Ali Sharifnezhad

Ali Sharifnezhad
Sport Sciences Research Institute of Iran | SSRI · Department of Sport Biomechanics and Technology

PhD (Humboldt University Berlin)

About

57
Publications
12,339
Reads
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195
Citations
Citations since 2017
40 Research Items
182 Citations
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201720182019202020212022202301020304050
201720182019202020212022202301020304050
Introduction
I got my PhD on Sport Biomechanics at Humboldt University Berlin/Germany and currently work as an assistant professor at Sport Science Research Institute of Iran as well as administrate web site of Student committee on European Society of biomechanics. My research interest is: - The influence of exercise-based interventions on muscle-tendon mechanical properties and functional limitation in clinical and healthy populations.
Additional affiliations
July 2018 - April 2020
Sport Science Research Institute
Position
  • CEO
April 2017 - June 2018
Sport Science Research Institute
Position
  • Vice President
June 2014 - April 2017
Sport Science Research Institute
Position
  • Laboratory Manager
Education
June 2009 - February 2014
Humboldt-Universität zu Berlin
Field of study
  • Sport Biomechanics

Publications

Publications (57)
Article
Full-text available
Purpose The aim of the current meta-analysis was to examine the extent to which there are differences in upper extremity motor synergies across different age groups in manipulative tasks. Methods The studies that used the uncontrolled manifold method to examine the effect of age on motor synergies in multi-joint and multi-finger tasks were selecte...
Article
Full-text available
This study assessed the effects of movement-based interventions on the complexity of postural changes during prolonged standing. Twenty participants, equally distributed in gender and standing work experience (SWE), completed three simulated prolonged standing sessions: without movement (control), leg exercise, and footrest. The amount and complexi...
Article
Full-text available
Background: Skilled athletes' optimal performance might be due to their postural ability to counteract perturbation. However, how expertise influences coordination of anticipatory postural adjustment (APA) and main movement under temporal pressure needs more investigation. This study aimed to investigate how available time (temporal pressure) for c...
Article
Objective The present study aims to evaluate the effects of posture, task, and handgrip style on discomfort, neck kinematics, and concomitant muscular activity when using a smartphone (SP). Background Along with the popularity of smartphones, musculoskeletal disorders have become prevalent among smartphone users. However, comprehensive aspects of...
Article
Full-text available
Stiffness of ankle joint has been investigated in a wide range of biomechanical studies with a focus on the improvement of performance and reduction in the risk of injury. However, measuring ankle joint stiffness (AJS) using the existing conventional methodologies requires sophisticated equipment such as force plate and motion analyses systems. Thi...
Article
Purpose Nonlinear analysis techniques provide a powerful approach to explore dynamics of posture-related time-varying signals. The aim of this study was to investigate the fundamental interactions between postural variability structure and discomfort development during prolonged standing. Methods Twenty participants, with equal distribution for ge...
Article
Full-text available
Change in propagation velocity of of electomyographic signals has been reported after fatiguing exercise and as well as after eccentric exercise induce muscle fiber damage, most likely due to change in membrane permeability of muscle fibers. Both mean power frequency (MPF) and conduction velocity (CV) has been used to estimate change in propagation...
Article
Full-text available
The purpose of this study was to determine the effect of three different ankle braces using the Maximum Lyapunov exponent on local dynamical stability of individuals with chronic ankle instability during running. Twelve subjects with chronic ankle instability as an injured group and 12 healthy individuals participated in this study. the injured gro...
Article
Full-text available
Objectives: The present study evaluated the inter-rater and intra-rater validity and reliability of posturography by Kinovea software to measure the thoracic kyphosis and lumbar lordosis. Methods: Eighteen subjects (10 females & 8 males) referring for radiographic imaging were included in this cross-sectional study. For evaluating the validity, the...
Article
Optimal performance of complex Forehand stroke needs coordination between postural adjustment and focal movement. the purpose of this study was to investigate the relationship between onset time and magnitude of Anticipatory Postural Adjustment (APA) and constant and variable error of Table Tennis Forehand stroke among skilled and novice players. F...
Article
Full-text available
