Showing 15 results for Soccer
, , ,
Volume 0, Issue 0 (11-2019)
Abstract
Introduction and Objective: One of the strategies that athletes can use to temporarily increase strength and muscle power is post-activation potentiation (PAP) during warm-up. However, the effect of this phenomenon on kinematics of special movement has not been determined. Therefore, the aim of this study is to investigate the acute effect of PAP during warm-up on lower extremity kinematic characteristics during heading in soccer players.
Methodology: The study sample consisted of 24 semi-professional youth soccer players with an average age of 18.67±1.11 years, height 182.32±7.12 cm, mass 74.17±7.46 kg. who performed four different warm-up methods, including PAP-take-off, PAP-landing, combined-PAP, and general warm-up, derived from the stages of soccer heading. Knee and hip angular velocities during the take-off phase, maximum knee flexion angle, and duration of knee joint pause during the landing phase were recorded using a three-dimensional motion analysis device (vicon peak ltd, oxford, vicon UK) with four T20 cameras with a frequency of 1000 Hz. Finally, analysis of variance with repeated measurements and post hoc Bonferroni test were used at a significance level of P<0.05.
Results: There was a significant increase in knee and hip angular velocities following combined-PAP and then PAP-take-off compared to other warm-up programs. Moreover, there was a significant increase in knee flexion angle after PAP-landing compared to other warm-up programs. Additionally, there was a significant increase in the duration of knee joint pause after general warm-up compared to other warm-up programs.
Discussion and Conclusion: PAP-take-off improves jumping performance, while PAP-landing improves landing performance. The combination of these two methods, i.e., combined-PAP, will yield better results overall.
Dr Sajad Karami, Dr Hamid Rajabi, Dr Majid Kashef, Dr Mohammad Ali Gharaat,
Volume 0, Issue 0 (11-2019)
Abstract
Introduction and purpose: The present study was conducted with the aim of investigating the effect of acute glutamine supplementation along with intermittent exercise on Hsp70 and blood lactate response of club football players. Methodology: 32 players of the Tehran Railway team were selected and randomly divided into four groups: control, supplement, supplement-sports activity, and sports-activity. Subjects participated in daily exercises before conducting the study, and only two complementary groups - sports activity and sports activity - performed the periodic protocol. Blood samples were taken at baseline, pre-test, post-test and 90 minutes after the test. The supplement and placebo were consumed in an amount of 0.5 g/kgBW and a volume of 5 ml/kgBW one hour before the periodic protocol. The interval protocol included 3 stages of 20-minute running with an intensity of 80% of the maximum heart rate and a 5-minute rest of walking between the stages. HSP72 and blood lactate levels were measured using ELISA and enzymatic methods, respectively. The data were analyzed using the analysis of variance test with repeated measures and the between-group factor at the P≤0.05 level. Findings: Glutamine supplement alone and together with exercise stimulate the response of HSP72 and the combination of supplement and exercise leads to a greater response of HSP72 and lactate changes did not play a role in this response. Discussion and conclusion: It seem that taking glutamine supplements in the long term creates more adaptations, which of course should be studied.
Masomeh Taghikhani, , ,
Volume 11, Issue 6 (10-2013)
Abstract
The purpose of this study was to compare of hip abductor and external rotator
muscles strength between male soccer players with ACl rupture and healthy
male soccer players. 30 male participants (15 soccer players with ACL rupture
as sample group and 15 healthy soccer players as control group) participated in
this study. Hip abductor and external rotator muscles strength tests including
normalized isometric strength of hip abductor and hip external rotator muscles
were evaluated by dynamometer in both groups. Independent t-test was used to
compare datas between two groups.The results showed significant differences
in normalized isometric strength of hip abductor muscles (P=0.003) and hip
external rotator muscles (P=0.127). Regarding the findings of this study, there is
significant difference of hip muscles strength between male soccer players with
ACL rupture and healthy male soccer players .
