فهرست مطالب

پژوهش در طب ورزشی و فناوری - پیاپی 9 (بهار و تابستان 1394)

نشریه پژوهش در طب ورزشی و فناوری
پیاپی 9 (بهار و تابستان 1394)

  • تاریخ انتشار: 1394/06/19
  • تعداد عناوین: 7
|
|
  • Moammadir., Sadeghih.*, Barati, A.H Pages 13-22
    Introduction and
    Purpose
    The swimming start is very important for achieving better results in competitions. The Purpose of this study was to compare the effects of two plyometric training techniques both in aquatic and on land in two start techniques (grab and track) of butterfly swimming in Elite male adolescent Swimmers.
    Methodology
    20 elite male swimmers divided into two groups of plyometric exercises in water and land-based. Swimming performance variables including; anaerobic power of hands and legs, 25 meter swimming record, The time of contact of head with water and the time of keeping movement in water, Flying distance from the starting point to the end point of contact with water and the distance of continuing movement after entering the water using both start techniques, the number of movements of hands and legs in 13 meters butterfly swimming without start and glide. Data analysis was performed with MANOVA test.
    Results
    Significant difference was seen in the mean time of contact of head with water in both start techniques (grab and track) of Butterfly swimming; in addition, there is significant difference in mean number of hand movement and leg movement in butterfly swimming and the number of hand and leg movement in full 13 meter butterfly swimming after polymeric exercise in two groups.
    Discussion and
    Conclusion
    According to the findings of this study, using plyometric training program led to an increase and improvement in the measured parameters, and use these exercises to improve start swimming recommended.
    Keywords: Aquatic Plyometric, Land Plyometric, Start Butterfly Swimming
  • Mirkarimpour, S.H.*, Fallahmohammadim., Alizadeh, M.H Pages 24-36
    One of the factors affecting jump-landing patterns is fatigue. Fatigue is an inevitable component of physical activity, hence the aim of the present study was to investigate the effect of functional fatigue on landing mechanics through Landing Error Scoring System (LESS).Fourteen male college students with a mean age of 22±2 years, weight of 68.3±7.2 kg and height of 174±4 were randomly divided into two groups: experimental and control. Effect of independent variable, fatigue, due to activities resembling athletic training or competition (6- stations functional fatigue protocol) on dependent variable, landing mechanics, through pre test-post test was investigated. The independent t-tests and non-parametric U-Mann Whitney test was used for statistical analysis of data (P
    Keywords: Functional fatigue, Landing mechanics, LESS
  • Shirzade., Ravasi, A.A., Ashrostaghi, M.* Pages 37-46
    Stiffness is an index for determination of elastic properties of body and its optimum range is different in various motion patterns. The Spring-mass model is used for calculating stiffness. In this method, the whole leg is modeled with a linear simple spring. The aim of this study is determination of lower body stiffness and evaluation of its correlation with agility, as dominant motion pattern in racket sports. 12 national-level male racket-players (age: 25±4 years & weight: 80±7 kg) participated voluntarily in this study. Leg and vertical stiffness were measured during running on treadmill and hopping test. Pearson’s correlation coefficients were used to examine the relationships between stiffness and agility test records. Statistical significance was set at P
    Keywords: Elastic Properties of Body, Stiffness, Agility, Spring, Mass Model
  • Keihaniyana.*, Ebrahim, K.H., Rajabih., Marandi, S.M Pages 47-62
    The aim of this study was to Compare the effect of resistance training with active and passive rest on aerobicand anaerobic fitness in soccer players. For this purpose 16 players of Foolad Mobarakeh Sepahan club,accidentally were divided into rest and active group (Height 177.78±6.68 cm, Weight 64.88±7.97 kg, age 18.22±0.83 years ,and percent fat 20.47±1.8) and rest passive group(Height 178.57±6.99 cm, Weight 64± 6.6kg, age 18±0.81 years ,and percent fat 20.05±1.7). The tests were performed in this order: maximal oxygen consumption, maximal strength, Tmax, muscular endurance, Hoff and RAST test in the pre and post test. The exercises were done for 8 weeks and twice week with 10 exercises of 30 to 50 percent of maximal strengthwith this difference that the active rest group performed 3 sets of 20 repetitions exercise in 30 seconds that rest interval between 30 seconds was completed with 2 sets of 10 repetitions exercise in 30 second. The passive group performed 4 sets of 20 repetitions exercise in 30 seconds that rest interval between 30 seconds wascompleted with 3 sets passive rest. After determining the normality by Kolmogorov Smirnov test and homogenous variance test, independent and