Work Fatigue in Phosphoric Acid Industry Workers: How Work shift and Sleep Quality Affect Them?

ABSTRACT Introduction Manpower is a firm asset and it plays a role in determining the quality and quantity of items produced. Labour-intensive activities require a lot of energy. Work fatigue is one of the repercussions experienced by the workforce. This study aims to investigate the relationship between work shifts and sleep quality and subjective work fatigue at the phosphoric acid industry. Material and Method This study was conducted on all 44 workers using a cross-sectional technique. The PSQI questionnaire and the Subjective Feelings of Fatigue questionnaire was conducted to obtain the data. Spearman correlation and contingency coefficient test were used to analyse the data. Result There are 47.7% employees experienced moderate work fatigue. There was a strong relationship between work shift (p=0.637) and sleep quality (p=0.619) with work fatigue. Conclusion Special inspection at 2-4 am should be conducted to monitor the employees.