, , ,
Volume 11, Issue 6 (10-2013)
Abstract
The purpose of this study was to examine the difference between two types of
the soccer instep kick in temporal sequence of motion and muscle
electromyography, during forward swing phase of the kick. Ten elite soccer
players, volunteered as subjects in the study. To culculate the kinematics data,
we used DLT method with two video camera that filmed five markers fixed on
anatomical points of lower body, at 240 fpm. Moreover the electromyography of
rectus femoris, vastus medialis and tibialis anterior were estimated. Kinematic
data from ten players was extracted using image processing toolbox of
MATLAB software. Using these results, we compared sequences of joint motion
and progression of activation muscle in low drive and high drive kick. The
results indicate that there was a difference in ranks of muscle activation
between two kick, but there were no difference in muscles activation time and
sequence of joint motion between low drive and high drive kick. Furthermore
both kicks have a similar proximal-distal pattern and interaction in muscles
contraction and joints motion
Mr Saeid Eimani Zadeh, Dr Mansoor Sahebzamani, Dr Mohamad Taghi Amiri Khorasani,
Volume 13, Issue 10 (10-2015)
Abstract
The purpose of this study was to investigate the effect of soccer specific functional fatigue on hip and knee
joints angles during landing in professional players.15 soccer players with at least 2 years experience in
Kerman soccer clubs were selected randomly. To evaluate the lower extremity kinematics following
jumping and soccer specific- heading, three cameras (with50Hz) were used. To cause fatigue in subjects,
specific functional protocol similar to specific bangsbo soccer was used and Quantic sport v21 soft ware
was administrated for kinematic analysis of the recorded films. To statistical analyzing of data, descriptive
statistical methods, and paired-t test were administrated at α=0.05.Finding revealed that hip and knee
angles in sagittal and frontal plane in landing is influenced by functional fatigue. This results has been
reducing knee and hip flexion angles and increased varus in knee joint. Results demonstrated a more
erect landing posture due to a decrease in hip and knee flexion angles in the post fatigue condition.
However, functional fatigue significantly decrease lower extremity control ability in male soccer player
during landing.
Mrs Mostafa Zarei,
Volume 14, Issue 11 (4-2016)
Abstract
The incidence of lower extremity injuries in young soccer players is high, but the risk factors for injuries are unknown. Thus, the aim of this study was to investigate relationship between static lower extremity alignment and injuries in adolescent soccer players. Four teams (78 players) playing at Tehran Asia vision adolescence primer league (14-16 years old) participated in this study. Before entering the season Navicular drop, quadriceps angle, knee hyperextension, genu varum and body mass index was measured. Players were monitored for musculoskeletal injuries through a season (7-month period). overall injury rate was 8.7 injuries/1000 player-hours (95% CI=7.01-10.10). Logistic regression modeling indicated that Navicular drop in preferred foot (OR=4.5; p=0.001), Q angel in preferred leg (OR=2.77; p=0.048), and genu varum (OR=4.06; p=0.021) were all associated with injuries but no association was found in other parameters. Players had an approximately 4.5 times greater chance of suffering a lower extremity injury if they have Navicular drop greater than 1.5 centimeter and approximately 2.77 times greater chance of suffering injury if they have Q angel greater than 15.5 degrees. These findings show that multiple anatomic measures such as Navicular drop, genu varum and Q angle can predict soccer players’ injuries. Results of this study are valuable for coaches and players for injury prevention.
Dr Mostafa Zarei,
Volume 14, Issue 12 (10-2016)
Abstract
The incidence of lower extremity injuries in young soccer players is high, but the risk factors for injuries are unknown. Thus, the aim of this study was to investigate relationship between static lower extremity alignment and injuries in adolescent soccer players. Four teams (78 players) playing at Tehran Asia vision adolescence primer league (14-16 years old) participated in this study. Before entering the season Navicular drop, quadriceps angle, knee hyperextension, genu varum and body mass index was measured. Players were monitored for musculoskeletal injuries through a season (7-month period). overall injury rate was 8.7 injuries/1000 player-hours (95% CI=7.01-10.10). Logistic regression modeling indicated that Navicular drop in preferred foot (OR=4.5; p=0.001), Q angel in preferred leg (OR=2.77; p=0.048), and genu varum (OR=4.06; p=0.021) were all associated with injuries but no association was found in other parameters. Players had an approximately 3.47 times greater chance of suffering a lower extremity injury if they have Navicular drop greater than 1.5 centimeter and approximately 2.77 times greater chance of suffering injury if they have Q angel greater than 15.5 degrees. These findings show that multiple anatomic measures such as Navicular drop, genu varum and Q angle can predict soccer players’ injuries. Results of this study are valuable for coaches and players for injury prevention.
Mohamad Hadi Ghasemi, Mohamad Fashi,
Volume 16, Issue 15 (9-2018)
Abstract
The aim of present study was comparison of advanced physical fitness profile between Olympic soccer team members of Iran according to playing position. 29 Invited soccer players to the 17th national Olympic soccer team of Iran dispatched to 17th Asian Olympics Games, Incheon 2014 )mean age of 20.39± 2.01 yrs(, divided into five group of goalkeepers, defenders, midfield players, wingers and attackers according to playing position participated in the study. Body composition parameters (including body mass index, body fat percentage), isokinetic force (peak torque, agonist/antagonist ratio, work fatigue, total work of extension and flexion), aerobic power by analysis of respiratory gases and anaerobic power and fatigue index by Wingate test were packaged for data collection. Descriptive statistics (i.e., mean ± standard deviation) and inferential statistics (i.e., one way ANOVA with Hopkins post hoc after subtracting data of pre- post) used for analysis data. While it was unbelievable the findings did not show any significant difference between five groups of present study. It seems that Olympic soccer team players of Iran has not prepared in a conditioning principle and based on playing position for participate in 17th Asian games. Moreover it supposed that national players spent most of the preparation periods & specific based conditioning workouts on their clubs, hence due to the short time of conditioning in the national camps trainings, players have not dispatched to the games with favorable preparation.