dependent t-tests with a significant level of α ≥ 0.05 were used. The results indicate that after the training period, a significant difference was found in all variables except fatigue index in active rest group. But in passive rest group there were a significant difference in variables AT, vVo2max, Tmax, performance of Hoff test, bench press muscular endurance and leg press strength from pre test to post test. The results between groups indicated that there was a significant difference between two groups in Vo2max, Tmax, AT, vVo2max, leg press muscular endurance, and mean power in benefits of active rest group. Finally, the results showed that the resistance training with active rest causes improvements in aerobic and anaerobic fitness of soccer players in comparison to resistance training with passive.
    Keywords: Interval Resistance Training, Active, Passive Rest, Tmax, vVo2max, Vo max, Peak Power, Hoff Test, Muscular Strength
  • Naderis., Mohammadipourf.*, Amirseyfaddini, M.R Pages 63-73
    The purpose of current study was to investigate the spatio-temporal gait parameters and knee varus angle during walking at different speeds in young with knee varus. 18 subjects with varus deformity classified at grade 3 of bowleg and 17 healthy subjects, volunteered to participate in this study. The following variables include stance, swing, double support and cycle time, cadence, stride length, angle of varus at the heel contact, midstance and toe off when walking on the treadmill at speeds of 80, 100 and 120 percent of preferred walking speed, were measured from using the three-dimensional motion analysis system with six optoelectronic cameras. The results of between-group tests showed that spatio temporal gait parameters in the varus group is similar to the normal group. Also varus angular variables in varus group, was indicate higher values in comparison to the healthy group, but there were no significant differences. The results of inter-group tests also showed the knee varus angle generally increases with increasing speed, that none of the differences were not significant. According to the results, the increase in walking speed will caused to increase knee varus angle. Therefore, walking with speed less than the normal walking speed, probably is a suitable solution to reduce the loads exerted on the knee joint and prevention of premature osteoarthritis in young with knee varus.
    Keywords: Gait, Kinematics, Walking Speed, Knee Varus
  • Abdim., Esmaeilih., Nazemf., Anbarian, M.* Pages 75-86
    The aim of this study was to compare the effects of two pedaling methods on lower limb muscles fatigue index and muscular activity in road cyclists. For this purpose eight road cyclists participated in two separately session in laboratory. They were pedaling with pushing technique in first session and circling (pullingpushing) technique in the other session. Surface electromyography activity of the Rectus Femoris, Vastus Medialis, Vastus Lateralis, Biceps Femoris, Semitendinosous, Gastrocnemius Medialis, Gastrocnemius Lateralis and Tibialis Anterior muscles of the subjects were recorded. Each session was performed according to predetermined protocol until exhaustion. There was a significant difference between pushing and rest phases during two pedaling techniques with higher muscle activity in pushing technique. Subjects during circling technique exhausted later. According to the results of this study, the circling technique caused lower muscle activity consequently, increases gross efficiency. It is recommended that road cyclists utilize the circling technique.
    Keywords: Cycling, Pedaling Technique, Electromyography, Fatigue
  • Yarahmadia., Samavati Sharif, M.A.*, Eghbali Khosro, Sh, Hesari, P Pages 87-94
    Introduction and aim: The aim of present study was to assess the effect of six weeks Badminton training on changes of stress and cortisol levels in non-athletic female students.
    Materials And Methods
    In this study estimated stress of 120 non-athlete students by stress questionnaire (HAD scale). Were measured Among subjects who had suffered highest stress, 30 subjects with a mean age of 86/2 ± 22 years, height 56/5 ± 163 cm and weight 95/4 ± 57 kg were selected. Cortisol were measured by the bloodletting. The subjects were divided into two experimental and control groups as homogeneous. But the control group did not perform any activity. After training protocol variables were measured again in the same conditions. To estimate the effect of independent variables on the dependent variable of the t-test and the independent ttest to compare groups with a significance level (p
    Results
    The results of this study showed that doing a six-week badminton practice reduces cortisol levels (p =0.005), and decreasing stress (p =0.03) in the experimental group.
    Conclusion
    There was significant change in levels of cortisol and stress in experimental group.
    Keywords: Cortisol, Badminton Training, Stress