Mehdi Khaleghi

• PhD
• Kharazmi University

Background Gait alterations associated with postural deviations are a significant factor contributing to functional limitations in older adults. Among these, sway-back posture has been linked to chronic low back pain (CLBP), defined as pain persisting for more than three months. This study aimed to analyze ground reaction forces (GRFs), loading and...

Background: Numerous studies have examined the risk of non-contact anterior cruciate ligament (ACL) injuries during fast sports activities involving cutting maneuvers. However, these studies often focus on isolated measurements. A critical factor influencing this risk is the anticipation of the cutting movement. Objective: This study aimed to compa...

Introduction People with multiple sclerosis (PwMS) experience cognitive and motor impairments, including cognitive training and exercise training. This study compares dual task and combined exercise training in water and on land. Water-based training may enhance cognitive and motor function more effectively than land-based training, presenting a pr...

Background and aims: Adductor Related Groin Pain (AGP) is a common condition among athletes that affects their muscle strength and isokinetic profile. However, the effects of different types of muscle contractions in AGP conditions have not been investigated; Therefore, this study aimed to evaluate which muscle contraction characteristic is most im...

Background and Aims Pyramid and reverse pyramid loading patterns are used to increase the training load in resistance training. Although physiological studies have attempted to compare the two patterns, the difference between the two loading patterns on the biomechanics of the spine and pelvis has not been determined. This study aimed to investigat...

Background and Aims People with postural malalignment such as tibiofemoral varus (TFRV) may experience movement patterns dysfunction during functional activities that are related to non-contact lower extremity injuries. Training protocols should be designed for these people to control and improve their functional dysfunctions. The present study aim...

چکیده: مقدمه: درد مزمن کشاله یکی از رایج‌ترین آسیب‌های اندام تحتانی در ورزش فوتبال می‌باشد. هدف از این پژوهش مقایسه پارامترهای کینماتیکی منتخب اندام تحتانی حین مانور پرش برشی تک‌پا در فوتبالیست‌های مبتلا به درد مزمن کشاله ران و سالم با رویکرد بررسی مکانیسم‌های جبرانی بود. روش‌شناسی: 32 فوتبالیست حرفه‌ای در دو گروه کنترل و مبتلا به درد در این پژوهش...

Background and Aims Abnormal posture and alterations in movement and muscle activity patterns have been reported in people with upper cross syndrome (UCS). These changes can lead to imbalance in muscle activation, altered movement patterns, and biomechanical changes. The present study aims to investigate the effect of corrective exercises on postur...

The purpose of this study was to examine the effects of rowing stroke rates on lower extremity intra-joint coordination variability in professional rowers. Fifteen experienced young rowers volunteered to participate in this study. Kinematic data were recorded at different rowing speeds with seven Vicon cameras. The continuous relative phase (CRP) a...

Core stability is the ability to control the position and motion of the trunk over the pelvis and legs to allow the optimum production and transfer of force to the terminal segment in sporting activities. The effect of fatigue, especially core muscle fatigue, on stiffness as a performance index requires more study. This research aimed to investigat...

Purpose: Tibiofemoral Varus Malalignment (TFRV) contributes to overuse injuries by altering lower limb biomechanics. Both Posterior X Taping (PXT) and Real Time Feedback (RTF), have each been recommended for subjects with TFRV as they are thought to enhance control of excessive tibiofemoral rotations. This paper evaluates this claim. Methods: A...

Purpose: The purpose of this study was to investigate the effects of specialized Kyokushin karate exercises on the activity of leg muscles and the height of the medial longitudinal arch in adolescent girls with foot pronation. Methods: This study recruited twenty-four adolescent girls with foot pronation who voluntarily agreed to participate and we...

Long-standing groin pain (LSGP) is a common injury in ball games. This study aimed to compare the electrical activity of selected lumbopelvic-hip muscles during a single leg jump-cut maneuver in football players with LSGP and healthy players. Methods: In this case-control study, 32 football players were divided into two groups: LSGP (n=16) and heal...

