Mohammad Shahril Salim
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Preferred name
Mohammad Shahril Salim
Official Name
Mohammad Shahril , Salim
Alternative Name
Salim, Mohamad Shahril
Salim, M. S.
Main Affiliation
Scopus Author ID
37108376700
Researcher ID
AAR-1750-2020

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The Influence of Saracen Archery Grasping Techniques and Forearm Muscles Activation on Shooting Performance in Traditional Archery: A Pilot Study

2021-11-25 , Kamarudin N.F. , Ahmad Faizal Salleh , Mohammad Shahril Salim , Kasim M.F. , Nurhidayah Omar , Maz Jamilah Masnan , Lim C.C.

The purpose of this study is to understand the influence of four grasping techniques recommended by Saracen Archery and associated forearm muscles activation on traditional archer’s shooting performance. Each archer has shot 6 arrows in each grasping technique to the target, EMG activities of muscle Flexor Digitorum Superficialis (MFDS) and muscle Extensor Digitorum (MED) were collected in bow arm during aiming phase. The shooting performance was indicated by the distance from arrow hitting point on the target to the bull’s eye. The results revealed that each subject has specific grasping technique to obtain the best shooting performance. The grasping technique that generated the best performance is not as recommended by Saracen Archery. All subjects indicated that the best shooting performance was obtained when MED activated more than MFDS.

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Effect of Strength and Conditioning Trainings on Lower Limb Muscles Activity of High-Jumping Athletes

2021-01-01 , Hamiza Mohamad Radzi , Ahmad Faizal Salleh , Norasmadi Abdul Rahim , Mohammad Shahril Salim , Nurhidayah Omar , Hamzah Sakeran , Nair S.K.

In recent years, there has been a proliferation of technology and sport science utilized within an athlete’s physical activity and exercise. This study aims to assess the effectiveness of two strength and conditioning exercises, namely, a customized free-weight exercise and plate-loaded machine exercise, on the lower limb muscle activities of the amateur high jumpers. Six amateur high jumpers were divided into two groups, a customized free-weight group and plate-loaded machine group (control group) and performed exercises as instructed by the coach. The EMG signal of the Rectus Femoris and Bicep Femoris muscles were recorded during the exercises. Metronome was used to control the speed of the exercise and it was standardized for all subjects. The harmstring’s cable pull exercise (customized free-weight) triggered Bicep Femoris more compared to the leg curl exercise (plate-loaded exercise). Similarly, in the case of Rectus Femoris muscle, the front squat exercise (customized free-weight exercise) triggered higher muscular activities compared to the leg extension exercise (plate-loaded exercise). In conclusion, the customized free-weight exercise has indicated higher muscle activities compared to the plate-loaded exercise.

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Analysis of crack propagation in human long bone by using finite element modeling

2017-12-04 , Mohammad Shahril Salim , Ahmad Faizal Salleh , Ruslizam Daud

The aim of this research is to present a numerical modeling of crack for human long bone specifically on femur shaft bone under mode I loading condition. Two - dimensional model (2D) of long bone was developed based on past research study. The finite element analysis and construction of the model are done using Mechanical APDL (ANSYS) v14.0 software. The research was conducted mainly based on two conditions that were at different crack lengths and different loading forces for male and female. In order to evaluate the stress intensity factor (KI) of the femur shaft of long bone, this research employed finite element method to predict the brittle fracture loading by using three-point bending test. The result of numerical test found that the crack was formed when the crack length reached 0.0022 m where KI values are proportional with the crack's length. Also, various loading forces in range of 400 N to 1000 N were applied in an attempt to study their effect on stress intensity factor and it was found that the female dimension has higher KI values compared to male. It was also observed that K values found by this method have good agreement with theoretical results based on previous research.

