AmirAli Jafarnezhadgero

• Ph.D (Associate Professor of Biomechanics)
• Head of Department at University of Mohaghegh Ardabili

The link between gait parameters and hearing loss is not well understood. The objective of this study was to investigate the effects of the gait ground reaction forces, their time to peak, vertical loading rate, impulses and free moment during gait in deaf and hearing children. Thirty male children were equally divided into a healthy group and a gr...

Background. Dynamic balance is often assessed in athletes using either the Star Excursion Balance Test (SEBT) or the Y Balance Test (YBT). There is evidence that the results for the three common directions are not comparable. Thus, the question is open to debate as to which instrument is better suited to measure training-induced changes over time....

Introduction The purpose of this study was to determine the effects of motor control training on pain, disability and motor control indices in patients with nonspecific low back pain (NSLBP) and movement control impairment (MCI) and also to evaluate the correlation between the changes in disability and the motor control indices. Methods Thirty peo...

Abstract Purpose: Type 2 diabetes is the most common type of diabetes and accounts for 90% of all cases. Although, diabetes has the ability to make the patient suffer movement problems. Therefore, the purpose of this study is to investigate the effect of rehabilitation exercises on the mechanics and physiology of transitional movements in people w...

Abstract Introduction: One of the common undesirable postures that poor mobility has brought to humans due to the significant growth of technology and the widespread use of tools and communication devices is the excessive increase of the back arch (hyperkyphosis) and forward head deformity. Therefore, the aim of this research is to review the effe...

Abstract: (93 Views) Introduction: The ankle joint is one of the most vulnerable joints in the body due to weight bearing. Pronated foot is one of the most common complications of the lower limbs. The present study aimed to determine the effect of double-density soles on the loading rate, impulse, free moment, and ground reaction forces in adolesce...

Abstract: (85 Views) Introduction: An increase in the peak vertical ground reaction force during running has been reported in overweight people, which can further disrupt mobility and quality of life. This research aimed to compare the frequency spectrum of the vertical ground reaction force in ten areas of the foot in overweight people compared to...

Background This study investigates the effects of a fatiguing exercise on lower limb electro-myographic activities and co-contraction in overweight females compared with normal weight females during running. Methods Forty-eight females were divided into two groups. The first group included individuals with a normal body-mass-index. The second grou...

Abstract Purpose: Type 2 diabetes is the most common type of diabetes and accounts for 90% of all cases. Although, diabetes has the ability to make the patient suffer movement problems. Therefore, the purpose of this study is to investigate the effect of rehabilitation exercises on the mechanics and physiology of transitional movements in people w...

Introduction: The elderly population faces numerous challenges threatening their quality of life, autonomy, and mobility. Therefore, it is essential to implement activities that address and enhance these issues. This study aimed to examine the effects of rehabilitation exercises on the mechanics of transitional movements among the elderly. Methods:...

Anterior cruciate ligament reconstruction (ACLR) is one of the most critical interventions for athletes aiming to return to their pre-injury level of performance.¹ However, the success of this surgery depends not only on surgical technique but also on postoperative rehabilitation protocols. Although ACL reconstruction techniques have advanced signi...

Abstract Purpose: Knee valgus is a lower limb abnormality in which the knees incline inward. Therefore, the aim of this study was to investigate the effects of rehabilitation exercises and therapeutic interventions on the mechanics of transfer movements in individuals with knee valgus. Methods: For this review, articles in both Persian and English...

Abstract Purpose: Knee valgus is a lower limb abnormality in which the knees incline inward. Therefore, the aim of this study was to investigate the effects of rehabilitation exercises and therapeutic interventions on the mechanics of transfer movements in individuals with knee valgus. Methods: For this review, articles in both Persian and English...

Background The analysis of ground reaction forces and muscle activities during walking or running can help clinicians decide on the usage of foot orthoses, particularly in individuals with pronated feet. Here, we aimed to investigate the effects of double- density foot orthoses on running kinetics and lower limb muscle activities in adults with and...

Background Foot pronation is one of the risk factors for lower limb injuries during running and walking. It seems that sand training can be a promising intervention for treating foot pronation. Objective This study aimed to investigate the effect of long-term sand training on the electrical activity of lower limb muscles during walking in men with...

A B S T R A C T Anterior Cruciate Ligament (ACL) injuries are among the most common sports and orthopedic injuries, significantly affecting an individual's physical performance. Treatment varies based on the severity of the injury and the patient's activity level. For partial tears or individuals with lower physical demands, non-surgical approaches...

Objective: Foot pronation is a common lower limb deformity that can affect human movement mechanics. Therefore, this study aimed to compare the frequency spectrum of ground reaction forces (GRFs) during walking with and without the use of an anti-pronation insole in individuals with pronated feet. Methods: Twenty men with pronated feet (mean age: 2...

