Shift Work: What Impact Does It Really Have on Our Bodies: Taylor Paladino, RN  

Whether you work in mining, healthcare, emergency services, transportation or any other industry that works all hours of the day, shift work can have a significant impact on both your physical and mental health. Mining operations rely heavily on shift work and rotational schedules to keep the sites running safely and efficiently. While these schedules are very necessary it’s important to understand that the human body is not naturally designed to function optimally at all hours of the day and night. 

Circadian Rhythm: What is it and why does it matter? 

At the centre of the issue is your circadian rhythm, essentially this is your body’s internal clock. “Circadian rhythms include some of the physical, mental, and behavioral changes an organism experiences over a 24-hour cycle. Light and dark have the biggest influence on circadian rhythms, but food intake, stress, physical activity, social environment and temperature also affect them.” (National Institute of General Medical Science, 2023). This biological system regulates sleep, hormone production, digestion, body temperature and immune function. Therefore, when you work night shifts or frequently rotate between day and night schedules, that internal clock can become disrupted. 

One of the effects of shift work is sleep deprivation. Despite workers getting the recommended number of hours of sleep throughout the day, the quality of sleep is what matters. As nurses we learn that sleeping during the day often equates to a decreased quality of sleep versus a regular nighttime sleep routine. Environmental factors such as daylight, noise and other responsibilities can make restorative sleep hard to achieve. 

Over time, chronic sleep disruption can lead to persistent fatigue, slower reaction times, reduced concentration and overall impaired judgment or decision-making. In high-risk work environments like mining sites, these effects can contribute to errors, near misses and workplace injuries. 

“The most common health complaint of shift workers in lack of sleep but shift work has also been associated with cardiovascular disease, hypertension and gastrointestinal disorders, and for women, with reproductive health problems and breast cancer.” (Shields, 2002, p.11). Disrupted sleep patterns can contribute to many negative side effects on the body. This includes inflammation, elevated stress levels, metabolic changes that can add to strain on the heart. Working against the body’s natural rhythms can also interfere with digestion leading to symptoms like indigestion, heartburn, bloating and irregular bowel patterns. Eating meals throughout the night when the body is naturally programmed for rest further contributes to everything listed above. 

Weight fluctuations are another common concern in shift-workers. Due to sleep deprivation, hormones are affected that regulate hunger. Shift workers experience an increase of cravings for high-calorie or high-sugar foods while reducing feelings of fullness. This combined with limited opportunities for regular exercise can make maintaining a healthy weight difficult. 

Mental health can also be affected. Due to the shift work and combined isolation of working in remote areas workers may experience an increase in anxiety, social isolation, irritability and mood changes. Shift workers commonly miss out on important personal life events due to their work/sleep schedules. For some individuals, prolonged shift work may cause burnout and depression. 

The immune system is not always adaptable to all these effects. Poor sleep and chronic fatigue can reduce one’s ability to fight off illness, leaving workers much more susceptible to infections and slower recovery when they do become ill. 

Although shift work is not always avoidable, there are strategies that can help reduce its impact. Prioritizing sleep, maintaining a consistent routine when possible, staying physically active, limiting caffeine intake near bedtime, eating a well-balanced diet and creating a dark and quiet sleep environment can help support better recovery between shifts. Shift work is often unavoidable in the mining industry. Understanding its effects can allow workers to recognise early warning signs and take proactive steps to protect their health and ensure they have longevity in their life and career.