Reducing work-related musculoskeletal symptoms through implementation of Kiken Yochi training intervention approach

Work tasks in pineapple plantations in Malaysia are characterised by non-ergonomic work postures, repetitive tasks, awkward posture and manual handling of work tools that contribute to the reporting of musculoskeletal symptoms (MSS). There have been very limited studies performed among pineapple plantation workers focusing on ergonomic intervention programs to specifically reduce MSS.

The aim of this study was to assess the effects of work improvement module using a Kiken Yochi participatory approach intervention in reducing MSS among male migrant pineapple farm plantation workers in Pontian, Johor.

In this interventional study, a total of 68 male migrant workers from two plantation farms were invited to become a participant in this study. In total, 45 participants that consisted of 27 workers for the intervention group and 18 workers for the control group were recruited. The background of workers and MSS were assessed using questionnaires. Ergonomic and postural risks were evaluated and the work tasks with the highest risk were used as a basis for the development of the Kiken Yochi training module. MSS education and training intervention that provided information on proper lifting techniques and education on body mechanics and ergonomics to reduce MSS were implemented to both groups of workers. Kiken Yochi Training was given to the intervention group only. MSS were reassessed after 2 months of the follow-up period. Data was entered into statistical software and were analysed according to objectives.

In terms of the postural risk assessment, almost two-third of the participants (68.5%) had working postures categorized as high risk for MSS. Ergonomic risk assessment identified cultivation, manual weeding and harvesting of pineapples as the work tasks contributing the highest health risks to workers. The most commonly reported MSS between both groups of workers were at the knees, lower back and shoulder area. Upon completion of the delivery of intervention module to both groups of workers, the MSS prevalence reported (after 2 months) were significantly lower for the ankles and feet area within the intervention group.

This study suggested that development and implementation of programs using effective participatory approach training methods are able to prevent selected musculoskeletal problems for this occupation. To enhance the effects of such trainings, modifications of work tools in this occupation are desirable.