Hemn Mohammadi - Profile on Academia.edu (original) (raw)

Papers by Hemn Mohammadi

Background and Aims The most serious and severe injuries among female volleyball players is the k... more Background and Aims The most serious and severe injuries among female volleyball players is the knee injury, especially the anterior cruciate ligament (ACL) tear. Its key risk factors are dynamic knee valgus (DKV) and abnormal alignment during jump landing. One of the successful protocols regarding the prevention of knee injuries in female volleyball players is professional sportsmetrics volleyball training. In the present study, the effect of this protocol on DKV correction and landing error scoring system (LESS) was investigated. Methods The current research is quasi-experimental with a pre-test-post-test design. The statistical sample included 30 female volleyball players (Mean±SD age: 20.83±2.22 years, Mean±SD height: 168.16±6.47 cm, Mean±SD weight: 59.13±7.4 kg, Mean±SD body mass index (BMI): 20.83±1.52 kg/ m 2 , and Mean±SD sports experience: 5.46±1.8 years) who were randomly divided into the training (15 people) and control (15 people) groups. Double leg squat and LESS tests were used to evaluate DKV and landing error. The exercise group participated in the present protocol for 6 weeks, three sessions per week. Each session was approximately 90 minutes, including warm-up exercises, sportsmetrics volleyball training, and cool-down. The analyses of covariance were used to evaluate the data at a significant level of P=0.05. Results The results of covariance analysis showed that performing these exercises significantly reduced (P=0.01) DKV (from 23.13 to 7.86) and landing error (from 17.46 to 7.6). In other words, the training group experienced a 66% decrease in DKV and a 56% decrease in landing error after performing six weeks of sportsmetrics volleyball training. Conclusion Sportsmetrics volleyball training has successfully improved performance and prevented ACL injury in female volleyball players. According to the present study results, performing these exercises leads to correct DKV and improves lower extremity alignment and landing technique. Therefore, performing sportsmetrics volleyball training is strongly recommended for female volleyball players with DKV.

DOAJ (DOAJ: Directory of Open Access Journals), Oct 1, 2019

Identifying lower extremity defects during high impact activity, such as landing, especially in y... more Identifying lower extremity defects during high impact activity, such as landing, especially in young athletes who play team sports, could help to prevent non-contact lower extremity injuries. The Tuck Jump Assessment (TJA) is a screening instrument designed to recognize neuromuscular deficits related to Anterior Cruciate Ligament (ACL) injury. The current study investigated the prevalence rate of neuromuscular deficits during tuck jump in female and male physical education and sports sciences collegiate students. Methods: The study subjects included all undergraduate students of physical education and sports science at the University of Kurdistan in 2018-2019 academic year (male/female =55-77, Mean±SD age: 21.3±1.7 y, weight: 63.4±12.3 kg, height: 169.4±9.5 cm, body mass index: 21.97±2.94 kg/ m2, and sports experience: 4.95±3.38 y). All study subjects conducted the TJA, which consisted of continuous maximal height tuck jumps for 10 seconds. Tuck jump performance was recorded by two cameras in sagittal and frontal planes and was evaluated using the Kinovea software. The performance was scored across 10 criteria using the modified scale (0-2). Results: One-Way Analysis of Variance (ANOVA) results revealed a significant difference between the tuck jump scores in male and female athletes (P<0.01). The difference between male and female athletes was not significant in neuromuscular fatigue and quadriceps dominance; in both groups, the prevalence of these defects was <15%. However, there was a significant difference between the ligament dominance, trunk dominance, and leg dominance of male and female athletes (P<0.01). The prevalence of leg dominance in males (65.5%: 49.1% grade 1, 16.4% grade 2) was higher than that of the females (45.5%: 40.30% grade 1, 5.2% grade 2). But the prevalence of ligament dominance in females (81.8%: 51.9% grade 1, 29.9% grade 2) was higher than that of the males (40%: 34.5% grade 1, 5.5% grade 2). Besides, the prevalence of trunk dominance in females (72.7%: 57.1% grade 1, 15.6% grade 2) was higher than that of the males (26.3%: 25.5% grade 1, 1.8% grade 2). Conclusion: The mean score of incidence of the ligament dominance, trunk dominance, and leg dominance was ˃50% in the study subjects. Thus, it is recommended that preventive exercise programs emphasize on the correction of these defects. The correction of leg dominance deficiency is a priority among males; however, the correction of ligament dominance and trunk dominance is the priority among females.