Sh Lenjannejadian, J Reisi,
Volume 17, Issue 17 (4-2019)
Abstract
Balance is a complex concept, especially when one wants to do complex motor skills. Therefore, the balance during activity is more important than the static and dynamic balance that is performed without the skill. The aim of this study was to introduce a new activity-based balance index of elite soccer players. 27 young soccer players (12-14 years) whom participated in Iranian premier league were selected. To assess their balance, activity and skill, four functional tests consisting one leg stance, dynamic Y balance, running and dribbling tests were administered. During these tests, besides their relative scores, the acceleration of body center was also recorded using an accelerometer and a new activity-based balance index (ABI) were calculated from these available data. The Results showed a significant positive correlation between ABI and both static and dynamic balance scores(r=0.6, p=0.002). Also, a significant negative correlation was found between ABI and dribbling scores(r=-0.45, p=0.026), which could be interpreted as the necessity of agility of the players. It could be concluded that this new activity-based balance index was found to be successful for evaluating both the balance and the skill level of soccer players.
Mr Hamid Mahmodi, Dr Hamid Rajabi, Mr Mohsen Bapiran, Dr Pezhman Motamedi,
Volume 19, Issue 21 (9-2021)
Abstract
The purpose of this study was to compare the effect of plyometric training pre and post maturation period with soccer training on electromyographical index and soccer players performance. 30 students of soccer player's pre maturation period (weight 32.38±6.59 kg, age 10.35±0.59 years, and height 141±0.06cm) and post maturation period (weight 43.79±10.96 kg, age 15.43±0.72 years, and height 156.84±0.09 cm) were selected. Subjects in the experimental group were 15 students before and after maturity period. To evaluate the age of the indices such as height, age, dental and bone age (radiographic method) was used. Then, for homogeneous groups of index of biological age radiography was used by radiologists. Before and after 4 weeks of training,, functional tests of two 20 meter speed, agility, vertical jump and also Amplitude for vastus lateralis muscle Were taken. The result by using Paired t-test showed that in pre maturation group in the vertical jump, agility and 20 meters there was a significant difference (P=0.002,P=0.006,P=0.001) and the other variables there was no significant difference. In variations between the groups, independent t-test showed that only significant differences was found in the test 20 meter speed (P = 0.007) and in the other variables not significantly different. The results showed that plyometric training in the Pre maturation group compared to post maturation group were more effect and these results can help in the design training for premature age groups
Mr Iman Rouzbeh, Dr Amirhossein Barati, Dr Hooman Minoonejad,
Volume 19, Issue 21 (9-2021)
Abstract
As Squat is a popular exercise for support of lower extremity muscles in order to injury prevention this study has been hold to comprise the electromyography of vastus medialis and vastus lateralis muscles in three Squat techniques of man soccer players. 15 soccer players, aged 18-25 years old, who had regular exercise more than two years did open, closed and lung Squats exercise while electromyography of vastus medialis and vastus lateralis muscles were recorded. Data analyzed by using dependent and independent T test and repeated measure ANOVA. There was not significant difference of vastus medialis and vastus lateralis muscles’ electromyography during getting up, going down phases and also for different squat techniques. The vastus lateralis muscle show more activity in all conditions. Though, it is recommended that vastus medialis has bold role for controlling of squat exercise, reduction of Q angle and participants’ knee varus in this study can be the reason of antithesis.
Mohammad Alimoradi, Mansur Sahebazamini, Roya Bigtashkhani,
Volume 19, Issue 22 (12-2021)
Abstract
Background and Objective: The movement patterns play a key role in the incidence of non-contact ACL injuries. This study attempts to investigate the effect of the +11 program on the jump-landing pattern in female amateur soccer players. Methods: 30 female amateur soccer players were randomly divided into experimental and control groups (15 people in each group). The experimental group performed the +11 program 3 times per week for 16 weeks whereas the control group maintained their regular warm-up method during the study. The jump-landing pattern of the players was investigated by a Special football jump-landing task using the landing error scoring system. Results: The results of the study showed that the 16 weeks of implementation of the +11 program significantly improved the jump-landing error scores of the players in the experimental group. Also, comparison of the results between experimental and control groups showed that there is a significant difference between the two groups. Conclusion: It can be concluded that the +11 program could improve the jump-landing pattern of the female soccer players in pre_ participation evaluation (PPE). Therefore, trainers are advised to use this program as an alternative to regular warm-ups in order to prevent injury.
