In developing ergonomically sound furniture, there is a need in evaluating anthropometrics from various aspect such as gender differences. The objectives of this study was to evaluate anthropometrics differences between genders of children in Malaysia in order to determine the need in having specified chairs for each gender. Represented by four states in Malaysia, a total of 2400 children were involved in the study. A custom made measurer and an anthropometer were used to measure the subjects. Six body measurements, which are, sitting shoulder height, sitting subscapular height, shoulder breadth, buttock popliteal length, popliteal height and hip width were documented for evaluation. From this study, there were some significant differences on some body parts while other body parts were similar to male and female. Therefore, chairs are needed to be made according to the suitability of both gender.
The objectives of this study are to investigate diagnostic value of two different tests amongst tests highly
recommended and used for diagnosis of HAVS of the sensorineural component; Semmes Weinstein Monofilament
(SWM) and Purdue Pegboard (PP) tests using vibrotactile perception threshold (VPT) test as standard objective
quantitative test. For the method, a total of 176 grinders as vibration exposed respondent of a shipyard’s
fabrication participated in this study. Questionnaire and vibration exposures data were collected for all respondents
where 67 respondents further performed the three quantitative sensorineural testing. The result showed that mean
acceleration magnitude of grinding tools used were 4.9 ms-2, exceeding recommendation by European Commission.
Both cut-off point methods of mean plus two times standard deviation (mean + 2sd) and z-score (at 75th percentile)
show significant difference among healthy and HAVS (p < 0.001). Correlation between SWM with VPT and PP with VPT
was weak. However, results suggests progressive pathological damage to sensorineural component of the digits starts
with fast-adapting II (FA II) mechanoreceptors indicated with significant correlation primarily at 125 Hz. Analyses of
sensitivity and specificity found that monofilament at 0.16g force best discriminate HAVS from healthy. In the other
hand, Purdue Pegboard test shows best diagnostic value of indicating HAVS at minimum insert of 16 pin and 14 pin
respectively for dominant and non-dominant hand. Both Semmes Weinstein Monofilament and Purdue Pegboard tests
has limited diagnostic value to be used as screening tools for early detection of HAVS.
Motorcyclists are particularly vulnerable when compared to large vehicles on the road. This study was conducted to gather feedbacks from motorcycle deliveryman regarding their riding conditions. A self-rated questionnaire was used to determine prevalence of riding symptom and its association with Whole Body Vibration and other associated factors among motorcycle deliveryman in Malaysia. A set of questionnaire was developed, pilot tested for its reliability and validity and distributed to 100 respondents. An interview was conducted after gathering the data from the respondents through the questionnaire. Survey findings show majority of the respondents preferred to ride according to the standard riding posture. Large majority of them agreed handlebar and foot peg/rest exposed them directly to the vibration. In addition, majority of them felt discomfort at the lower back and felt fatigue after long hours of riding. These findings are in-line with past studies regarding the road users.
Ergonomic is important in classroom. Sitting for protracted period in class may lead students to develop musculoskeletal disorders. Their physical health and performance in the class may increase by designing school furniture that match with human body. In Malaysia, there is a lack of ergonomic assessment for school environment especially in urban areas. The aim of this study is to determine the mismatch between the furniture dimension and anthropometric parameters among primary school children in Putrajaya. This is a cross-sectional study which involved 100, Year 1 and Year 6 primary school students randomly selected in Putrajaya. Five anthropometric measurements (popliteal height, buttock popliteal length, elbow height, shoulder height (sitting), hip breadth) as well as five furniture dimensions (seat height, seat depth, seat width, backrest height and seat to desk height) were measured. Instrument used is Martin type anthropometer set, SECA body meter, and SECA weighing scale. Calculation for determining mismatch between the furniture and anthropometric measures were calculated using a standard mismatch formula. There was 100% mismatch for seat height, seat depth, and seat to seat to desk height for Year 1. As for Year 6, mismatch was reported 100% for backrest height and seat to desk height. There were significance difference for parameters of popliteal height between Year 1 and Year 6 and between male and female of Year 1. There was a presence of mismatch between furniture dimension and children anthropometric measurement. Proposed dimension of furniture shows decrease in percentage of mismatch for the most parameter of anthropometric measurement.