The Human three-dimensional (3D) musculoskeletal model is based on motion analysis methods and can be obtained by particular motion capture systems that export 3D data with coordinate 3D (C3D) format. Unique cameras and specific software are essential for analyzing the data. This equipment is quite expensive, and using them is time-consuming. This...
Article
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Background: Smartphones (SPs) are widely used by people of all age groups and genders. Users spend many hours per day on the SPs for different purposes, which imposes significant stress on the musculoskeletal system. Objectives: This study explored head forward flexion, lateral bending angle, and viewing distance while working with an SP in sitt...
Article
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Purpose: In spite of mounting evidence indicating that concentric and eccentric knee extensor muscle contractions might have special nervous system control strategies, the differentiation of brain frequencies between concentric and eccentric movements and how the motor cortex programs this contraction has been less studied. In this study, the brain...
Article
Some sport activities such as skiing causes athletes to be constantly exposed to vibrations caused by rough terrain which can lead to muscle fatigue in many repetitions. The purpose of this study is to investigate the effects of musculoskeletal fatigue on vibration transmissibility coefficient and muscle activity in subjects are exposed to floor vi...
Article
Background and Aim: Past studies showed that there are different models of the foot in terms of appearance and size of the toes, including Egyptian, Roman, Greek, Semi-Roman and square feet. But no information is available on the features of the Iranian foot. The purpose of this study is to obtain the Iranian foot model using statistical and image...
Article
Full-text available
Different studies have shown the advantage of the external focus of attention using relatively simple variables. The aim of this study was to investigate the constrained action hypothesis by underlying neurophysiological mechanisms tests of the lower extremity muscle in vertical jump under the impression of Focus of Attention Types. For this purpos...
Article
Full-text available
Plate foot pressure is the pressure that exists between the foot and the surface under it. Information extracted from such pressure is used for research on gait, balance, shoe design, sport biomechanics and injury prevention. Therefore, it is necessary to develop methods and systems for measuring pressure. The purpose of this study was to design an...
Article
Lower limb joint’s torsional stiffness is directly related to the individual’s performance and probability of injury when landing. There are various methods of calculating ankle, knee, and hip joint’s torsional stiffness in which the reliability of the achieved values by them are highly controversial. The purpose of this research is to provide a ne...
Article
Full-text available
Background and purpose Hand tremor is a disturbing yet sometimes resistant symptom in persons with Parkinson disease (PD). Although many exercise regimens for these people have gained attention in recent years, the effect of resistance training and especially eccentric training on parkinsonian tremor is still uncertain. This study was conducted to...
Article
Full-text available
Context Hopping exercises are recommended as a functional training tool to prevent lower limb injury, but their effects on lower extremity biomechanics in those with chronic ankle instability (CAI) are unclear. Objective To determine if jump-landing biomechanics change after a hop-stabilization intervention. Design Randomized controlled clinical...
Article
Introduction: To examine the effects of a 6-week hopping exercise program on time to stabilization and perceived stability among athletes with chronic ankle instability. This is a randomized controlled trial. Materials and Methods: A total of 28 basketball players with chronic ankle instability (Mean±SD age; 22.67±2.88 y, Mean±SD weight: 80.47±8.48...
Article
Full-text available
Different studies have shown the advantage of the external focus of attention using relatively simple variables. The aim of this study was to investigate the constrained action hypothesis by underlying neurophysiological mechanisms tests of the lower extremity muscle in vertical jump under the impression of Focus of Attention Types. For this purpos...
Article
Anterior cruciate ligament (ACL) injury is one of the most common injuries in high-demand sports. Due to long-term treatment of this injury, diagnosing recovery of ACL becomes important, particularly six months postoperatively. The purpose of this research is to provide a cost-effective and intelligent method to diagnose ACL's health status. For th...
Article
Full-text available
