Mahmood Reza Azghani

Sahand University of Technology

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mandana rezaei

Tabriz University of Medical Sciences

Zahra Salahzadeh

Tabriz University of Medical Sciences

Teimour Allahyari

Urmia University of Medical Sciences

Fariborz Rahimi

University of Bonab

Hamid Reza Khalkhali

Urmia University of Medical Sciences

Reza Eyvazpour

Iran University of Science and Technology

Nazila Salahshour

University of Bonab

Zanyar Karimi

Urmia University of Medical Sciences

Dariush Gouran Savadkoohi

Tehran University of Medical Sciences

Sina Sari Aslany

Sahand University of Technology

Cooperative Institutions

Tabriz University of Medical Sciences

Tehran University of Medical Sciences

Sahand University of Technology

University of Tabriz

Iran University of Medical Sciences

Tarbiat Modares University

Shahid Beheshti University of Medical Sciences

Urmia University of Medical Sciences

Urmia University

University of Social Welfare and Rehabilitation Sciences

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PubMed (2015)

Mojtaba Mirakhorlo Mahmood Reza Azghani

Lifting is known to be a major reason for musculoskeletal injuries. In this way, lifting has a crucial effect on human musculoskeletal system and intensity of this impact depends slightly on the selection of techniques. Underlying mechanisms by which trunk muscles are executed during performing lifting are central to biomechanical study of lifting techniques. In the current study, the trunk muscular control mechanisms of lifting are investigated using the synergetic control analysis. Non-negative matrix factorization has been used to extract trunk muscles synergies from their activities - which are computed by a previously validated musculoskeletal model - during different lifting techniques aimed to investigate motor control strategies. Three lifting techniques are considered; stoop, squat and semi-squat. Three synergies account for variety among muscle activation of trunk muscles with related VAF (Variability Account For) of over 95%. Trunk muscle synergy weightings and related time-varying coefficients are calculated for each kind of lifting techniques considering three synergies. Paired correlation coefficients between muscle synergies are all greater than 0.91 (P < 0.05) suggesting that trunk muscle synergies are similar for examined techniques in spite of their kinematic diversity. This similarity can be a result of their common ultimate goal. The acquired results also elucidate the mechanisms of muscle activation patterns that can be exploited in future studies and ergonomic interventions.

Squat

Motor Control

Torso

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Citations (2)

Assessment of the head, cervical spine, thoracic spine and shoulder girdle postures in people with and without chronic headache

International Journal of Therapy and Rehabilitation (2022)

Parisa Ahadi mandana rezaei Zahra Salahzadeh Mahnaz Talebi Parvin Sarbakhsh

Background/Aims Cervical dysfunction is one of the common symptoms of chronic headaches. This study was conducted to assess the posture of the head, cervical and thoracic spine and the shoulder girdle in people with and without cervicogenic and migraine headaches. Methods The postural angles of the head, cervical and thoracic spine and the shoulder girdle in frontal and sagittal planes, as well as thoracic spine curvature, were measured on 90 people who were split into three groups: 20 people with cervicogenic headache, 20 people with migraine and 50 people as the control group. Results There were significant differences among the three groups in the craniovertebral angle, coronal head tilt angle and scapular upward rotation angle (P<0.05). There was no relationship between postural angles. Conclusions The results of this study revealed that forward head posture was evident in people with cervicogenic and migraine headache. Decreased scapular upward rotation seen in the migraine headache group highlights the importance of shoulder girdle-related dysfunctions in people with chronic headaches.

Shoulder girdle

Cervicogenic headache

Forward head posture

10.12968/ijtr.2019.0140

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Citations (1)

Reliability of Voluntary Response Index Analysis Using Surface Electromyography in Professional Football Players

Middle East Journal of Rehabilitation and Health Studies (2024)