Mobile phone distraction is a global issue in road safety perspective especially involving the pedestrians. A lot of
research findings had suggested that the use of mobile phone increase the risk for pedestrians while crossing the
road, but there have been very few studies that could explain the said threat in Malaysia’s situation. This study aims
to identify the distracted pedestrian behaviour via the video recording method. More than 300 samples were
observed as involved in mobile phone distractions while crossing the roads from a total of approximately 1,500
analysed samples. The study also found that the highest mode of distraction observed among pedestrians was the
“handheld usage” (conversing) as compared to the “hands-free” and “application usage” modes. In addition, the
distractions had significantly affected the time to cross and the observed road users who were involved in
“application usage” took longer time to cross. These results provide a prevalence material that may be useful in the
development of countermeasures.
Manual workers in plastics industry are often exposed to work related discomfort and pain while performing their daily
task. These exposure leads to common occupational diseases such as Work-related Musculoskeletal Disorder (WMSD) or
low back pain (LBP) which in turn will affect their working performance. The main objective for this study is to
analyse the working posture of a manual worker that works in a polypropylene fibrillated yarn industry using RULA
assessment in CATIA P3 V5R14 software. The subject were selected from the packaging area as the manual handling
work are only present in that area. Based on the RULA analysis done by constructing the worker posture in the
software, several awkward postures were identified to be high in risk factors. The postures that is high in risk is
postures 3 which is due to lifting heavy loads and twisting or turning of the trunk. The postures obtained the final
RULA analysis score of 7 and this indicates that changes must be done immediately. It is recommended that the
company should increase the ergonomic awareness among the manual workers especially while performing their work
and to redesign the working posture for the manual workers.
This paper presents the methodologies and the systematic approaches in the industrial design development process
to incorporate aesthetic and affective elements in a Glucose Sensor device. EQUID (Ergonomics Quality in Design)
design approach was applied where users’ requirements were identified in early design stage utilizing Kawakita Jiro
(KJ) method. Benchmarking and trend analysis were also conducted in early stage to understand market trends,
compare features and faults in existing product in the market, at the same time finding opportunities for
improvement in our own product. The development of the shape of the Glucose Sensor device, the color chosen and
the branding profile creation were also discussed in the paper. Several design concepts and prototypes have been
developed and user’s emotions towards each concept in focus group have been captured. The survey was carried out
at the end of this paper to assess the design effectiveness.
Repetitive Strain Injury (RSI) is the most common occupational injury faced by computer users. Computer users faced
higher possibility of getting RSI due to their prolonged working time and static posture. The three main objectives of
this study are, first: to identify the prevalence of RSI among computer users; second, to investigate and determine the
RSI risk factors; and third to analyze the association between RSI risk factors and the prevalence of RSI among computer
users at a Telecommunication Company X. A total of 100 respondents were selected based on their daily exposure to
computer usage of more than 4 hours. Nordic modified questionnaire was used to gather respondents’ sociodemographic
data, job’s information, physical risk exposure, physical symptoms and their awareness level towards RSI.
Body Parts Symptoms Survey (BPSS) form were also used to identify the body parts exposed to the RSI risk among
computer users. The data was analysed using Statistic Package for Social Science (SPSS) version 22. Study results showed
that the 41% of computer users in Telecommunication Company X felt tired at the upper-back near the neck and 38%
at the shoulder region. In conclusion, the prevalence of RSI among computer users is high at upper back near the neck
and at the shoulder region. There is a significant association between risk factors of RSI and the prevalence of RSI
among the computer users at Telecommunication Company X.
