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- Volume 27, Issue 1, 2015
Ergonomics SA : Journal of the Ergonomics Society of South Africa - Volume 27, Issue 1, 2015
Volume 27, Issue 1, 2015
Author Candice ChristieSource: Ergonomics SA : Journal of the Ergonomics Society of South Africa 27 (2015) http://dx.doi.org/10.4314/esa.v27i1.1 10.4314/esa.v27i1.2More Less
This issue of ErgonomicsSA represents an important shift as we proudly introduce "digital object identifiers" (DOIs) to our manuscripts. As a member of the African Journals Online (AJOL) network (www.ajol.info), we are able to take advantage of the partnership between AJOL and Cross Ref (www.crossref.org), the independent membership association that "connects users to primary research content". A citation-linking network, DOIs reduce the frustration of broken hyperlinks, and ensure a persistent connection to the resource : in this case, your article published in ErgonomicsSA.
Author S.E.H. DaviesSource: Ergonomics SA : Journal of the Ergonomics Society of South Africa 27, pp 2 –12 (2015) http://dx.doi.org/10.4314/esa.v27i1.2More Less
The objective of the study was to ascertain whether selected physiological responses and the perception of effort varied during four different walk protocols where speed increased progressively 3, 4, 5, 6, and 7 km.hr-1 (progressive treadmill walk (PTW); and progressive land walk (PLW); or where the participant adjusted to random changes of speed e.g. 6, 4, 7, 3, and 5 km.hr-1 during a randomized treadmill walk (RTW); and a randomized land walk (RLW). Mean stature and mass of the seven participants was 1.75m and 70kg respectively, with a mean body fat of 15%. Metabolic measures included heart rate, relative oxygen uptake, ventilation, respiration frequency, which increased in a linear fashion up to 6 km.hr-1, however at 7 km.hr-1 there was a significant increase in metabolic response notably during the PLW, and to a similar, although lesser extent in RLW, probably as a consequence of the loss of kinetic energy when turning at each cone in order to maintain the speed during each shuttle. Respiration frequency appeared to be a more sensitive indicator of physical exertion, exhibiting a rapid elevation at 6 km.hr-1. The perception of effort during each mode and at each speed was largely congruent during each walk protocol.
Ergonomic chair explorative intervention study : effect on chronic upper quadrant musculoskeletal dysfunction, disability and productivity in female computer workersSource: Ergonomics SA : Journal of the Ergonomics Society of South Africa 27, pp 13 –32 (2015) http://dx.doi.org/10.4314/esa.v27i1.3More Less
Persistent upper quadrant musculoskeletal pain and disability are common in female computer workers; they are associated with a complex relationship between individual, work-related and psychosocial factors. Upper quadrant musculoskeletal dysfunction has been associated with reduced work performance. Although there is lack of evidence for an adjustable office chair on computer workers' upper quadrant dysfunction and productivity, an adjustable office chair may provide a platform to change the computer workstation set-up and thereby have an effect on upper quadrant musculoskeletal structures. The aim of this two single-subject (n=1) explorative study was to determine whether an adjustable ergonomic office chair was associated with self-reported improvement in chronic upper quadrant musculoskeletal dysfunction and work productivity among female computer workers, compared to a less adjustable ergonomic office chair. Results found a clinically meaningful short-term reduction in both participants' self-reported upper quadrant pain and perceived muscle tension. One participant's results showed a clinically meaningful reduction in self-reported neck disability and work impairment, resulting from the upper quadrant musculoskeletal dysfunction. The other participants' baseline values for both neck disability and work impairment were too low for a meaningful comparison. Study findings indicated that a height-adjustable ergonomic office chair reduced upper quadrant musculoskeletal dysfunction in two female computer workers. This explorative study forms the foundation for further studies that aim to make office chair recommendations for female computer workers to reduce UQ musculoskeletal dysfunction.
Author O.F. ObiSource: Ergonomics SA : Journal of the Ergonomics Society of South Africa 27, pp 33 –45 (2015) http://dx.doi.org/10.4314/esa.v27i1.4More Less
Nigeria is mainly an agrarian society, with the majority of her rural populace involved in agriculture. Agricultural working conditions in Nigeria are extremely difficult due to severe environmental conditions, long working hours, strenuous work and the use of simple farm tools. The extreme working conditions can lead to the development of Musculoskeletal Disorders (MSDs), which have been recognized as the most prevalent of all safety issues in agriculture. This paper reviews the role of ergonomics on sustainable agricultural development in Nigeria. Agriculture plays a key role in the Nigerian economy and hence the need for sustained development within the sector. Ergonomic intervention in Nigeria was identified as a key driver for sustainable development while fostering safety and comfort of agricultural workers. Mechanization alone is not sufficient to achieve the desired development in agriculture due to the high cost associated with it, but with improvement on existing simple tools and modification of existing machines based on ergonomic considerations, sustainable development can be attained. The awareness of ergonomics among stakeholders in the sector and the impact of musculoskeletal disorders on Nigerian agricultural workers were reviewed. The benefits accruable from ergonomic intervention in Nigerian agriculture were also identified.
Evaluation of work related musculoskeletal disorder and postural stress among female potato cultivators in West Bengal, IndiaSource: Ergonomics SA : Journal of the Ergonomics Society of South Africa 27, pp 46 –64 (2015) http://dx.doi.org/10.4314/esa.v27i1.5More Less
Apart from cereal production (rice, wheat, etc.) agricultural labourers are engaged in different vegetable cultivations in West Bengal, India, of which potato cultivation is one of the more important vegetable cultivations. Potato cultivation requires manual work and workers are exposed to extreme postural stresses. The present study was aimed at evaluating the musculoskeletal disorder and postural stress experienced by female workers engaged in potato cultivation. The study was conducted on 155 female cultivators in different districts of West Bengal state (India). A modified Nordic Questionnaire and Body Part Discomfort Scale were applied to identify musculoskeletal disorders (MSDs) in different body parts. The postural stress was analyzed by four methods, viz. OVAKO Working Postures Analysis System (OWAS), Rapid Upper Limb Assessment (RULA), Rapid Entire Body Assessment (REBA), and Quick Exposure Check (QEC). From the results it was revealed that the prevalence of MSDs among the female workers was very high and the most affected areas were the back and upper extremities. Stooping and squatting postures were the dominating postures in potato cultivation jobs. Postural analysis indicated that during potato harvesting the workers were subjected to greater postural stress than that of other tasks. Postural stress might be the reason for the occurrence of MSDs. Thus, immediate ergonomic interventions are needed to reduce work stress of the women potato cultivators by correcting awkward postures.