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Fatigue in a medical context is used to cover experiences of low energy that are not caused by normal life. [2] [3]A 2021 review proposed a definition for fatigue as a starting point for discussion: "A multi-dimensional phenomenon in which the biophysiological, cognitive, motivational and emotional state of the body is affected resulting in significant impairment of the individual's ability to ...
For instance, extreme stress (e.g. trauma) is a requisite factor to produce stress-related disorders such as post-traumatic stress disorder. [ 6 ] Chronic stress also shifts learning, forming a preference for habit based learning , and decreased task flexibility and spatial working memory , probably through alterations of the dopaminergic ...
Under "F48.0 Neurasthenia", the characteristics of the disorder differ among various cultures. Two overlapping symptoms can be present: Increased fatigue after mental exertion can be associated with a reduction in cognitive function. Minimal physical effort might be felt as extreme fatigue along with pain and anxiety.
Still, at the time of long term follow-up 7–10 years later, almost half of the participants experienced fatigue and a majority reported a lasting reduction in stress tolerance. [13] The duration of symptoms before the first contact with healthcare is the most significant predictor of the length of recovery.
Traumatic events or any type of shock to the body can cause an acute stress response disorder (ASD). The extent to which one experiences ASD depends on the extent of the shock. If the shock was pushed past a certain extreme after a particular period in time ASD can develop into what is commonly known as Post-traumatic stress disorder (PTSD). [11]
First-time exposure to a stressor will trigger an acute stress response in the body; however, repeated and continuous exposure causes the stressor to become chronic. [4] McEwen and Stellar (1993) argued there is a "hidden cost of chronic stress to the body over long time periods". [8] That is often known as allostatic load.
A stress fracture is a fatigue-induced bone fracture caused by repeated stress over time. Instead of resulting from a single severe impact, stress fractures are the result of accumulated injury from repeated submaximal loading, such as running or jumping. Because of this mechanism, stress fractures are common overuse injuries in athletes. [18]
Directed attention fatigue (DAF) is a neuro-psychological phenomenon that results from overuse of the brain's inhibitory attention mechanisms, which handle incoming distractions while maintaining focus on a specific task. The greatest threat to a given focus of attention is competition from other stimuli that can cause a shift in focus.