Ahmadreza Firouzi Mahmood Reza Azghani mandana rezaei Ali Jahan

Background: Surface electromyography (sEMG) represents a widely utilized technique in medical research. The voluntary response index (VRI) introduces a novel method for analyzing the motor control of voluntary movements via sEMG. This study aimed to assess the reliability of VRI and breakpoint angles (BPA) among professional football players during the Nordic Hamstring test (NHT). Methods: This study included 24 healthy professional football players. Through the use of sEMG, two aspects of VRI [magnitude (MAG) and similarity index (SI)] were evaluated during the NHT. Additionally, BPAs were determined by capturing slow-motion videos of functional tasks. The test-retest reliability across three trials was determined using the intra-class correlation coefficient (ICC). Results: The reliability of the VRI components during the NHT was found to be excellent. The ICC for MAG was 0.9 and 0.81 for the SI. Breakpoint angles exhibited moderate reliability (ICC = 0.65) during a functional task. The SI displayed a lower standard error of measurement (SEM = 0.07). The MAG’s SEM was 0.25, while BPA’s SEM was 17.8. Conclusions: The analysis of the VRI via sEMG showed nearly perfect reliability in professional football players during the NHT, a functional task. Breakpoint angles demonstrated significant reliability. The findings of this study indicate that both VRI and BPA are reliable methods for estimating motor control during dynamic movement tasks in professional athletes.

Football players

10.5812/mejrh-146098

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Objective Assessment of Spasticity by Pendulum Test: A Systematic Review on Methods of Implementation and Outcome Measures

Research Square (Research Square) (2020)

Fariborz Rahimi Reza Eyvazpour Nazila Salahshour Mahmood Reza Azghani

Abstract Background: Instrumented pendulum test is an objective and repeatable biomechanical method of assessment for spasticity. However, multitude of sensor technologies and plenty of suggested outcome measures, confuse those interested in implementing this method in practice. Lack of a standard agreement on the definition of outcome measures adds to this ambiguity. In this systematic review of studies, we aim to reduce the confusion by providing pros and cons of the available choices, and also by standardizing the definitions. Methods: A literature search was conducted for the period of 1950 to the end of 2019 on PubMed, Science Direct, Google Scholar and IEEE explore; with keywords of “pendulum test” and “Spasticity”. Results: Twenty-eight studies with instrumented pendulum test for assessment of spasticity met the inclusion criteria. All the suggested methods of implementation were compared and advantages and disadvantages were provided for each sensor technology. An exhaustive list categorized outcome measures in three groups of angle-based, angular velocity-based, and angular acceleration-based measures with all different names and definitions. Conclusions: From a critical point of view, sources of ambiguity were found and explained with the help of graphical representation of pendulum movement stages and corresponding parameters on the angular waveforms. We hope using the provided tables simplify the choices when implementing pendulum test for spasticity evaluation, improve the consistency when reporting the results, and disambiguate inconsistency in the literature.

Pendulum

Confusion

10.21203/rs.3.rs-27274/v1

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A computer model for evaluating the osteotomy parameters of Chiari pelvic osteotomy

International Orthopaedics (2009)

Mohsen Karami Dariush Gouran Savadkoohi Ali Ghadirpoor Sina Rahimpoor Mahmood Reza Azghani

10.1007/s00264-009-0769-2

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Citations (9)

The effect of saddle height and saddle position changes from pedal on muscles and joints behaviors in ergometer: A parametric study

Proceedings of the Institution of Mechanical Engineers Part H Journal of Engineering in Medicine (2018)

Elham Hazrati Mahmood Reza Azghani

The physical activities such as pedaling can affect the lower limb muscles strength and rehabilitation. Improper pedaling can cause injury. In this study, we would investigate the effects of saddle place (saddle position and saddle height) on the behavior of muscles and joints. Moreover, we would try to reveal the relationship between the muscles activity (Act) and the joints reaction forces ( F) and saddle position and saddle height. To this end, the pedaling conditions are obtained from the biomechanical model of the human movement system presented in AnyBody software. The variations in 12 muscles Act and total, normal and shear F of ankle, knee and hip joints are studied for the various saddle places in the pedaling feasible range. The relationships of those muscles Act and joints F are predicted by the response surface method. The results indicate that the muscles and the joints behavior changes for various saddle position and saddle height. The maximum and the minimum of the total response are acquired in the ankle and hip joints, respectively. In contrast to the ankle and hip joints, the knee shear response is greater than the normal response. The predictive models of the muscles Act and the joints F (the regression coefficients ( R 2 ) are 0.60–0.95 and 0.76–0.97, respectively) indicate their nonlinear behavior with saddle position and saddle height variations. Studying the muscles and joints behavior in different pedaling condition can be helpful for the suitable saddle placement in order for rehabilitation, muscles soreness reduction, and joints disorder treatment.