Objective: The objective of this study was to examine the effects of fatigue on the coordination variability between the trunk, pelvis, and hips during treadmill running. Methods: The kinematics data were recorded during ten successive treadmill steps running at the preferred speed and at 80% and 120% of the preferred speed. The angle segment da...

Measuring the gait variables outside the laboratory is so important because they can be used to analyze walking in the long run and during real life situations. Wearable sensors like accelerometer show high potential in these applications. So, the aim of this study was continuous estimation of kinetic variables while walking using an accelerometer...

Measuring and predicting accurate joint angles are important to developing analytical tools to gauge users' progress. Such measurement is usually performed in laboratory settings, which is difficult and expensive. So, the aim of this study was continuous estimation of lower limb joint angles during walking using an accelerometer and random forest (...

مقدمه و اهداف: مکانیسم غیرطبیعی لگن و زانو اغلب در دوندگان با آسیب های ناشی از دویدن مشاهده می‌شود. مطالعه حاضر به بررسی تأثیر بازخورد بیرونی کلامی بر درد و بیومکانیک حرکتی دوندگان تفریحی که آسیب‌های ناشی از دویدن دارند، پرداخته است. مواد و روش ها: ۲۰ دونده‌ی تفریحی آسیب دیده زن و مرد در این تحقیق حضور داشتند. یک جلسه شامل پیش آزمون بود و در جلسه د...

Background and Aims Athletic groin pain (AGP) is one of the most common injuries among athletes. It causes the use of compensatory mechanisms to adjust pain and affects lumbar-pelvic and hip movements, which leads to prolonging the pain healing process. This study aims to compare the timing of electromyographic activity in selected lumbar-pelvic mu...

Background: Perturbation training which is in the context of volleyball routine practice is a type of neuromuscular exercises that is useful in overhead sports; leads to contraction responses through unpredictable perturbation. Aim: The present study aims to investigate the effects of perturbation training on volleyball players strength propriocept...

Aims and background: This study aimed to investigate the comparison of isokinetic parameters of hip and knee joint muscles in professional soccer players with athletic groin pain (AGP) and healthy ones. Material and Methods: 32 soccer players (control group (n=16) and AGP group (n=16)) who take part in the first and second division league participa...

Background The effect of the Posterior X Taping (PXT) used for subjects with Tibiofemoral Varus Malalignment (TFRV) aimed to control excessive tibiofemoral rotations is still unclear. Further, it is critical to use evidence-based therapeutic exercises to prevent non-contact injuries, especially in repetitive movements. Objective To investigate whe...

Background and Aims: Pyramid and reverse pyramid loading patterns are used in resistance training to increase the training load. Although physiological studies have attempted to compare the two patterns, the difference between the two loading patterns on the biomechanics of the spine and pelvis has not been determined. The aim of this study was to...

Schoolchildren have to carry their backpacks every day on routes with different conditions and slopes. However, the knowledge available on its effects on walking biomechanics is very limited. Therefore, this study aims to evaluate the effects of backpack carriage with 10 and 15 percent weights (which is recommended by researches as optimal weight f...

Abstract Background and aims: Muscle strength is one of the key factors in sports performance, and muscle strength imbalance is considered one of the risk factors in sports injuries. Athletic groin pain (AGP) is a frequent injury among the soccer player and could change the adductor/abductor muscles balance ratio due to the pain. This study aimed t...

Introduction:This study aimed to compare selected kinetic factors during a cross-cutting maneuver in soccer players with athletics groin pain (AGP) and healthy-ones. Materials and Method: twenty-eight soccer players (healthy group (n=14) and AGP group (n=14)) who take-part in the first division league participated in this study. A force-plate via 1...

Anterior Cruciate Ligament (ACL) injuries commonly occur when attention is simultaneously on the environment (other players, objects) and maintaining neuromuscular control. Therefore, our purpose was to investigate lower-extremity coordination following ACLR during a run-to-cut with ecological validity to sport competition. Sixteen male basketball...