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Variation of Stress Intensity Factor and Strain Energy Release Rate in Human Cortical Bone Using Finite Element Analysis

2021-01-01 , Mohammad Shahril Salim , Nur Azila Azahari , Ahmad Faizal Salleh , Ruslizam Daud , Hamzah Sakeran

Finite element analysis is an alternative way to study human fracture behaviour as the technology is a leading innovation in biomechanics field. The aim of this study is to analyse the strain intensity factor and strain energyrelease rate when three-point bending test and tensile test were applied on a two-dimensional cortical bone model developed and tested using finite element software, Ansys. K values gained from Data Extrapolation Method (DEM) through Ansys for three-point bending test were compared with CINT method, Hiroshi Tada’s and Allan F. Bower’s theoretical expression while K values from DEM were only been compared with CINT method for tensile test. Meanwhile, J-integral values were obtained through CINT method using Ansys and analysed with different crack-to-width ratios and loads. As a result, stress intensity factor increased as crack-to-width ratio increased and strain energy release rate also increased as crack-to-width ratio and loads increased. It can be concluded that finite element analysis can be used to study the fracture behaviour of human cortical bone.

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Changes on EEG Power Spectrum with Carbohydrate Mouth Rinsing

2023-01-01 , Kamaruddin H.K. , Bakar A.H.A. , Zainuddin N.F. , Mohammad Shahril Salim , Saidatul Ardeenawatie Awang

Carbohydrate (CHO) mouth rinse has been shown to activated brain regions via oral receptors that related to rewards and motor control that can enhance exercise performance. The objective of this study was to examine the effect of CHO mouth rinsing on electroencephalography (EEG) power spectrum responses. Ten recreational athletes performed a mouth rinsing for 10 s with CHO or placebo (PLB) solution on seated position, eyes closed and in air conditioning room. The EEG was measured during the initial mouth rinsing with 14 electrodes attached on the participant’s scalp. The EEG activity included alpha, beta, delta, and theta power increased following mouth rinsing (CHO and PLB). However, a significant alpha power was observed with CHO when compared to PLB mouth rinsing on frontal and temporal regions (p = 0.003). No significant differences within beta, delta, and theta power for both solution comparisons, respectively (p > 0.05). The results of this study demonstrate that brain activity may be related to the presence of CHO mouth rinsing. The changes in cortical responses particularly in alpha power may influence the increased of arousal and motivation level.

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Effect between cadence and lower extremity muscle activity during uphill cycling to cyclist performance

2020 , Yvonne Koay Ee Vorn , Ahmad Faizal Salleh , U.N.N. Abdullah , Mohammad Shahril Salim , Hamzah Sakeran

Cycling is an exercise performing in a vertically reciprocating movement using bicycle which usually serves as sport equipment for training and as transport. Great quantity of lower extremity muscle contraction involved in uphill cycling. In the past few decades, research related to cycling includes study of lower limb muscle activity by various situation applied. However, few research studies on the lower limb muscle activation level with varying cadence during uphill cycling. Thus, this task proposes to investigate the effect of pedalling cadence and tilting angle of cycling on lower extremity muscle activity, and to compare the muscle activation level between genders. Three pedalling cadences (70rpm, 80rpm and 90rpm) and two tilting angles of cycling inclination (10° and 30°) were set. Electromyography (EMG) measurements of the vastus lateralis and vastus medialis in quadriceps were done and collected from 5 males and 5 females during cycling. ANOVA analysis was performed, and results indicated that pedaling cadence had significant influence on the lower extremity muscle activity (p < 0.05). Increasing pedaling cadence caused a significant increase in the muscle activation of the vastus lateralis. For gender effect, females tend to have a higher muscle activation level and significantly greater vastus lateralis muscle activity than males during cycling. On the other hand, no significant differences in peak muscle activity at both tilting angles of cycling and no significant interaction effect in all group comparison.

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Statistical analysis of postural stability during gait for adults between normal and simulated abnormal gaits

2023 , Xing Hui Wong , Hamzah Sakeran , Mohammad Shahril Salim , Wan Zuki Azman Wan Muhamad , Ahmad Faizal Salleh , Mohamad Azlan Mohamed Shapie