Background and Objective: Gait is a fundamental movement pattern influenced by various structures. This study aimed to determine the effect of sand-based training on ground reaction force frequency spectrum in individuals with anterior cruciate ligament (ACL) reconstruction and pronated feet during gait. Methods: This clinical trial was conducted o...

Objective Research has shown that exercises using the Wim Hof Method can positively affect the immune system. Therefore, this study aims to systematically review the impact of meditation, breathing exercises, and cold exposure using the Wim Hof Method on the autonomic nervous system. Methods This study is a systematic review. The number of articles...

Running is one of the most popular physical activities in the world and is usually done on different surfaces. Different levels of running are associated with overuse injuries. Therefore, this study aimed to evaluate the effect of eight weeks of training on artificial grass, natural grass, and synthetic surface on ankle joint co-contraction during...

Abstract Previous studies showed that anterior cruciate ligament reconstruction has a significant effect on body mechanics during transition movements. The aim of the present study was to review the body mechanics during transition movements in people with anterior cruciate ligament reconstruction. The present study was a review article. The search...

Background: The type of footwear worn by military personnel and others could increase the risk of overuse injuries. Objectives: This study aimed to compare muscular activity during running with new and used military boots and running footwear in healthy individuals. Methods: Thirty healthy males were given a new pair of running footwear (n = 15) an...

Biomechanics is the knowledge that shows what forces enter the motion system of the human body and how it causes human movement. Therefore, the aim of this Meta-Analysis study was to review the studies conducted in the field of the effects of training on sand surface on biomechanics and physical fitness factors of human body during translational mo...

Body mass index (BMI) is one of the indicators used to detect body weight and nutritional status. Excessive weight can affect the occurrence of pronated feet (PF) compared with who have normal weight. Therefore, this study aims to Interaction of overweight and foot pronation on ground reaction force frequency content. 104 young male and female adul...

Abstract Purpose: Low back pain is a common problem in world and one of the most common causes of physical disability. The aim of this review study was to investigate the effects of rehabilitation exercises with a central muscle stabilization approach on kinetic, kinematic and electromyographic variables during walking, running, trunk flexion and...

This systematic review aimed to evaluate the effects of various corrective exercises and supportive tools in individuals with genu valgum. To ensure a comprehensive review, a search for original research, review articles, and clinical trials in both Persian and English was conducted using databases such as WOS, SID, ISC, Magiran, Scopus, PubMed, an...

In general segmentation, review studies are divided into two groups: narrative reviews and systematic reviews. The research methods for narrative and systematic reviews are completely different. Narrative review articles can be written based on the interests of the researcher, which is one of the weaknesses of this style of review, while systematic...

Background and Aims The present study aimed to investigate the effect of a course of practicing motor games based on Montessori theory on the fine and gross motor skills of children with attention-deficit/hyperactivity disorder. Methods The present research was quasi-experimental. This study was done using a pretest-posttest design on 30 male stude...

Background: The age of boots is a significant factor that can impact the risk of injury during daily activities. Conversely, military personnel rely on their footwear to meet the physical demands of their daily professional tasks. Objectives: This study aimed to evaluate how wearing thermoplastic polyurethane (TPU) and rubber military boots for six...

Foot pronation is a prevalent condition known to contribute to a range of lower extremity injuries. Numerous interventions have been employed to address this issue, many of which are expensive and necessitate specific facilities. Gait retraining has been suggested as a promising intervention for modifying foot pronation, offering the advantage of b...

Background and Aims Moving on steep surfaces is a demanding task in daily life, especially during walking. It poses challenges for the human locomotor system, especially for those with neuromuscular injuries or disease. Therefore, this study aimed to compare plantar pressure variables in healthy versus genu valgum students during walking on a slope...

Foot orthoses (FO) are frequently used medical devices to correct lower limbs malalignment in the form of excessive foot pronation. This systematic review with meta-analysis aimed to investigate the effects of short-term FO application on walking kinematics and kinetics in adults aged ≥18 years with excessive foot pronation. Five electronic databas...

Abstract Background and Objective: Fatigue is one of the effective factors in changing the electrical activity of muscles, so that this index is directly related to the increase in the potential of muscle injuries and performance loss in various sports stages. Therefore, the aim of the present study was to compare the electrical activity values of...

Foot pronation, as one of the prevalent foot abnormalities, can influence the biomechanics of the lower limbs. The use of various foot orthoses, including insoles and braces, is very common in eliminating this problem. The results obtained regarding the effect of orthoses on pain and biomechanics of individuals with foot pronation are different. Th...

