Which of the following is a contributing factor to fatigue?

The identification of hard physical activity and shift work as a contributing factor to fatigue is supported by the understanding of how these elements impact the body's ability to rest and recover. Engaging in strenuous physical activity can lead to physical exhaustion, particularly if the body does not have sufficient time to recuperate. Shift work, on the other hand, often disrupts normal circadian rhythms, leading to sleep deprivation or poor-quality sleep, both of which are significant contributors to increased feelings of fatigue. When individuals work irregular hours or have rotating shifts, they may find it challenging to maintain consistent sleep patterns, further compounding the effects of hard physical exertion. This combination of physical strain and disrupted sleep can lead to a greater risk of fatigue compared to a lifestyle that incorporates regular exercise, a balanced diet, consistent sleep patterns, or frequent social interactions, which generally support better overall energy levels and well-being.