre of pressure and the physical design of individual elements on the slackline. Power was assessed by using the peak torque at 30 ř and 120 ř. Results: Slackliners achieve bigger relative strength in the plantar angular velocity of rotation of 30 ř in both limbs than the control group (left: 1.51 ± 0.31 vs. 1.20 ± 0.30 Nm.kg-1 , p <0.05 , η2 = 0.21, right: 1.55 ± 0.34 vs. 1.21 ± 0.34 Nm.kg-1 , p <0.05, η2 = 0.22). The results of other parameters (postural stability, isokinetic power at the ankle angular velocity of 120 ř.s-1 and the time course of force) between the two groups did not differ significantly. Conclusion:...
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