Purpose: This study examines physical fatigue, sleep quality, and cardiovascular health among shift-working mine operators at PT. Manggala Alam Lestari, South Sumatra, using an integrated Sobriety Test and health examination protocol.
Research Methodology: A descriptive cross-sectional design was applied to 50 shift-working mine operators selected through purposive sampling. Data were collected over five days using a four-component Sobriety Test, blood pressure measurement, pulse rate monitoring, and interviews on sleep duration.
Results: Six participants (12%) were classified as unfit based on the Sobriety Test. Four participants (8%) had abnormal blood pressure, and four (8%) showed abnormal pulse rates. Five participants (10%) reported sleeping fewer than six hours per day, and all were identified with health abnormalities or fatigue-related issues. Conversely, all participants sleeping six or more hours per day demonstrated normal cardiovascular indicators. Health abnormalities were concentrated entirely within the sleepdeprived group.
Conclusions: Sleep duration of less than six hours per day was consistently associated with physical fatigue and abnormal cardiovascular indicators. The combined Sobriety Test and health examination protocol is a practical tool for pre-shift fitness-forduty screening.
Limitations: The study involved a small sample from a single mining operation, limiting generalizability. Potential confounding factors such as diet, stress, and physical activity were not assessed.
Contributions: This study provides evidence supporting an integrated fatigue screening approach for Indonesian coal mining workers and offers a low-cost model for pre-shift fitness-for-duty assessment.