The Emmidiate Effect of Different Types of Common Ankle Orthosis on Balance Indexes: A Study on Volleyball Players with Unstable Ankle Grade I and II

Investigate the effect of different types of ankle braces on postural control indexes: A Study on athletes with unstable ankle degree I and II

Journal of Research in Rehabilitation Sciences, Oct 7, 2013

چکیده مقدمه: هدف از این تحقیق بررسی اثر سه نوع بریس) نئوپرینی ،ایرکست و بنددار) بر روی شاخص‌های ک... more چکیده مقدمه: هدف از این تحقیق بررسی اثر سه نوع بریس) نئوپرینی ،ایرکست و بنددار) بر روی شاخص‌های کنترل قامت در والیبالیست‌های دارای مچ پای ناپایدار درجه یک و دو می‌باشد. مواد و روش‌ها: آزمودنی‌های این تحقیق 15 والیبالیست در دامنه سنی 18 تا 25 سال باحداقل 3 سال سابقۀ بازی و دارای مچ پای ناپایدار درجه 1 و2 بودند. در طول مراحل تحقیق چهار بار(بدون بریس، بریس نئوپرینی، بریس بنددار، و بریس ایرکست) آزمون کنترل قامت توسط دستگاه تعادلی بایودکس (تست کنترل قامت ورزشکاران بر روی یک پا در سطح دشواری12) صورت گرفت. داده‌های تحقیق با استفاده از روش آماری آنالیز اندازه‌های مکرر یکطرفه تجزیه و تحلیل شد و سطح معنی داری 95/0 با آلفای کوچکتر یا مساوی 05/0استفاده گردید. يافته‌ها: نتایج نشان داد که میزان شاخص کلی ثبات هنگام بکارگیری هر سه نوع بریس در مقایسه با شرایط عدم استفاده از بریس کاهش معنی‌داری دارد، یا به عبارتی هر سه نوع بریس باعث بهبود کنترل قامت می‌شوند. هنگام مقایسه سه نوع بریس، بریس نئوپرینی بهتر از دو نوع بریس دیگر عمل کرد. ولی در مقایسۀ دو نوع بریس بنددار و ایرکست اختلاف معنی‌داری بین این دو مشاهده نشد. به عبارتی در بهبود کنترل قامت، بریس نئوپرینی بهتر از بریس ینددار و ایرکست عمل می‌کند. اگرچه بریس بنددار تا حدودی بهتر از ایرکست عمل می‌کند، اما این دو نوع بریس در بهبود کنترل قامت اختلاف معنیدار با همدیگر ندارند. نتيجه‌گيری: با استفاده از یافته‌های موجود میتوان از بریس به عنوان روشی مناسب جهت بهبود کنترل قامت در افراد دارای مچ پای ناپایدار و جهت پیشگیری از آسیب‌های لیگامانی استفاده کرد و برای افراد دارای ناپایداری درجه یک و دو استفاده از بریس نئوپرینی می‌تواند نتایج بهتری نسبت به استفاده از دو نوع بریس دیگر داشته باشد. کلیدواژه‌ها: مچ پای ناپایدار، بریس مچ پا، شاخص‌های کنترل قامت

Physical treatments, Jul 1, 2022

Dynamic knee valgus and poor technique during landing are not only key risk factors for lower ext... more Dynamic knee valgus and poor technique during landing are not only key risk factors for lower extremity injuries especially knee injury, but also can reduce the performance of athletes in the field. Sportsmetrics soccer training is one of the successful knee injury prevention and enhancement performance protocols for female soccer players. Because the effect of sportsmetrics soccer training has not been investigated on the performance and knee valgus during landing in female soccer players, we aimed to investigate this subject. Methods: The current field-trial study was conducted on 24 female soccer players with dynamic knee valgus that were randomly divided into two groups: the training group (TG) and the control group (CG). The assessment tests were the agility t-test, 40-yard test, vertical jump test, double leg squat test, and valgus landing error scoring system test (LESS). The TG group participated in sportsmetrics soccer training regularly for 6 weeks, three 90-min sessions a week. Analysis of covariance was used to analyze the obtained data (P<0.05). Results: Six weeks of sportsmetrics soccer training in the TG group not only reduced dynamic knee valgus during landing (51% reduction, F=171.8, P=0.01) but also improved performance factors significantly: agility (0.50 s reduction, F=23.29, P=0.01), power (2.50 cm increase, F=13.20, P=0.01) and speed (0.30 s reduction, F=23.66, P=0.01). Conclusion: Sportsmetrics soccer training is strongly suggested for soccer players exposed to knee injuries due to dynamic knee valgus during landing.

