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پژوهش در طب ورزشی و فناوری - پیاپی 10 (پاییز و زمستان 1394)

نشریه پژوهش در طب ورزشی و فناوری
پیاپی 10 (پاییز و زمستان 1394)

  • تاریخ انتشار: 1394/11/28
  • تعداد عناوین: 8
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  • Dr Heidar Sadeghi, Shiva Noori Pages 1-15
    Introduction and
    Purpose
    Due to the importance of functional balance tests assessment with emphasis on parameters influencing the balance including somatotype, this study undertaken to determine the reliability of functional balance tests (static, semi-dynamic and dynamic) in endomorphe healthy women within 24-34 years old.
    Methodology
    25 female endomorphe with the average and standard deviation age of 27.32±2.13 yrs, height of 161.13±6.37 cm and weight of 58.28±8.46 kg, participated in this study. Functional balance tests were assessed while Heath-Carter approach applied to determine the participant somatotype. All the functional balance tests are used for each individual three times within 72 hours. Data distribution normalization are evaluated by means of Kolmogorov-Smirnov test, while ICC was used for assessing the reliability at a significance level of P
    Results
    The reliability of all static, semi-dynamic and dynamic balance tests used in this study was confirmed with an endomorphe type body. Assessing static balance, the Stork and Angel tests; semi-dynamic balance, Star Excursion Balance Test test; and dynamic balance, the Timed to Get Up and Go and Tandem Walking tests got very good reliability level (ICC>0.80
    Keywords: Reliability, Balance, Somatotype
  • Aidin Zarifi, Dr Hamid Rajabi, Dr Sadegh Hasan Nia, Dr Mohamadreza Dehkhoda, Dr Babak Mirsoltani Pages 17-33
    High-intensity interval training (HIT) induces skeletal muscle metabolic and performance adaptations that resemble traditional endurance training despite a low total exercise volume. On the other hand, fatty acid oxidation is increases in skeletal muscle with endurance training. This process is regulated in several sites, including the transport of fatty acids across the plasma membrane. The transportation across this membrane is recognized to be primarily protein mediated. Therefore, the purpose of this study was to determine the effect of low-volume high intensity interval training on protein content of sarcolemmal fatty acids transporters (FAT/CD36 and FABPpm) in young men. Twenty recreationally active young men were assigned to a HIT (n=10, 19.3 yr old, 67.2 kg body wt, and 172.7 cm ht) or Control (n=10, 19.7 yr old, 65.9 kg body wt, and 174.4 cm ht) group. HIT group performed three training sessions per week over 4 weeks. Each session consisted of 8-11×60 s intervals at ∼100% of peak power output elicited during a ramp VO2peak test separated by 75 s of recovery. Skeletal muscle (vastus lateralis) biopsy samples were obtained before and after training. HIT increased (17.5%)VO2peak (p
    Keywords: Low, volume High, Intensity Interval Training, FAT, CD36, FABPpm, Fatty acid
  • Saeid Eimani Zadeh, Dr Mansoor Sahebzamani, Dr Mohammad Taghi Amiri Khorasani Pages 35-46
    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.
    Keywords: hip, knee kinematics, knee injury, functional fatigue, jumping, soccer specific- heading
  • Mahmood Khodabakhshi, Dr Ahmad Ebrahimi Atri, Dr Seyed Ali Akbar Hashemi Javaheri, Hosein Ashoori, Naser Farokh Roo, Vahi Khodabandeh Loo Pages 47-57
    One of the most important success factors in most athletic competitions, receiving aerobic power (speed, agility and jumping) high. Basketball is a great combination of short and long term activities that depend on aerobic fitness. Anaerobic fitness of many players during the match determines tactical the performance. The purpose of the present study to investigate the effects of strength exercises on anaerobic power and some the variables related Traband it. The subjects consisted of 30 basketball players Young, randomly into two equal groups of 15 subjects (experimental and control) were randomly assigned to weeks and 3 sessions the Exercises were done in a week. To analyze the data, independent samples T-test and paired sample T-test used at a significance level p ≤ 0/05. Later for six weeks of exercises, significant differences between the records obtained from the anaerobic power the variables (speed, agility, vertical jump) were observed between the two groups. The present study showed that the strength exercises with the variables Traband improve anaerobic power in young basketball players and And according to the results of seem to exercises Traband useful method for improving performance of the anaerobic the athletes.