Introduction: Impulse is one of the best indexes in ground reaction force characteristics of human movement. Impact also provides further information including the amplitude and duration of applying force . This study aimed to compare vertical impulse during a cutting maneuver between soccer players with athletics groin pain and healthy ones. Metho...

Introduction: Athletic groin pain (AGP) is one of the most common injuries among soccer players . This study aimed to determine whether AGP changes the rate of force development (RFD) during a cutting maneuver in soccer players. Methods: Twenty-eight soccer players (14 healthy, 14 with AGP) who took part in the second division league participated i...

Introduction: The purpose of this research was to compare the coordination variability of lower extremity segments in men with genu varum and healthy men during treadmill running at different speeds . Materials and Methods: Among sports and physical education students, 15 healthy men and 15 men with genu varum voluntarily participated in this resea...

Introduction: The purpose of this study was to determine the effects of different rates of rowing stroke on kinematics of lower extremity joints related to overuse injuries in professional teenager rowers. Materials and Methods: 15 elite young rowers volunteered to participate in this study. Lower extremity kinematic data were recorded during incre...

Symmetry index is one of the criteria for assessing the biomechanical performance status during sports activities. Asymmetry is known as a pathological factor and complete asymmetry or reduction of asymmetry in injured people is used as an indicator to determine the back to sport time. This study aimed to investigate whether groin pain changes the...

Background and Aims: Functional activities in subjects with postural malalignment such as tibiofemoral varus (TFRV) may be associated with movement patterns dysfunction that is associated with non-contact lower extremity injuries. In relation to these people, it is recommended that the design of training protocols should be done with the aim of con...

Background and Aims: Athletic groin pain (AGP) is one of the most common injuries among athletes; Pain uses compensatory mechanisms to modulate it and affects lumbar-pelvic and thigh movements, which leads to a prolonged pain healing process. This study aimed to the comparison of timing electromyography activity of selected lumbar-pelvic muscles du...

Vertical stiffness has been highlighted as a potential determinant of performance and may be estimated across a range of different performance tasks. The aim of the current study was to investigate the relationship between vertical stiffness determined during 9 different hopping tests and performance of vertical jumps. Twenty healthy, active males...

Background: The purpose of this study is to examine the lower extremity intra-segment coordination and variability of road cyclists during pedaling at different intensities. Methods: Eleven semi-professional road cyclists perform four trials at workloads of 50%, 75%, 100%, and 125% of their maximum power output in a randomized order. Thigh, shank,...

Objective: The aim of this study was to examine the effect of hyper pronated foot on postural control and ankle muscle activity during running and cutting movement (v-cut). Methods: In this Cross-Sectional study, 42 young physically active (exercising three times per week regularly) males participated in this study, including 21 with hyper-pronated...

Aims Athletes are always seeking to improve their motor skills and abilities to achieve better records. The complex interaction of biomechanical, physiological, psychological, and bio-motor factors are necessary to achieve optimal performance of sports skills (1). Having this optimal physical fitness is the key to success in many sports, such as sk...

Background: Shoulder impingement syndrome is one of the most common disorders in volleyball players, which can lead to a decrease in athletes' performance by altering their proprioception, muscles imbalances and movement patterns. The purpose of this study was to investigate the effect of eight weeks' focused scapular training on pain, propriocepti...

Background and Aims: Cryotherapy is commonly used in the treatment of acute and chronic athletic injuries. The present study aimed to investigate the immediate effect of cryotherapy on the kinetic factors associated with injury during the side-cutting maneuver in healthy male athletes. Materials and Methods: A total of 14 professional athletes (age...

Introduction: Schoolchildren have to carry their backpacks every day on routes with different characteristics and slopes. However, the knowledge available on its effects on walking biomechanics is very limited. Therefore, this study aims to evaluate the effects of backpack carriage in different weights and gradients on the kinetics of schoolchildre...

Background: Groin pain is one of the common problems in multidirectional sports. The rate and complexity of injury have resulted in prolongation and high rate of this injury. However, there is so far no study that studies accurately the activity of muscle during dynamic and functional activities. Therefore, the aim of this study was to Comparing th...

