What type of fatigue may include stiffness and lack of coordination?

Chronic fatigue is characterized by an enduring sense of tiredness that does not improve with rest, which can lead to various physical symptoms, including stiffness and lack of coordination. This type of fatigue often results from ongoing stress, sleep disturbances, or long-term physical or mental exertion. Unlike acute fatigue, which arises after a short period of intense activity and typically resolves with rest, chronic fatigue persists and can deeply impact performance and health over time.

Chronic fatigue can compromise motor skills and cognitive functions, leading to issues with coordination and physical stiffness. This is particularly important in aviation, where the ability to remain coordinated and alert is critical for safety. Recognizing chronic fatigue allows for better management of workload and stress to mitigate its effects.

Other fatigue types, such as acute, situational, or physical fatigue, have different characteristics and causes, which is why they do not align with the symptoms of stiffness and lack of coordination as defined in this question.