Agricultural activities have always been associated with hazards and injuries. Most common injuries experienced by workers are health, safety and ergonomic injuries. It stems from many causes, such as the use of manual tools, incorrect working position, inadequate rest and overloading. This paper aims to reveal the daily hazardous work task of oil palm plantation workers with highlighting the ergonomics problems and risk of injury they faced. Observations of work tasks and distribution of Modified Nordic Questionnaire (MNQ) were performed for every work unit. Worker’s activities and posture while performing work tasks were recorded extensively using camera and video recordings for ergonomics analysis. Results from the observation and questionnaire survey conducted, showed that oil palm plantation workers are exposed to the risk of dangerous work every day. Fresh fruit bunches cutter and loose fruit collectors were having highest body pain complaints and almost from them are having low back pain problems. Therefore, it is necessary for an immediate action from the management in order to determine the current prevalence of ergonomic injuries. Using of manual tools should be avoided and plantation workers should be provided with ergonomics machines that can help them reduce their workload and injuries.
Validity test is important during the development of ergonomics measurement. Failure to conduct validity tests will result in the measurement method being developed to be incapable of providing reliable ergonomics measurements. The objective of this study is to conduct validity test on the simple method ergonomics measurement which was developed. The method named Simple Ergonomics Risks Assessment (SERA). Content validity test and criterion validity test were conducted. The content validity test consists of 6 ergonomics experts who actively provide inputs and positive feedbacks to improve the measurement method being developed. Meanwhile, the criterion validity test involves data collection of complaints on body parts among oil palm workers which were derived from Nordic Musculoskeletal Questionnaire (NMQ) and ergonomics risk assessment scores obtained from SERA. Both findings were tested with the Chi-square test to explore possible relations between the two findings. Results from the test conducted showed that there are significant relations in the scores of neck posture; hip, right and left shoulder, right and left wrists and the right hand associated with fresh fruit bunch (FFB) harvesting activities. In the loose fruits collection, the Chi-square test showed significant relations in the scores of neck posture, hip, right and left shoulders, right wrist, right arm and the left hand. However, there are body parts such as the legs which showed no significant relation. More tests should be conducted to further explore the validity of the method being developed. Findings from both validity tests show that SERA were verified by the experts and tested with validated method so that it is valid to be applied in the future.
Fatigue due to driving is an important aspect in maintaining drivers’ performance and safety. There are many studies linking fatigue to reduction in performance and increase in accident risk. There are also some signs linking road and vehicle vibrations to fatigue, but this not been thoroughly investigated. Experiments have been made to detect and quantify levels of driving fatigue in human, usually involving driving over long distance of highway or normal roads. However, these methods are quite time consuming, high cost, hard to control and also potentially high risk. With the development of better display, computing power and motion technologies, driving simulators are becoming more and more realistic each year. With this insight, it is proposed that these driving simulators can be used as a tool to study human fatigue, where they can counter the above shortcomings significantly. This paper will review different methods conducted in past published works to investigate the viability and validity of using driving simulators as a tool for studying vibration matters and its effects on human fatigue. In this paper, there were twenty past studies have been reviewed in term of its simulator design and its study design. The selection is based on these keywords; simulator, fatigue, vibration, human and driver and all papers were filtered from 1990s to current year.
Most studies have examined the association of ergonomic risk factors and musculoskeletal discomfort in developed countries. Meanwhile the data are still lacking in developing countries such as Malaysia. The aim of this study was to determine the relation between risk factors and musculoskeletal discomfort among manual material handling workers in Malaysian automotive industries. A total of211 manual material handling workers from automotive industries completed a set of questionnaire on the individual, physical and environmental factors and the prevalence of musculoskeletal discomfort. The Chi-Square test and logistics regression analysis were used to determine the relationship of the risk factors and musculoskeletal. The findings highlighted that job tenure was significantly correlated with musculoskeletal discomfort among the workers (OR=2.33-5.56). The most significant physical risk factor that was associated with musculoskeletal discomfort was bending the trunk forward slightly, hands above knee level, which was significantly related to lower back discomfort (OR=5.13, 95%CI=1.56-16.8), thigh discomfort (OR=5.1, 95%CI=1.01-25.53) and wrist discomfort (OR=3.65, 95%CI=1.06-12.53). Twisting of the trunk (over 45o) and bending sideways were significantly associated to lower back discomfort (OR=4.04, 95%CI=1.44-14.44), and thigh discomfort (OR=4.3, 95%CI=1.29-8.50). The findings also highlighted that environmental factors was associated with musculoskeletal discomfort (p < 0.05. Musculoskeletal discomfort can be reduced by lowering work-related risk factors among automotive manual material handling workers, particularly by focusing on significant factors, including job tenure, bending or twisting postures and environmental factors.