Background: Knee valgus angle appears to be a key factor in both primary– and second–ACL injury risk models. The control of the alignment of the lower limb during dynamic movements depends on the neural activation of the muscles crossing the knee joint prior to the occurrence of stressful events. The current study examined the relationship between...
Article
Full-text available
Plate foot pressure is the pressure that exists between the foot and the surface under it. Information extracted from such pressure is used for research on gait, balance, shoe design, sport biomechanics and injury prevention. Therefore, it is necessary to develop methods and systems for measuring pressure. A portable system is useful for stability...
Article
Full-text available
The purpose of this study was applying a set of social network methods to identify the specific properties of self-organized maps in football teams. network metrics were organized on “meso” and “micro” analysis levels. 3 official matches of the national Iranian team on world cup 2018 were analyzed. An overall of 577 offensive plays was analyzed fro...
Conference Paper
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Athletes’ gait should be meticulously analyzed in order to let them get the best performance while practicing and rehearsal. In this research, a previously introduced smart insole has been developed and redesigned in order to make it more efficient and versatile. Unlike the previous version, the new version is totally wireless and subtle. This inso...
Article
Full-text available
A growing body of evidence indicates that different neural control strategies may exist for human contractions. This brief systematic review focuses on the specificity of the control strategy used by the central nervous system during eccentric contractions. The findings of previous studies indicate the effects of eccentric exercise on cortical regi...
Article
Context: Neuromuscular control deficit has been reported in people with chronic ankle instability (CAI) and hopping exercises have been recommended as a functional training tool to prevent lower limb injury, but its effects on lower extremity neuromuscular control in those with CAI are unclear. Objective: To investigate the effect of hop stabili...
Article
Full-text available
هدف این مطالعه، بررسی ارتباط بین حداکثر گشتاور مفاصل اندام تحتانی با حداکثر نیروی عکس‌العملزمین در تکلیف فرود تک‌پا بود. 30 ورزشکار به‌صورت داوطلبانه در این مطالعه شرکت کردند. متغیرهای کینتیکی و کینماتیکی اندام تحتانی طی فرود تک‌پا، توسط دستگاه تحلیل حرکت و صفحه‌نیرو جمع آوری شدند. نتایج آماری نشان داد که ارتباط معناداری بین حداکثر گشتاور فلکشن، اد...
Article
Full-text available
Change in muscle fiber conduction velocity (MFCV) has been reported after eccentric exercise induces muscle fiber damage, most likely due to a change in membrane permeability of the injured fiber. The extent of damage to the muscle fiber depends on the morphological and architectural characteristics of the muscle fibers. Morphological and architect...
Article
Full-text available
Recently, various rehabilitation robots have been developed for therapeutic exercises. Additionally, several control methods have been proposed to control the rehabilitation robots based on user’s motion intention. One of the common control methods used is torque-based impedance control. This paper presents an electromyogram-based robust impedance...
Article
Full-text available
This paper proposes a new inexpensive soft force sensor suitable for soft robotics applications that require high flexibility and wide range of sensing area. All Hall Effect sensors developed so far use a Hall Effect sensor to detect the magnetic field of a piece of solid magnet. The proposed force sensor in this paper uses a Hall Effect sensor to...
Conference Paper
Introduction: Repetitive sock loads are the results of interaction between human musculature system and the ground during daily tasks such as walking. The magnitude and the frequency of these loads are functions of muscle activity and shoe-ground stiffness parameters. Soft tissue vibration is one result of these loads and its characteristics could...
Article
Full-text available
The present study investigated the longitudinal growth of the vastus lateralis (VL) muscle using four eccentric exercise protocols with different mechanical stimuli by modifying the load magnitude, lengthening velocity and muscle length at which the load is applied. Thirty-one participants voluntarily participated in this study in two experimental...
Thesis
Full-text available
In der vorliegenden Studie wurde daher den Einfluss exzentrischen Trainings, mit unterschiedlicher Reizmagnitude, Bewegungsgeschwindigkeit und Muskellänge bei Reizapplikation, auf die Adaptation des M. vastus lateralis (VL) untersucht. Die 31 Studienteilnehmer wurden randomisiert in zwei Trainings- und eine Kontrollgruppe aufgeteilt. Die Trainingsg...

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Projects

Projects (8)
Project
1-Design and fabrication of the head support exoskeleton 2-Registering the head support exoskeleton patent 3-Evaluating the neck and shoulder muscular activity (EMG) in EXO/Without EXO condition during performing overhead work