Nurhidayah Omar
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Preferred name
Nurhidayah Omar
Official Name
Nurhidayah, Omar
Alternative Name
Omar, Nurhidayah
Omar, N.
Main Affiliation
Scopus Author ID
55868013900
Researcher ID
DJC-5796-2022

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Accelerometer-based physical fatigue assessment in 400 meter running event

2021-05-03 , Atiya S.O. , Ahmad Faizal Salleh , Norasmadi Abdul Rahim , Mohammad Shahril Salim , Saidatul A. , Nurhidayah Omar , Hamzah S.

Monitoring physical fatigue and capacity is important in high-performance environments to optimize the training stimulus and minimize unplanned physical fatigue. For that purpose, accelerometer sensors have emerged as a tool with the potential to measure and reflect changes in runner's acceleration. An accelerometer was used to measure the acceleration patterns which provided an analogue signal that could analyzed further by using different feature extractions. This research was aimed to estimate the location of physical fatigue occurrence in 400 m running. Basically, the experiments were conducted in outdoor track field, 6 subjects were involved, with age ranging between 19-24 years. In this study, two features have been used which are root mean square (RMS) and player load (PL) to indicate fatigue. The obtained results have shown that there were declines in the player load values in the last 150 m of running for most of the subjects which indicate occurrence of physical fatigue. On the other hand, some subjects have tried to save their energy in the 2nd and 3rd 100 m to speed up again in the last 100 m but there were obvious decrements in their player load in 400 m compared to the 1 100 m of running.

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Which Joint Angle Changes Have Most Influence on Dart Release Speed?

2020-01-01 , Nurhidayah Omar , Abdul Nasir, Farah Syahida , Ahmad Faizal Salleh

A three-segment angle-driven model of dart throwing was developed to observe which joint angle of the upper limbs has most influence on the dart release speed. A subject performing 10 dart throwing trials were recorded using a motion analysis system. Subsequently, the joint angle time histories of individual trial were put in into the simulation model. The model calculated resultant dart release speed for each recorded trial and each trial was matched accurately. Systematically substituting a constant value to each joint angle, and observing the changes on dart release speed indicated that dart release speed was most susceptible to forearm extension/flexion. During coaching or performance, attention should be focused on this joint angle because any changes could have a substantial effect on the dart release speed.

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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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Biomechanical and ergonomics study of manual material handling during team lifting activity

2023-02-21 , Latib N.L.M. , Mohammad Shahril Salim , Shahriman Abu Bakar , Ahmad Faizal Salleh , Nurhidayah Omar , Hamzah Abdul Hamid , Saidatul Ardeenawatie Awang , Kamaruddin A.

This project focused only on the joint contribution and ground reaction force that took place during the team lifting activity made up of two people. This present study hypothesized that the workplace variables such as the weight of loads, the height of load to be lifted and gender would affect the kinetics and kinematics variables. Eight healthy participants (BMI: 18.5 till 24.9 kg/m2) divided into four team where there are two groups of male and two groups of females with two individuals in each team have performed asymmetric lifting task under four different conditions which are two weights of loads (5 kg and 15 kg) and two level of lifting heights (participant knuckle and elbow height from ground). There are five Oqus cameras motion capture system (Pro Reflex infrared, Qualysis) to capture the participant motion, Qualisys Track Manager (QTM) software had been used to label the markers on participant body while the force plate had been used for data collection of ground reaction force throughout the lifting activities. The data collected from QTM converted into C3D file to be used in Visual 3D software to do bone modelling and analysis on ground reaction force, joint angle and joint moment. The results show that here was a statistically significant interaction between the effect on gender and load on joint angle, p=0.001 for hip. However, there is no statistically significant interaction between gender and load on right and left knee angle. Besides the two-way ANOVA was conducted that examine the effect of gender and load on joint moment. Thus, there is a statistically significant interaction between the effect on gender and load on joint angle, p=0.001 for all joint moment at both elbow and knuckle height. In term of ground reaction force, there was a statistically significant interaction effect between gender and load on the combined dependent variable during to-lift phase at in lifting phase position at elbow height and knuckle height, p=0.001 when using two-way MANOVA. Based on the results of this study, it was concluded that hip joint angle, hip and knee joint moment affected by gender and load while for ground reaction force are influenced by the variables of lifting height, lifting stage, gender and weight of loads.

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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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Differences on kinematic, kinetic and muscle activities between MSD and health groups for different body movements: A literature review

2023-02-21 , Isa M.S.M. , Nurhidayah Omar , Ahmad Faizal Salleh , Mohammad Shahril Salim

The aim of this study is to review the differences on kinematic, kinetic and muscle activity parameters between the musculoskeletal disorder (MSD) group and the healthy group in everyday activities. This paper outlines the existing evidence on the differences of the kinematic, kinetic and muscle activities between participants with MSD and healthy participants during several activities. The search included Google-Scholar, Scopus, Elsevier-Science Direct and IEEE Explore, which next were separated into three categories: kinematic, kinetic and muscle activity parameters. Studies that compared movements between individuals with MSD and healthy participants were included. From the search results, we identified a total of 335 articles, 134 articles were selected. However, as this study focused only on participants with MSD, 113 articles were eliminated because those articles included participants who had injuries or diseases. Thus, the articles with non-MSD related were excluded which resulted with only 21 articles for final review. Based on the review, there were differences between MSD group and healthy group on kinematic, kinetic and muscle activity parameters. The MSD group had significantly greater hip and knee joint angles during walking and the average of all muscles in MSD group was higher than the healthy group.

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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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Dynamic modelling of the spine for the estimation of vertebral joint torques using Gordon’s method

2025-01 , Munawwarah Solihah Muhammad Isa , Nurhidayah Omar , Saidatul Ardeenawatie Awang , Mohammad Shahril Salim , Suhizaz Sudin

World Health Organization (WHO) recognised musculoskeletal disorder (MSD) as the main contributor to disability worldwide, with low back pain as the major disorder globally. The occupational disorder normally occurs during lifting. The weight of the load and manual handling tasks during lifting has an impact on the spine and joint torque. The purpose of this study is to propose a dynamic model of the spine that can estimate the vertebral joint torques. This study is a bimodal approach that consists of the experimental and theoretical parts. Ten healthy UniMAP students (10 males) participated in this study. The subjects were required to lift a 3kg weight plate for kinematics and EMG data collection. Retro-reflective markers were attached to the subject body, and then, the data was collected and stored in QTM software. Kinematic data was processed using C-Motion Visual3D. Eight Trigno Wireless Sensors were attached on the back muscles (left and right erector spinae, latissimus dorsi, external oblique and internal oblique). The EMG data were stored in EMG Acquisition software and subsequently, were processed using EMG Analysis software. Gordon’s method was used to develop a mathematical model of the spine. The model comprises of five kinematic chains which connected three lumbar, two thoracic and one cervical. The model calculated the value of joint torque on flexion/extension movement using Matlab and Microsoft Excel. When calculated on L5, the model gives an estimation within 0 – 30 kgm2s-2. The model was further used to estimate value of L3, L1, MAI and T2. The estimate average value of joint torque at L3 is within 5 – 25 kgm2s-2, MAI is within 0 – 6 kgm2s-2 and T2 is within 0 – 1 kgm2s-2. The average RMS values show the highest muscle activity on the right internal oblique muscle (1519 µV), followed by the right external oblique (1166 µV) and left external oblique (418 µV). The results obtained gives an insight on the value of joint torque that have been applied by the spine and the most activated back muscles during lifting.

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