Background Recently, the use of treadmills for walking and running has increased due to lifestyle changes. However, biomechanical differences in coordination between running on a treadmill or overground have not been adequately addressed. Research question The purpose of this study was to compare coordination and its variability in lower limb segm...

The aerobic endurance is considered an important physiological capacity of soccer players which is examined by Incremental Exercise Test (IET). However, it is not clear how general fatigue induced by IET influences physiological and biomechanical gait features in soccer players and how players recover optimally at post-IET. Here, the effect of gene...

Introduction: Schoolchildren have to carry their backpacks every day on routes with different characteristics and slopes. However, the knowledge available on its effects on walking biomechanics is very limited. Therefore, this study aims to evaluate the effects of backpack carriage in different weights and gradients on the kinetics of schoolchildre...

Background: : Long-standing groin pain (LSGP) is a chronic painful condition resulting in both impaired per- formance and time loss from participation in multidirectional field sport. Research question: : What are the differences in intersegmental coordination strategy and variability of trunk- pelvic and thigh coupling during change of direction in...

Introduction: Nowadays, the use of artificial turf fields has become widespread. Given the high prevalence of noncontact injuries among female soccer players and high contribution of the Anterior Cruciate Ligament (ACL) injury, this research was conducted to compare biomechanical risk factors in the incidence of ACL injury for elite female soccer p...

Objective Proprioception is part of the body's somatosensory system that is responsible for collecting information for the central nervous system to inform about the status of different parts of the body relative to each other. One of the cause of impared proprioception is fatigue. This study aimed to investigate the effect of quadriceps and hamstr...

The aerobic endurance is considered as an important physiological capacity of soccer players which is examined by the Incremental Exercise Test (IET). However, it is not clear how the general fatigue induced by IET influences physiological and biomechanical gait features in soccer players and how players recover optimally at post-IET. Here, the eff...

Background Groin pain is one of the common problems in multidirectional sports. It seems that abnormal muscular activity and improper movement strategy led to prolongation and high rate of this injury. Therefore, the aim of this study was to Comparing the Average amplitude of Electromyography (AEMG), co-contraction ratio (CCR) of selected thigh an...

Background and Aim: Direct and indirect complications of diabetic peripheral neuropathy can lead to imbalance and falls, and it may increase the risk for plantar ulcer. Therefore, performing effective trainings to increase balance probably reduces the risk of falling in these patients. Thus, the aim of the present study was to investigate the effec...

The most common side effect of physical activity is the risk of musculoskeletal damage, that anterior cruciate ligament injury is the most common one. Purpose of the study is comparing the effect of six weeks of comprehensive injury prevention training on anterior cruciate ligament with internal and external feedback on the proprioception and kn...

Background: Patellofemoral pain syndrome (PFPS) is sometimes related to excessive hip adduction and internal rotation, as well as knee valgus during weightbearing activities in females. Research on injury prevention and rehabilitation strategies has shown the positive effects of valgus control instruction (VCI) exercise programs in training. Hypo...

Background Signs and symptoms of impaired function of the musculoskeletal system may be targeted by treating dysfunction located elsewhere. Hypothesis Abdominal control feedback and scapular stabilization exercise interventions would result in positive changes in pain intensity, strength, electromyography, and flexion-relaxation phenomena in women...

Background and Aim: The knee joint is one of the most complex and largest synovial joints in the body, which is injured in sports injuries and accidents, due to its location and the type of physical stress it entails. Also, no previous research has reviewed the difference between the mechanics of patients' and athletes' tissue in the form of ultras...

Context: Female volleyball players are more predisposed to anterior cruciate ligament (ACL) injury in comparison with their male counterparts. Recent researches on ACL injury prevention strategies have shown the positive results of adopting the external focus (EF) of attention in sports. Objective: This study aimed to determine the effect of six...

Background and Aim: Knowing the changes of lower limb joint angles during landing result in good fundamental understanding to prevent Knee injuries in people with flatfeet. Hence, the purpose of this study was to compare of lower limb angles as ACL risk factor during single leg drop landing between athletes with flatfeet and normal. Materials and...