DOAJ (DOAJ: Directory of Open Access Journals), Mar 1, 2018

The purpose of this study was to investigate the effect of dynamic knee valgus during overhead sq... more The purpose of this study was to investigate the effect of dynamic knee valgus during overhead squat, on hip and ankle joints muscle strength and range of motion in basketball players. Methods: In this study, 35 healthy basketball players (with the mean age of 20.98± 1.99, height 183.27 ± 6.64 cm and mass 75.31 ± 9.24 kg), in the control group (n = 18) and dynamic knee valgus group (n = 17) with no lower-extremity injury during the past volunteed to take part in the study. The peak force and the passive range of motion were measured rspecively by a hand-held dynamometer and a goniometer. The Independent samples T-test at the significance level of 0.05 was used to determine the difference of strength and range of motion in the control and dynamic knee valgus groups. Results: BCompared with the control group, the dynamic knee valgus group showed to have a greater strength of the hip external rotation and extension (respectively P=0.000, P=0.004), smaller Plantarflextion strength (P=0.001), smaller dorsiflexion range of motion with knee bent (P=0.021), and greater external rotation of the hip (P=0.002). Conclusion: The results showed that the dynamic knee valgus group exhibited tight and weak ankle musculature, and as appeared, training interventions focused on improving strength and range of motion of the ankle can improve lower extremity kinematics during overhead squat and can modify the dynamic knee valgus.

DOAJ (DOAJ: Directory of Open Access Journals), Sep 1, 2018

High load and intensity exercises often begin in the early teenage years and therefore the risk o... more High load and intensity exercises often begin in the early teenage years and therefore the risk of musculoskeletal and overuse injuries sush as spine injuries among young athletes increases in most sports fields, especially in young athletes at overhead and throwing sports. The purpose of this study was to review the kinesiopathology of thoracolumbar spine injuries in throwing and overhead young athletes. Methods: Articles on the topic in the past two decades were searched in sush databasesas in PubMed Medline and Science Direct and articles with keywords like "Pitchers Spine", "Throwers Spine", "Pitchers Injuries", and "Overhead Throwers Injuries". Finally 24 papers were selected from among 134 papers. Results: Most of elbow and shoulder overuse injuries in throwing occur at preparation phase and deceleration phase. Muscle injuries in throwing and overhead young athletes, often include core muscle strain which includes internal and external oblique, transverse abdominal and in relatively high rates rectus abdominis and the core muscle strain rein jury. The damage to the posterior elements of the spine occur due to the rotation, hyperextension, and flexion during repetitive activities such as swing the bat and hitting. The incidence of scoliosis in throwing and overhead young athletes with asymmetric load distribution on the trunk and shoulders is very common. The discs of these athletes are prone to injury due to axial loading, hyperextension/ flexion and rotation during the preparation exercises and also due to biomechanics of throwing, swing and services. Conclusion: Throwing skills can affect the entire kinetic chain. Force production in each segment of the body increases the load on the adjacent segments and ultimately injuries occurred in the weaker segments and joints of the body. Accordingly, it is recommended in assessing thoracolumbar injuries and development treatment plans for throwing and overhead athletes, dynamic stability of pelvis, lower back and core be evaluated. Following thoracolumbar spine injuries, the athletes should be allowed to return to play after achieving the free pain range of motion, and stability of lumbopelvic-hip complex, and progress in the rehabilitation plane to special sport exercise phase.

اثر دو نوع بریس بر روی کنترلقامت پویا در شرایط اعمال خستگی عملکردی : مطالعه والیبالستهای دارای مچ پای ناپایدار

فیزیک درمانی- نشریه تخصصی فیزیوتراپی, Jan 15, 2015

Core strength, dynamic balance and performance enhancement in female athletes with ligament dominance in response to sports-specific SportsMetrics neuromuscular training programs

Sport Sciences for Health

Scientific journal of Kurdistan University of Medical Sciences, 2015

CYP1A2 Genotype Polymorphism Influences the Effect of Caffeine on Anaerobic Performance in Trained Males

International Journal of Sport Nutrition and Exercise Metabolism, 2021

The purpose was to investigate the effects of CYP1A2 −163C > A polymorphism on the effects of ... more The purpose was to investigate the effects of CYP1A2 −163C > A polymorphism on the effects of acute caffeine (CAF) supplementation on anaerobic power in trained males. Sixteen trained males (age: 21.6 ± 7.1 years; height: 179.7 ± 5.6 cm; body mass: 72.15 ± 6.8 kg) participated in a randomized, double-blind, placebo (PLA) controlled crossover design. Participants supplemented with CAF (6 mg/kg of body mass) and an isovolumetric PLA (maltodextrin) in random order and separated by 7 days, before an all-out 30-s anaerobic cycling test to determine peak, average, and minimum power output, and fatigue index. Genomic deoxyribonucleic acid was extracted to identify each participants CYP1A2 genotype. Six participants expressed AA homozygote and 10 expressed C alleles. There was a treatment by genotype interaction for peak power output (p = .041, η2 = .265, observed power = 0.552) with only those expressing AA genotype showing improvement following CAF supplementation compared with PLA (CA...