It was suggested by most researchers that train drivers’ workload and alertness levels attribute to train accidents. The main objective of this study is to determine the significant patterns of mental workload and alertness levels of train drivers with respect to the conditions. The data are collected from simulation experiments on 15 professional train drivers. The simulation experiments are performed under three driving conditions (i.e. daytime, rainy daytime and rainy night) using a train driving simulator set. Electroencephalogram (EEG) signals are collected from six significant points on the body of the subjects. It is found that the mental workload of the train drivers tends to be high during rainy night driving condition and sleepiness occurs which is indicative of low vigilance. The beta amplitude increases under rainy night driving condition which may be attributed to viewing difficulties while driving in the dark. The results reveal that there is a significant different between each session (p = 0.042) especially with the pattern for rainy night driving. It is also observed that there is lower mental workload among the train drivers, which indicates that the train drivers are detached from their work.
Seating comfort is one of the important indicators while driving especially for a long hour drive. The objective of this study was to execute a preliminary study of survey and identify the discomfort of body while driving and after driving session by conducting a survey. The questionnaire developed was tested for its reliability. By using Cronbach’s Alpha, this paper’s contribution was found to be significant in which it provides a survey with acceptable test reliability in which the alpha (α) was 0.887. The survey was conducted on 30 students of University Malaysia Pahang (20 male and 10 female) with driving experience and valid driving license. The subjects should have experiences in driving small size car or mini car as well. The results showed that the body area that the drivers felt discomfort while driving and after driving should be known. The findings showed that the discomfort was intense at the neck, upper back, and lumbar while and after driving.
Proper driving requires a proper posture to bring comfort to drivers. A problem that commonly exists in driving is incorrect driving posture which can cause discomfort to the driver, especially when interacting with automotive pedals. Research on contraction of tibialis anterior (TA) muscle on driver's posture based on the knee angle less than 101º in a position of pressing and releasing a pedal was conducted to investigate and overcome this problem. This is a field experiment study and surface electromyography (sEMG) is used in collecting data on the TA muscle. The procedure of collecting data on the TA muscle before and after experiments follows the Surface ElectroMyoGraphy for the Non-Invasive Assessment of Muscles (SENIAM) recommendations. The result of the experiment shows that there is a strong negative relationship between driver's postures in nature based on the angle of the knee with TA muscle contractions, where the Pearson correlation coefficient (r) is - .993. While the temporal analysis measurements based on Maximum Voluntary Isometric Contraction (MVIC) 60% in a position of releasing a pedal exceeding rms μV 39.38, are 39.71 and 40.25 respectively. On the other hand, MVIC 2% rms μV values: 1.19 and 1.2 are obtained in the position of pressing the pedal. The knee angle with TA muscle contractions is significant [F (1, 10) = 660, p
Brain Computer Interfaces (BCI) provide a vast possibility in enabling the brain to communicate directly with the computer, hence providing an alternative in controlling the machines without much effort. In fields of rehabilitations robotics, the applications of an exoskeletons in assisting a spinal cord injured (SCI) patients were growing. Steady state visually evoked potentials (SSVEP) based BCIs that utilizes the human visual reactions to the constant flickered stimulus quickly showed its potentials among the BCIs used in rehabilitations devices because of its advantages such as a higher immunity to noises and artefacts and also its robustness compared to other BCIs. Rehabilitation exoskeletons demands an approach that are more user friendly and the aspects of control scheme and mechanical parts that are more focused on assisting the patients in rehabilitations and providing a SCI patients an alternatives to explore their surroundings in a more intuitive ways. This paper highlights the current development trends in SSVEP based BCIs for rehabilitation exoskeletons and proposed the potential research scopes in the future that can improve the effectiveness, and its potential applications in rehabilitations.