Walking is a common but complex daily activity for human. Walking is done when one leg is elevated and moved forward by flexing the hips and knee. Walking involves association of central nervous system, motor and sensory system. It has been previously shown that disrupted neural communication and musculoskeletal constraints may impair postural control and stability during gait and increase fall risk. Previous research have reported that distance between centre of pressure (COP) and centre of mass (COM) are suitable to study postural stability of patients that is affected by HSP disease. There is no research studied about normal and four types of simulated abnormal gaits which include hemiplegic, diplegic, bilaterally asymmetry and hunchback by analysing COP and COM. Fifteen male subjects and fifteen female subjects were involved in this research. Performances of subjects were captured with QTM system and analysed by Visual 3D software. For females, there was a significant difference in normal and hemiplegic gait in AP direction. For males, normal, hemiplegic and bilaterally asymmetry showed significant differences in AP direction while normal and diplegic demonstrated significant difference in ML direction. This finding concluded that COP-COM method can be suggested for clinical research and rehabilitation purpose.

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Influence of Carrying Unstable Load on Thoracic Kinematics While Walking on a Curved Path

2021-11-25 , Ngoc D.K. , Ahmad Faizal Salleh , Mohammad Shahril Salim , Nurhidayah Omar , Basarrudin K.S. , Hamzah Sakeran , Halim I. , Usman J. , Lim C.C.

This study investigated the effect of carrying unstable load on thoracic kinematics while walking on a curved path. Three-dimensional spinal kinematics were defined as the rotations between thoracic and the Virtual laboratory coordinate system (Tho/ Virtual lab) which consisted of lateral bending (LB), flexion/extension (FE) and axial rotation (AR) in the frontal plane, sagittal plane and transverse plane, respectively. Eight healthy young adults (4 males and 4 females) performed loads carrying and walking on one meter radius curved path. Spinal kinematics was determined at the left leg heel strike and just before the right toe off during the curved path walking. As a result, a significant main effect of load intensity was found only on FE of (Tho/Virtual lab) at both left leg heel strike and right leg toe off. The study concluded that an increase in the load intensity of unstable load from 10% of body weight likely to generate more thorax extension.

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The Influence of Grasping Technique and Arm Posture on Shooting Performance in Traditional Archery

2021-01-01 , Fitriyani N. , Ahmad Faizal Salleh , Mohammad Shahril Salim , Kasim M.F. , Nurhidayah Omar , Maz Jamilah Masnan , Ghazali Z.

Traditional archery is becoming popular and has attracted many people at different age level to acquire skills and finally participate in competitive games. It differs from modern recurve archery where it could not rely on equipment for accuracy and stability. It depends on the skilled developed by the archer and adaptability to the environment for competition. Technique of archery shooting was written in many books and may require investigation to confirm their effect on performance of an archer. Therefore, this study aims to investigate the effect of arm posture and bow’s grasping techniques on the traditional archer’s shooting performance (higher score and minimal distance from bulls eye to the location where the arrow hits the target). Four experienced archers performed 5 m indoor shooting and their movement was recorded using motion capture system. The Square grasping technique resulted in more higher scores and minimal distance as compared to the other technique. Overall, the arm posture angle, Φ, did not influenced the shooting performance, except for the Oblique grasping technique.

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Splining raw kinematic data of standing-bending-lifting movement

2024-01-05 , Nurhidayah Omar , Isa M.S.M. , Ahmad Faizal Salleh , Mohammad Shahril Salim

Spline functions and digital filtering are two numerical methods normally used by the researchers in the field of biomechanics to perform data smoothing and time differentiation. The objective of this study is to perform data smoothing on the raw kinematic data of a subject performing standing-bending-lifting activity using spline function, and to calculate time differentiation from the kinematic data. Raw data on standing-bending-lifting movement was recorded in Biomechanics Lab, UniMAP. Next, quintic spline function was used to smooth the data and calculate the angular velocity and angular acceleration at L5, L3, L1, MAI and T2. When calculated for one trial, the error estimation between smooth and raw data at L5, L3, L1, MAI, and T2 are 0.008°, 0.003°, 0.003°, 0.004°, and 0.008°, respectively. When calculating for five trials, the average error estimation between smooth and raw data at L5, L3, L1, MAI, and T2 are 0.007°, 0.009°, 0.011°, 0.012°, and 0.012°, respectively. The result shows that the quintic spline is able to produce satisfactory output in data smoothing.

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