Dr Rasul Eslami, Navab Abnama,
Volume 20, Issue 24 (3-2023)
Abstract
The aim of the present study was to investigate The effect of HMB-FA supplementation on the muscle damage markers after soccer matches. 24 male soccer players (age: 23±3 years, BMI: 22.8±2 kg/m2) were voluntarily selected as the statistical sample of this study and were divided into two Suppplement and Placebo groups (n=12). In this study, subjects participated in a weekly soccer microcycle with two matches. Subjects in the supplement-training group consumed three grams of HMB-FA daily during a weekly soccer cycle. Blood samples were taken in seven times (before supplementation, before the first match, immediately after the first match, 24 hours after the first match, before the second match, immediately after the second match, 24 hours after the second match). Plasma concentrations of creatine kinase (CK) and lactate dehydrogenase (LDH) were measured by ELISA kits. Data analysis was performed using Friedman, Wilcoxon, Kruskal-Wallis and U Mann-Whitney tests with a significance level of p ≥ 0.05. After supplementation, a significant decrease in plasma levels of lactate dehydrogenase (before and after the first match) and creatine kinase (in the times immediately after the first match and before the second match) was observed (for all, p <0.05). Intaking HMB-FA supplement reduced the markers of muscle damage, which is essential for recovery from injuries caused by training and competition during a two race cycle. In addition, inaking HMB-FA supplement may have other effects, including reducing neuromuscular fatigue, reducing the inflammatory response, and rapid skeletal muscle regeneration, which requires further study.
Ghazal Mohammad Gholipour Aghdam, Dr Mohammad Hossein Alizadeh, Dr Hooman Minoonejad, Dr Elham Shirzad,
Volume 20, Issue 24 (3-2023)
Abstract
Neurocognitive motor tasks have been shown to have an effective relationship with athletic performance and musculoskeletal injuries. Cognitive changes following anterior cruciate ligament reconstruction surgery may lead to adverse knee biomechanical changes and an increased risk of secondary injury. This study aimed to compare the kinetics of athletes with a history of ACL reconstruction and those without injuries. A total of 30 professional male soccer players, comprising 15 anterior cruciate ligament reconstruction athletes who had returned to the performance and 15 healthy athletes, participated in this study. The subjects performed at least 5 drop landings with cognitive intervention to decide the landing point on the force plate. The maximum ground reaction force, time to stability and center of pressure with length of path index were calculated at the moment of landing. The Mann-Whitney U test was used to compare the variables. The results indicated a significant difference in four variables: the maximum mean vertical ground reaction force in all landings (p = 0.04), the maximum mean vertical ground reaction force in the best landings (p = 0.01), the maximum average vertical ground reaction force in all landings (p = 0.01), and the maximum mean mediolateral ground reaction force in the best landings (p = 0.03). However, no statistical significance was observed in the variable of maximum time to stability in all landing classes (p > 0.05).The study findings suggest that impaired decision-making with cognitive interference during the flight phase may increase the risk of re-injury in individuals with anterior cruciate ligament reconstruction.
Masoud Barzegar, Malihe Hadadnezhad, Sadredin Shojaedin, Amir Letafatkar, Rose Fouladi,
Volume 21, Issue 26 (12-2023)
Abstract
The aim of this research was effect of eight weeks of neuromuscular training (NMT) with and without cognitive-dual tasks (DTs) on proprioception and balance of athletes with ACL deficiency (ACL-D). 39 soccer players with ACL-D were selected purposefully and randomly divided into three groups of 13 (control group, neuromuscular training group and neuromuscular training with dual tasks group). Two training groups performed the exercises for eight weeks and three sessions per week. cognitive-motor dual tasks were performed in one of the groups along with neuromuscular exercises in the form of counting down numbers, memorizing numbers, calculating unexpected equations, specialized football skill movements. The results of the current study indicated that there was no significant difference in knee joint proprioception in the open and closed kinetic chain after applying the intervention between the three groups, but there was a significant difference in lower extremity performance of the athletes based on the Y balance test in the anterior and posterior-lateral direction between the three groups (p<0.05). It seems that providing neuromuscular exercises along with cognitive-dual tasks can probably be considered as a useful approach to improve lower extremity performance based on the Y balance test in athletes with anterior cruciate ligament deficiency.
