Kinematic Parameters of Take-Off Phase in Volleyball Back Row Spike
Reza
Naderpour
MSc in Sport Biomechanics, University of Isfahan
author
Shahram
Lenjannejadian
Assistant Professor, Department of Sport Injuries, University of Isfahan
author
Ahmadreza
Movahedi
Professor, Department of Motor Behavior, University of Isfahan
author
text
article
2016
per
The purpose of this study was to compare and to determine the relationship between biomechanical parameters of take off in successful and unsuccessful volleyball back row spikes. Seventy three correct back row spikes performed by seven elite young volleyball players were investigated in this research. Two dimensional video recordings were done during all performances and the desired kinematic parameters were computed. The results demonstrate significant differences in skill score, horizontal velocity of ball, and angle of take off between successfull and unsuccessfull performances while, differences between support time, resultant velocity at take off and height of jump were not significant between successfull and unsuccessfull spikes. The correlation anlysis also show a relationship between heigth of jump and both velocity and angle of take off. Therefore, it is suggested that the ratio of the horizontal and vertical take-off speeds to be considered for successful back row spikes.
Studies in Sport Medicine
Sport Sciences Research Institute
2322-1658
8
v.
19
no.
2016
17
30
https://smj.ssrc.ac.ir/article_859_dff169fbc95918d82d59fc62fd00845e.pdf
dx.doi.org/10.22089/smj.2016.859
A Comparison Between Test and Repair Some Performance Indicators in Athletes with a History of Anterior Cruciate Ligament of the Knee
Mohammad Hosein
Nasermelli
Ph.D. Student, University of Tehran International campus kish-Island
author
Mohammad Hosein
Alizadeh
Associate Professor of Sport Medicine, University of Tehran
author
Hasan
Daneshmandi
Professor of Sport Injury & Corrective Exercise, University of Guilan
author
Amir Hosein
Barati
Associate Professor of Sport Injury, Shahid Beheshti University
author
text
article
2016
per
Athletes return to sport requires a complete assessment of performance. The aim of this study was to investigate the relationship between test (four hop tests, single leg vertical jump and T test) and performance indicators in athletes with a history of knee anterior cruciate ligament repair to return to the sport. Subjects 40 football players with an average age of 28.4, height 175.2 and the weight of 75.4 were last at of reconstruction surgery. Six criteria for the functional test of strength, range of motion and knee proprioception and indicators to evaluate the sensitivity of each test method was evaluated by Pearson correlation coefficient. Assessing between test and indicator showing significant correlation between the tests and there are no performance indicators in the samples. In return to sport phase, functional tests and indexes, range of motion and proprioception, Each individual must be considered in evaluating the athletes return to sport.
Studies in Sport Medicine
Sport Sciences Research Institute
2322-1658
8
v.
19
no.
2016
31
42
https://smj.ssrc.ac.ir/article_878_b15f7b28bd13392384bf754f155ea4f5.pdf
dx.doi.org/10.22089/smj.2016.878
The Effect of Eight Weeks Endurance Training on the Femur and Tibia Bones in Male Wistar Rats: Biomechanical and Geometrical Parameters
Zohre
Borhani kakhki
PhD Student of Sports Biomechanics, Kharazmi University, Tehran (Faculty of Sistan and Baluchestan University
author
Heydar Sadeghi
Sadeghi
Professor of Faculty of Physical Education and Sport Science, Kharazmi University
author
Giti
Torkaman
Professor of Faculty of Medicine, Tarbiat Modarres University
author
Abbas Ali
Gaeini
Professor of the Faculty of Physical Education and Sport Science, Tehran University
author
Naghmeh
Gheidi
PhD in Sport Biomechanics, Faculty of Physical Education and Sport Science, Islamic Azad University, Saveh
author
text
article
2016
per
Regular physical activity as a non-pharmacological intervention to increase bone strength, bone density and fracture prevention is recommended. The aim of this study was to evaluate the effect of eight weeks’ endurance training on biomechanical and geometrically parameters of the femur and tibia bones in male Wistar rats. 16 rats with an age range of 50 to 60 days and an average weight of 160 ± 10 gr, were randomly divided into two groups: eight weeks of endurance training (running five days a week, according to the training protocol) and control group (no activity). After the end of the training, the rats were sacrificed, the right femur and tibia bones were harvested, then By mechanical three-point bending test, the biomechanical parameters (stiffness, maximum mechanical strength and maximum energy to the point of maximum strength) and by digital caliper, geometric parameters (length and width) were measured. One way-ANOVA was used to compare biomechanical and geometrical parameters between groups. The results demonstrated a significant increase in biomechanical parameters (stiffness, maximum mechanical strength and maximum energy to the point of maximum strength) and geometrical parameters (length and width) of the femur and tibia (except length) bones after eight weeks’ endurance training. Eight weeks’ endurance training (used in this study) improved the biomechanical and geometrical parameters of the femur and tibia bones.
