Alertness After Night Shifts Among Workers in the Aluminium Industry

Area of Science:

• Occupational Health
• Industrial Hygiene
• Human Factors Engineering

Background:

• Night shift work is prevalent in industries like aluminium production.
• Shift work can negatively impact worker alertness and safety.
• Understanding the effects of consecutive night shifts and varying shift lengths is crucial for workplace safety.

Purpose of the Study:

• To assess alertness changes in aluminium industry workers after night shifts.
• To investigate the influence of consecutive night shifts on alertness.
• To examine the impact of different night shift durations on alertness.

Main Methods:

• A case-crossover study design was employed.
• Alertness was measured using the Psychomotor Vigilance Test (PVT) in 87 aluminium workers.
• Linear mixed models were utilized for statistical analysis.

Main Results:

• Alertness was significantly reduced after three and four consecutive night shifts compared to day shifts.
• No significant difference in alertness was found between three and four consecutive night shifts.
• Alertness did not differ significantly between 8+8+8-hour and 8+12+12-hour night shift schedules.

Conclusions:

• Three and four consecutive night shifts lead to diminished alertness in aluminium industry workers.
• No clear dose-response relationship was observed regarding the number of consecutive night shifts or shift length.
• Findings highlight the importance of managing consecutive night shifts to maintain worker alertness.