    Keywords: strength exercises, Traband, anaerobic power, young basketball player
  • Fatemeh Malek Hoseini, Dr Mehdi Rafei Boroojeni, Dr Shahram Lenjan Nezhadian Pages 59-67
    The aim of the study was to compare the electrical activity pattern of major muscles involved in handball triple shooting in two groups of adolescents and adults. Ten adolescent elite handball players playing in national club league (16.4 ± 0.69) and 10 adult handball players (23.55± 2.69) participated in this research. They performed triple shooting æ assuming in a match situation and electrical activity of the Biceps brachii, Triceps brachii, pectorialis major muscles and three anterior, middle and posterior parts of deltoid was recorded using surface electromyography. Parameters related to the muscular activity pattern, including time, peak, action amplitude and contraction sequences were obtained. The results of t-student statistical test for two independent groups (p≤ 0.05) shown that there were no significant difference between time, peak and electrical activity amplitude variables between groups. It seems the factors such as experience in adolescent athletes, better utilization of muscle and being close to the end of puberty makes no difference between adolescents and adults.
    Keywords: Electrical Activity Pattern of Muscles, Handball Triple Shooting, Surface Electromyography
  • Mojtaba Ashrostaghi, Dr Elham Shirzad Pages 69-77
    Take-off is the critical phase of the long jump event. The aim of this study was to explore the relationships between different variables and success in take-off. 37 trials performed by 8 long jumper, participants in fourth indoor Asian senior athletics championships held in Tehran, with personal best average of 7.68±0.28 meter were recorded at 300 Hz. Five speed-related, five technical and four strength-related variables as well as an anthropometric variable were measured using motion analysis software. More gain in vertical velocity and less loss of horizontal velocity are considered as two criteria of take-off success and their relationships with other variables were determined through correlation and regression analysis. Significant level of 0.05 was set. Some variables of all four groups were significantly correlated with success criteria. These variables along with some others were entered in regression equations. The results emphasized on dominant role of the technique and approach velocity and represented the effect of anthropometric characteristics on success in takeoff. Furthermore eccentric strength of knee extensors was shown as the main strength factor in this performance.
    Keywords: Long Jump Take-off, Speed, Strength, Technique, Anthropometry
  • Dr Abbas Saremi, Dr Masood Golpayegani, Zeinab Moradi Pages 79-90
    Introdiction and Aim: Nowadays, due to the epidemic of sports supplements, the effects of these supplements on athletic performance require analysis and evaluation.The aim of the present study was to investigate the effect of arginine supplementation for one week on oxygen uptake kinetics and time to exhaustion in female taekwondo athletes.
    Method
    In this semi-experimental study with pretest – posttest design, eighty female taekwondo athletes (age: 19.88±2.33 y, height: 167.53±6.04 cm, weight: 60.98±2.4 kg) were randomly assigned to argenine supplementation (n=9) or placebo (n=9) groups. Subjects performed the incremental test (initially, the work load 50 watts and 30 watts increase in workload every minutes, as long as subjects will be able to maintain the highest pedal rate and the failure to reach). To simulate a taekwondo match day test session consisted of three maximal incremental test intervals (1 to 2 hours). The experimental group was supplemented with 6g arginine powder and placebo group received 6g microcrystalline cellulose each day for one week. Seven days after, post test accordingly pretest was used by all subjects. Pulmonary gas exchange was measured by gas analyzer to breath-by breath method. Oxygen uptake kinetics variables (oxygen deficit, time constant 1, time constant 2) were evaluated by gas analyzer with breath-by breath method. Data was analyzed using two ways ANOVA.
    Results
    The time to exhaustion was extended following consumption of arginine (p
    Conclusion
    It seems that arginine supplementation improves oxygen kinetics factors and time to exhaustion in female taekwondo athletes.
    Keywords: Arginine, Female, Oxygen uptake kinetics, Taekwondo, Time to exhaustion
  • Sahar Khademi, Dr Roohallah Ranjbar, Dr Mohsen Ghanbarzadeh Pages 91-101
    Purpose
    The purpose of this study was the effect of eight weeks of circuit training on the Irisin levels and the Insulin Resistance Index (HOMA-IR) in overweight women.
    Materials And Methods
    In this study 22 overweight women voluntarily were chosen (Age 26.04±4.43 yrs, BMI 29.35±2.53 kg/m2) and were divided to two groups of control (n=11) and experimental (n=11). In the experimental group, subjects performed circuit training for eight weeks and four times per week. Blood sample was taken before and 48 hours after the last training session. Statistical analysis at the level of PFindings: After eight weeks of training, the level of Irisin in experimental group significantly increased while the HOMA-IR had a significant reduction (p
    Conclusion
    It appears that circuit training improves body composition and metabolic disorders such as insulin resistance through Irisin induction in overweight women.
    Keywords: Obesity, Irisin, Insulin Resistance Index, circuit training