The Effect of Sportsmetrics for Soccer on Performance and Knee Valgus during Landing in Female Players

Physical Treatments - Specific Physical Therapy Journal

Introduction: Dynamic knee valgus and poor technique during landing are not only key risk factors... more Introduction: Dynamic knee valgus and poor technique during landing are not only key risk factors for lower extremity injuries especially knee injury, it also can reduce performance. Sportsmetrics soccer training is one of the successful knee injury prevention and enhancement performance protocols in female soccer players. But, the effect of Sportsmetrics soccer training has not been investigated on performance and knee valgus during landing in female soccer players. This study was done with purpose of investigating this subject. Methods: Present field-trial study consists of 24 female soccer players with dynamic knee valgus that randomly divided into two groups, training group (TG) and control group (CG). The assessment tests contain: T agility test, 40-yard test, vertical jump test, double leg squat test and valgus during landing error scoring system test. The TG participated in Sportsmetrics soccer training regularly for six weeks and three sessions a week about 90 minutes. ANCOV...

A slow march through the desert

2016 Fourth Place

بررسی اثر انواع بریس بر روی شاخص‌های کنترل قامت در ورزشکاران دارای مچ پای ناپایدار درجه یک و دو

مجله پژوهش در علوم توانبخشی, 2013

Physical Treatments: Specific Physical Therapy Journal, 2018

Purpose: A theory states that strong core stability allows athletes to fully transfer forces from... more Purpose: A theory states that strong core stability allows athletes to fully transfer forces from the upper extremities to lower extremities, and finally to the ground. On the contrary, weak core stability causes alterations in transferring forces, reduces sport performance, and increases risk for injury, especially in the lower extremities. Therefore, the current study investigated the relationship between core endurance and performance in professional female badminton athletes. Methods: To examine the aforementioned relationship, badminton athletes invited to the 2017 Youth National Team camp (n=16, Mean±SD age=14.9±1.2 y, height=163.0±4.5 cm, weight=57.8±4.3 kg) completed core endurance and performance tests. Badminton athletes performed 5 performance tests (Y balance, vertical jump, 20 m sprint, 4×9 agility, and single-leg triple crossover hop tests), and 4 core endurance tests (trunk flexor, trunk extensor, and bilateral side bridge tests). Results: Data analysis indicated significant correlations between core endurance and balance (r=0.52, P=0.04), as well as between core endurance and triple crossover hop test (r=0.63, P=0.01); however, relations between core endurance and other performance tests (vertical jump, 20 m sprint, agility) were not statistically significant. Conclusion: Considering the significant correlations between core endurance and balance and triple crossover hop test, it is suggested that personal trainers, coaches, and badminton athletes use the core stability exercises to improve balance and single-leg cutting maneuver. As a result, the chance of non-contact lower extremity injuries caused by the loss of balance or those occurring during cutting movement will be reduced.

Physical Treatments: Specific Physical Therapy Journal

Purpose: Compared with other sports, soccer is an activity with a relatively high incidence of in... more Purpose: Compared with other sports, soccer is an activity with a relatively high incidence of injury. To decrease the number of injuries, prevent early retirement, and provide a healthy and safe environment for players, preventive programs are highly recommended. This study aimed to investigate the effect of Sportsmetrics Soccer Training (SMST) on Landing Error Scoring Systems (LESS) and dynamic balance in soccer players. Methods: This study was a randomized controlled trial with pretest-posttest design and training (TG) and control (CG) groups. The statistical population comprised young soccer players over 18 years old recruited from Zulfaqarnasab Soccer Academy in Sanandaj City, Iran. The study participants were 29 soccer players with three years of experience in soccer clubs. The subjects were randomly assigned into TG (n=14, mean±SD age=18.40±0.5 years, mean±SD height=180.40±6.86 cm, mean±SD weight=70.47±9.62 kg) and CG (n=15, mean±SD age=18.64±0.08 years, mean±SD height=179.57...

Biyumikānīk-i varzishī, 2018

Objective: The purpose of this study was investigate the effect of dynamic knee valgus during ove... more Objective: The purpose of this study was investigate the effect of dynamic knee valgus during overhead squat, on hip and ankle joints muscle strength and range of motion in basketball players. Methods: In this study 35 healthy basketball players (with the mean age 20.98± 1.99, height 183.27 ± 6.64 cm and mass 75.31 ± 9.24 kg), in the control group (n = 18) and dynamic knee valgus group (n = 17) with no lower-extremity injury during the last year were the volunteers. The peak force and the passive range of motion were measured rspecively by a hand-held dynamometer and a goniometer. The Independent T-test at the significance level of 0.05 was used to determine the difference of strength and range of motion in the control and dynamic knee valgus groups. Results: Compared by the control group, the dynamic knee valgus group showed to have a greater strength of the hip external rotation and extension (respectively P=0.000, P=0.004), smaller Plantarflextion strength (P=0.001), smaller dors...

The Effect of Dynamic Knee Valgus during Overhead Squat on Distal and Proximal Knee Joints Muscle Strength and Range of Motion in Basketball Players