Studies in Sport Medicine
Sport Sciences Research Institute
2322-1658
8
v.
19
no.
2016
43
62
https://smj.ssrc.ac.ir/article_858_40e3999f4f6663926c6405830926296b.pdf
dx.doi.org/10.22089/smj.2016.858
Does Resistance Training Have Effect on Balance and Flexibility of Patients with Prostate Cancer؟
Nader
Rahnama
Professor at University of Isfahan
author
Effat
Bambaeichi
Associate Professor at University of Isfahan
author
Hamidreza
Sadeghipoor
Persian Gulf University of Bushehr
author
text
article
2016
per
Prostate cancer is one of the most common cancers in men which does negative effects on musculoskeletal system. The purpose of this study was to investigate the effect of resistance training on balance and flexibility of patients with prostate cancer. Twenty-two men with non-metastatic prostate cancer from Isfahan voluntarily participated in this study. Patients were randomly assigned into an intervention group and control groups. Patients in experimental group participated in a resistance exercise program for 10 weeks but control group followed their normal treatment program. Before and after this period static balance (open and close eyes) and flexibility of all patients were evaluated. Results were analyzed using independent and dependent t-test. A significant improvement (P< 0.05) in balance in dominant leg (opened and closed eyes) was observed in experimental group and also in non-dominant leg only with closed eyes, but no change in control group. Flexibility improved significantly (P< 0.05) in experimental group but not in control group. It can be concluded that resistance training does positive effects on balance and flexibility in patients with prostate cancer, so it can be recommended as a modality for these patients.
Studies in Sport Medicine
Sport Sciences Research Institute
2322-1658
8
v.
19
no.
2016
63
76
https://smj.ssrc.ac.ir/article_865_0982204decae0ae61ec13c771d4d040a.pdf
dx.doi.org/10.22089/smj.2016.865
Comparison of High-Risk Movement Patterns of ACL Injury in Male and Female Adolescent Soccer Players During Cutting Maneuver
Mohammadreza
Seyedi
Ph.D. Student of Sports Medicine, University of Tehran
author
Reza
Rajabi
Professor of Health and Sports Medicine, University of Tehran
author
Elham
Shirzad
Assistant Professor of Health and Sports Medicine, University of Tehran
author
Mostafa
Zareei
Assistant Professor of Sport physiology, Shahid Beheshti University
author
text
article
2016
per
The aim of this study was to compare high-risk movement patterns of ACL injury in male and female adolescent soccer players during cutting maneuver. A number of adolescents Premier League soccer athletes, including 20 girls and 20 boys participated in the study. Cutting maneuvers on dominant foot were recorded by motion analysis system using six Vicon high-speed cameras, with a frequency of 240 Hz. Movements were analyzed by Nexus software and joint angles were collected. SPSS and independent T-Test were used to compare between groups. The results indicated that high-risk movement patterns of ACL injury during cutting maneuver on the dominant leg occurs more in girls than boys, therefore application of sport injury prevention measures to correct movement patterns of female athletes are more necessary.
Studies in Sport Medicine
Sport Sciences Research Institute
2322-1658
8
v.
19
no.
2016
77
94
https://smj.ssrc.ac.ir/article_894_635cab651110ea7a9a1d757c515a1fd0.pdf
dx.doi.org/10.22089/smj.2016.894
The Effect of Ten-Week Combined Training in Stable and Unstable Surfaces on Muscle Strength and Functional Capacity in Patients with Multiple Sclerosis
Pegah
Rahmani
PhD Student of Sport Injury & Corrective Exercise in University of Isfahan
author
Fariba
Mohammadi
Assistant Professor of Sport Injury & Corrective Exercise at Sports Sciences Research Institute
author
Hamed
Abbasi
Assistant Professor of Sport Injury & Corrective Exercise at Sports Sciences Research Institute
author
text
article
2016
per
The aim of the present study was to investigate the effect of ten-week combined training in stable and unstable surfaces on muscle strength and functional capacity in patients with multiple sclerosis. 30 patients were divided into two exercise groups and a control group. The results showed that there were significant improvements for all outcome measures in both exercise groups. Exercise group in unstable surface showed significantly larger improvement in muscle strength and 5-time sit-to-stand test and Stair- climbing test than exercise group in stable surface and control group. According to research findings, exercise in stable and unstable surfaces resulted in considerable improvements in isometric muscle strength and functional capacity in patients with multiple sclerosis.
Studies in Sport Medicine
Sport Sciences Research Institute
2322-1658
8
v.
19
no.
2016
95
116
https://smj.ssrc.ac.ir/article_883_51b76c7bef4edd8b2fb39994f98a4e59.pdf
dx.doi.org/10.22089/smj.2016.883