Aim: The aim of this study was to compare the Tarara performance test scores in active males with and without abnormalities of the knee Methods: 60 active men with and without genu varum and genu valgum abnormalities (each group 20 men) purposefully selected and participated in this study. deformities were measured using caliper. Then, participants...

Background and Aim: Vertical jump is seen in many sports activities and it use in many biomechanical researches. The purpose of this study was to investigate the effect of four weeks training on variability of ground reaction forces (GRF) during vertical jump in active young men. Materials and Methods: Twenty young men (exercise group: agd: 21.20 ±...

Abstract Quantifying dynamic stability of athletic skills help to identification of motor behavior complexity to reduce injury and improve performance. The purpose of this study was to evaluate the effects of training on local dynamic stability in vertical jump maneuver. Twenty young male subjects (control (n=10), exercise (n=10)) participated in t...

Introduction: Numerous types of cost functions such as minimum torque (MT), minimum torque change (MTC) and mechanical energy cost (MEC) models have been suggested to characterize human movement features from the per¬spective of optimal control theory. Some researchers believe, the stability cost (SC) model, considers the dynamic aspects of movemen...

Introduction: Plyometric exercises (PE) cause muscles to exert maximum strength during shortest possible time and the basis of these exercises is stretch-shorten cycle in muscular contraction (1). Whole Body Vibration Training (WBVT) has been introduced recently and it is believed that it has the same effects as PE in shortest time (2). During thes...

Introduction: Stiffness is a mechanical properties of viscoelastic structures which researchers have believed it has three important function in body mechanism: it adjusts rate of force development in system, determine force storage capability for stretch-shorten cycle, and determine system resistant against perturbations (system stability). Theref...

Introduction: Isokinetic Dynamometer is one of the most common methods of measuring muscles’ performance that is used for diagnosing imbalances between force and torque in muscles around the joints in order to prevent injury. But it should be noted that measuring imbalances between the muscles around the joints should not be limited to measuring th...

Normal curvature of the spine might be changed as a result of its non-fixed feature. The aim of this study was to investigate the relationship between height, weight and body mass index (BMI) with curvature of the spine kyphosis and lordosis in 12-15year-old male adolescents of Tehran. This was a correlational study in which 97 accessible healthy b...

The purpose of this study was the comparison of time to stabilization in pronated and supinated foot in jump-landing with emphasis on foot structure and sensory information. Twenty-seven male students (age:23.29±1.65 yr, weight:70.17±7.77 kg ) that They divided in pronated, supinated and normal foot using navicular drop test, participated in this s...

The main purpose of this study was to consider the relationship between Selected ankle and knee Isokinetic Parameters and maximum height reaches during double and single legs vertical jump. 28 male students from department of physical education and sport sciences volunteered. Isokinetic parameters including of the knee and the ankle were measured b...

The aim of this study was to compare the peak Vertical Ground Reaction Forces (VGRF) and Rate of Loading (ROL) between supinated, pronated, and normal feet during single leg drop-landing. Thirty healthy male students from physical education & sport sciences department participated in this study and assigned to one of three groups by navicular drop...

The jump-landing is movement that repeatedly used in the sports activities. Successful landing require the stability to prevention of injuries. With respect to muscle strength role in stability after landing, the purpose of this study was to determine the relationship between peak torques of lower limb muscles with dynamic stability. 15 healthy sub...

Shock absorption and reducing the Rate of Loading (ROL) during daily activities are considered as a reason for reducing the rate of injuries. Since, skeletal muscles utilize as shock absorber during weight bearing tasks, the purpose of this study was to examine the relationship between the maximum torques of lower extremity muscles with the ROL dur...

The purpose of this study was comparison between pronated and supinated foot with dynamic stability in jump-landing task. Twenty-seven men students of Tarbiat-moallem University(23.9±1.65yr, 70.17±7.77kg) that any had lower extremity and head injuries, participated in this study. By navicular drop test, subjects were assigned to 1 of 3 groups: (pro...