Saddle

Biomechanics

10.1177/0954411918809141

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Citations (5)

Influence of unstable footwear on lower leg muscle activity, volume change and subjective discomfort during prolonged standing

Applied Ergonomics (2015)

Zanyar Karimi Teimour Allahyari Mahmood Reza Azghani Hamid Reza Khalkhali

Barefoot

Leg muscle

10.1016/j.apergo.2015.09.003

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Citations (27)

Effect of Stability Training on Balance Recovery in Multiple Sclerosis Patients using Sample Entropy as a Nonlinear Analysis Method

Deleted Journal (2014)

سینا ساری اصلانی محمودرضا آذغانی بینا افتخارسادات Sina Sari Aslany Mahmood Reza Azghani

Introduction : Destroy of myelin in multiple sclerosis (MS) Patients, causes problems in the transmission of nerve impulses which result in some impairments in neuromuscular system, including patients balance disorders. As changes in complexity of a time series data represent latent information among them, measuring and analysis of body center of pressure during various activities is an efficient method to study the neuromuscular system and maintaining of balance. This would be possible with the help of Entropy measurement as useful method to study about complexity of the body kinematics. Methods and materials : Center of Pressure (COP) fluctuations signals were recorded from 20 MS patients before and after 24 sessions of balance exercises and then analyzed them with two methods of Entropy Measuring. Results : Results of both methods showed a significant increase in Entropy Measure of patients COP fluctuations after 12 weeks of exercises. Increasing entropy of COP’s fluctuations in frontal plane were more than sagittal ones. It was identifiable in both methods. Conclusion : Increasing the amount of entropy measure indicated beneficial influence of exercises on recovery of balance system in MS patients. So these kinds of exercises could be used as an efficiently clinical Intervention for MS Patients. Key Words: Sample Entropy, Multiple Sclerosis, Balance Exercises, Locus of Body Center of Pressure

Sample entropy

Balance disorders

Approximate entropy

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Evaluating the Fatigue Rate of Lower Leg Muscles during Prolonged Standing: A Comparison between Stable and Unstable Footwear

DOAJ (DOAJ: Directory of Open Access Journals) (2017)

Zanyar Karimi Mahmood Reza Azghani Teimour Allahyari Hamid Reza Khalkhali

It is well established that unstable footwear with a rounded sole design has the potential to alter lower limb muscle activity during standing and walking activities. Thus, the main objective of this study was to compare lower leg muscles fatigue rates between stable and also unstable footwear during prolonged standing. This study was conducted in Urmia, northwest Iran (2015) and participants included ten young healthy male. During 2 h of continuous standing with two footwear conditions (stable and unstable shoes), surface electromyographic (EMG) data of bilateral tibialis anterior (TA) and medial gastrocnemius (MG) muscles were continuously recorded. The probability of muscle fatigue was identified through recording simultaneous increase in the EMG amplitude and shift in the EMG frequency spectrum towards lower frequencies. According to analysis of EMG recordings, standing with stable shoe yielded significantly higher rates of muscle fatigue for bilateral MG muscles (p < 0.05). Furthermore, no significant differences were observed for the fatigue rates of TA muscles between two footwear conditions. However, none of monitored muscles were indicated fatigue during standing with unstable shoe. The results suggested that unstable footwear, compared to stable one, is more efficient to prevent the occurrence of muscle fatigue which seems to be advantageous for the musculoskeletal system. Therefore, unstable footwear can be recruited as an ergonomic intervention for individuals who stand for prolonged periods.

Muscle Fatigue

Leg muscle

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Lower leg swelling and muscle co-contraction during prolonged standing: an unstable footwear evaluation

Footwear Science (2017)

Zanyar Karimi Mahmood Reza Azghani Teimour Allahyari

The purpose of this study was to investigate the lower leg swelling and muscle co-contraction during prolonged standing with the focus on unstable footwear effects. The EMG signals of medial gastrocnemius and tibialis anterior muscles (bilaterally) were continuously recorded to quantify their co-contraction index (CCI) in 10 healthy asymptomatic subjects during two hours of standing in three footwear conditions including barefoot, stable shoe and unstable shoe. Lower leg circumference changes (swelling) were also monitored over the standing time. During two hours of standing remarkable reduction in lower leg circumference changes and significant reduced CCI level for both legs were observed only for unstable shoe compared to barefoot condition. However, bilaterally, no significant differences were found for both measures between barefoot condition and stable shoe or between two shoe conditions (stable and unstable). The unstable shoe produced changes in activity pattern of lower leg muscles which seems to be advantageous for venous pump mechanism during prolonged standing. These findings suggest that unstable footwear can be used as ergonomic intervention for prolonged standing during work or daily activities.

Barefoot

Leg muscle

10.1080/19424280.2017.1342702

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Citations (5)