A B S T R A C T A Letter to the Editor (LTE) is a brief communication to a journal’s editor or editorial team. It is usually written in response to a recent publication within the journal but can also cover an unrelated topic of interest to the journal’s readership. Many journals welcome LTEs within a dedicated section (e.g. LTEs/Correspondence) to...

Purpose: Pronation in the foot is a normal rolling movement occurring at the subtalar joint during running. The human foot, as the primary interface with our environment, presents morphological and postural changes following prolonged running. This study aims to identify running mechanics while training on the sand in runners with pronated feet. Me...

Abstract Background and Objective: Pronate foot as one of the most popular abnormalities can effect lower limb biomechanics. Consuming different types of insoles and braces is common in this abnormality treatment. There are various results related to effect of orthoses in pain and biomechanic of pronated foot patients. Therefore, the aim of this s...

Abstract: Obesity has become a global problem that can affect the mechanism of running in obese people. Abnormal running pattern can lead to skeletal-muscular disorders and subsequently a decrease in the absorption of shocks due to physical activity, an increase in knee and back pain, an increase in the joints’ instability, a reduction in the time...

Researches in recent decades show that rehabilitation has a significant effect on the improvement of knee complications. Therefore, the aim of this study was to review the effect of various exercise protocols and the use of support tools on transitional movements’ mechanics in the older adults with knee osteoarthritis. The current study was a libra...

Background and Objectives: Over‑pronated feet (OPF) is a common abnormality of the foot. Sand can be changed lower limb muscle activities. Therefore, the aim of this study was to evaluate the effect of sand exercise program on knee muscle co-contraction in runners with over‑pronated feet. Materials and Methods: Thirty individuals (age range: 18–26...

Background Running exercise is an effective means to enhance cardiorespiratory fitness and body composition. Besides these health benefits, running is also associated with musculoskeletal injuries that can be more prevalent in individuals with excessive body weight. Little is known regarding the specific effects of overweight and foot pronation on...

Background Although the effects of footwear type on joint stiffness have previously been investigated, researchers did not consider foot flexibility. Thus, the present investigation aimed to determine the interaction effects of footwear type, static navicular drop and dynamic ankle pronation on dynamic joint stiffness in running. Research question...

Background and Aims Weakness in the knee muscles and other components of the knee joint can cause various complications, including the genu varum. This study aims to investigate the effects of eight weeks of running on a treadmill and on the ground on muscle activities in individuals with genu varum. Methods This is a quasi-experimental and laborat...

Abstract Background & Aims: Fatigue is one of the effective factors in changing the electrical activity of muscles, so that this index is directly related to the increase in the potential of muscle injuries and performance loss in various sports stages. Therefore, the aim of the present study was to compare the electrical activity values of the low...

Introduction: One of the best interventions in the field of reducing injury and improving performance is running shoes. Despite this, the research results show that achieving the desired result due to using shoes depends on paying attention to other influencing factors such as foot structure. Therefore, the present study was carried out with the ai...

Background and Aims The increase in loading rate is associated with lower limb injuries such as tibial stress fracture. Quadriceps muscle activities absorb ground reaction force (GRF) shocks by eccentric activation. This study aims to evaluate the effect of aerobic training on the relationship between loading rate and quadriceps muscle activities i...

Background and Aims Adipokines have a major role in aging pathobiology and age-related diseases. The present study aims to evaluate the effect of 12 weeks TRX on irisin and chemerin levels in older men. Methods In this randomized clinical trial, 16 older men (Mean age=62.06±1.53 years) were selected using a convenience sampling method and randomly...

Background: Cognitive interventions are among the effective training-on-gait parameters; however, the effects of such trainings on inter-joints coordination has not been much considered. Research question: Can dual task and executive function training affect inter-joint coordination during walking in elderly with poor balance? Methods: Thirty...

Background and Aims Genu varus is one of the most common lower limb deformities that can affect a person’s daily activities and sports performance. This study aims to investigate the effect of the 8-week use of knee braces on the electrical activity frequency of muscles in men with genu varus during walking. Methods This is a quasi-experimental stu...

Abstract: A Letter to the Editor (LTE) is a brief communication to a journal’s editor or editorial team. It is usually written in response to a recent publication within the journal but can also cover an unrelated topic of interest to the journal’s readership. Many journals welcome LTEs within a dedicated section (e.g. LTEs/Correspondence) to stim...

Introduction: One of the best interventions in the field of reducing injury and improving performance is running shoes. Despite this, the research results show that achieving the desired result due to using shoes depends on paying attention to other influencing factors such as foot structure. Therefore, the present study was carried out with the ai...

his study aimed to compare men and women on muscle strength, pain, physical function, and gait spatiotemporal parameters at three speeds, verifying the correlation between variables. Forty-two individuals with KOA (21 women) participated in this cross-sectional study. They were assessed using the visual analog pain scale (VAS) and Western Ontario a...