This study on anthropometrics of Primary School children from grade 1 to 5 in Peninsular Malaysia involves 2310 students aged seven to eleven years old. The objectives were to analyze the differentiation of anthropometrics between children of grades 1 to 5 and grouping them to suitable levels in which they are appropriate to propose chair dimensions. A multi-stage sampling method was used, and rural and urban areas were also included in providing anthropometric database that represents the whole Peninsular Malaysia population. There were six dimensions measured in this study, which are sitting shoulder, sitting subscapular height, sitting elbow height, hip width, buttock-popliteal length and popliteal height. All the measurements were chosen to represent dimensions needed to construct ergonomic school chair. From the results, ANOVA showed p-values of
The main objective of the study is to determine the noise level emitted by the machinery and equipment used at a Liquefied Petroleum Gas in Melaka, Malaysia. The study also aims to determine the exposure level of noise to the employees. The machinery and equipment noise level was measured using a calibrated sound level meter. Noise level of each source was measured by pointing the sound level meter microphone at normal working distance to the source. Personal noise exposure was conducted at the shoulder of the personnel and as close as possible to the personnel’s ear. From a total of 154 noise sources points identified at three work areas surveyed, 122 points were above Action Level of 85 dBA of which 57 points had exceeded the Permissible Exposure Limit of 90 dBA. For the personal exposure monitoring, ten out of fourteen had exceeded the Action Level of 85 dBA for those working for 8 hours and 82 dBA for those working for twelve hours and one of them had exceeded the Permissible Exposure Limit of 87 dBA for those working for twelve hours. The monitored personnel have exceeded the Maximum Level and the Peak Level limit of 115 dBA and 140 dB respectively. From the study, it is concluded that further noise monitoring is needed especially when there are changes to the work process and equipment used. Also the requirement to notify the selected workers on the personal noise exposure result, actions to reduce noise level at the workplace through engineering control methods and administrative controls.
Acoustics issues such as noise in the workplace remains one of the most prevalence occupational hazard especially in
the manufacturing industry with heavy machineries. Increasing mechanization in all industries and most trades has
since proliferated the noise problem. In Malaysia, much has been studied and is known about the auditory effects of
noise. However less attention has been given to the non-auditory effects of noise such as annoyance, stress, and work
performance, and concern about such effects is a relatively recent phenomenon. In view of this, this study aims to
determine the level of noise from different type of machines and tools in a manufacturing plant and also the effects
of noise to the employees. A structured questionnaire was used to assess the effects of noise on the workers and
sound level meter was used to measure the noise level at selected work areas. The results of this study showed that
nearly all the identified work areas exceeded the action level of 85 dB(A) and four of these areas noise levels’ are
more than 90 dB(A) which is the permissible exposure limit according to the Factories and Machinery (Noise
Exposure) Regulations 1989. For the questionnaire, it was found that annoyance topped the noise effects list with
51.4%, followed by stress with 40.0%, hearing deterioration (14.3%) and job performance deterioration (2.9%). As a
conclusion, noise control or preventive measures are suggested in order to minimize the health risks from noise
exposure.
Children are much more likely than adults to get serious injuries in car crashes due to their softer bones, weaker neck muscle and fragile bodies. Child restraint system (CRS) can help in reduce injury and prevent fatality in the event of a crash. Thus the aim of this paper is to gauge the prevalence of CRS usage among guardians of children age below 11 years old. A survey to addressed guardians knowledge on CRS usage, practice and their views on fitting child restraints system to their vehicles were carried out among parents and carers who are caring children aged 11 years old and below. Seventy-four percent (74%) out of 500 respondents cited they have used CRS, however only 40% of them is currently using CRS with their children. Respondent in Kuala Lumpur and younger guardians reported twice likely to use CRS. In addition, graduate respondents are 1.5 times more likely to use CRS for their children. In conclusion, high incorrect usage rate and understanding of the CRS could promote additional injury towards the children in a car crash. Many initiatives could be introduced before the implementation of the CRS law in Malaysia such as awareness, community-based programs and CRS clinics that aim to guide guardians on the correct and effective way of installing the CRS device in their car.