Background and Aims People suffer from neck pain, headache, kyphosis and back pain while working with the computer for a long time, which seems to increase day by day with the advancement of technology. The present study aims to investigate the effect of two types of thoracolumbosacral braces (with and without sensors) on electromyography activity...

Purpose: Military boots mileage is a main factor that can affect the risk of running injuries. The present study aims to evaluate the effect of three types of military boots mileage on knee muscular co-contraction during running. Methods: Fifteen healthy males received three pairs of new military boots. Participants wore these boots for more than 6...

Introduction: Pronated foot, as one of the common foot abnormalities can affect the biomechanics of the lower extremity. The purpose of the present study was to investigate the scientific research related to the application of various exercise protocols on foot pronation complications, as well as to make favorable summary and provide more appropria...

Background. Due to the special structure of the knee joint in genu valgus individuals, neuromuscular characteristics of muscles can be disturbed and this may change postural control. This study aimed to investigate the effect of 8 weeks of training with an elastic band on the frequency spectrum of lower limb muscles in genu valgum patients during r...

Background: Running on sand could be a method for the rehabilitation of individuals with anterior cruciate ligament reconstruction and pronated feet. However, there is a lack of knowledge about the effects of running on sand on running biomechanics and muscle activities. Research question: What is the effect of sand training on running mechanics...

Today, many people in society choose running as a general or special activity in order to improve their physical and physiological capabilities. Choosing the right shoes in endurance running can have a great impact on the athlete's performance. Physiological energy economy and maximal oxygen consumption are of particular importance not only among r...

Introduction: Patellofemoral pain syndrome is one of the most common musculoskeletal disorders of the knee area. Previous studies have pointed to the positive effects of exercise. Therefore, it is very important to check the types of exercise protocols for the treatment of this condition. The purpose of the present study was to investigate the scie...

Anatomy And Kinsiology

Creation a relationship between athletes and physical closeness between them can increase the risk of coronavirus at during team and group training. Therefore, the aim of the present study was to design a new smart training tool for ball sports in order to use at pandemic covid-19 period. This training tool includes 4 fixed mechanical rods to insta...

Purpose: Pronated feet (PF) are associated with biomechanical changes during running. It seems that sand training can be a suitable intervention for rehabilitation in individuals with over-pronated feet. This study aims to investigate the effect of long-term exercises on the sand on the frequency of lower limb muscles during running in runners with...

Background and Aims Different shoe weights affect the gait mechanics. Some dynamic changes or adjustments induced by anterior cruciate ligament (ACL) reconstruction can be assessed through the analysis of the ground reaction forces (GRFs). This study aims to determine the effect of sports shoe weight on gait kinetics in athletes with ACL reconstruc...

Introduction: Weightlifting is a sport that is performed in different weights. The purpose of the present study was to investigate the effect of different degrees of weight loss on the values of ground reaction force during the lift movement in elite weightlifters. Methods: The current research was semi-experimental. The statistical sample of the r...

Background Autism spectrum disorder is a developmental disability with first signs appearing in children aged 3 years and younger. Given that autism spectrum disorder is accompanied by a broad range of symptoms such as impaired sensory, neurological, and neuromotor functions, it appears plausible to argue that an intervention program focusing on mu...

Purpose: This study aims to assess the effects of an 8-week core stability training on the kinematics and kinetics of trunk flexion and extension motions in patients with chronic non-specific low back pain (CNSLBP). Methods: A total of 30 CNSLBP patients with the age range of 25 to 45 years were randomly divided into 2 equally sized groups. The su...

A B S T R A C T Objective Wrestling is one of the sports that have a high percentage of injuries. Therefore, the aim of this study was to review physiological and biomechanical injuries in the field of wrestling. Methods The present study was a library-based and systematic review. The search for articles in Persian and Latin was conducted from 2010...

A B S T R A C T Objective Obesity and overweight have become global problems that can affect the mechanics of running in affected individuals. Therefore, the aim of the present study was to review the mechanics of running in obese or overweight individuals. Methods The present study was a library and systematic review. The search for articles in Pe...

AbstractIntroduction: Anterior cruciate ligament (ACL) tears are a common sports injury, the incidence of which is increasing due to the population's increased participation in sports activities. ACL tears can lead to serious knee complications, including cartilage damage, meniscus tears, and osteoarthritis. This systematic review aimed to examine...

Background: There is evidence that fully recovered COVID-19 patients usually resume physical exercise, but do not perform at the same intensity level performed prior to infection. The aim of this study was to evaluate the impact of COVID-19 infection and recovery as well as muscle fatigue on cardiorespiratory fitness and running biomechanics in fem...