Why do I crash after activity?
Short answer
A post-activity crash usually means demand exceeded current capacity — often through autonomic, metabolic, or neurological pathways rather than muscular fatigue alone.
More detail
Crashes can come from cardiovascular and autonomic strain (trouble regulating blood pressure, heart rate, and blood flow), from cognitive or sensory overload, from blood-glucose swings, or from inflammation triggered by exertion.
The clinical goal is not to avoid activity indefinitely but to structure activity so it stays sub-threshold while capacity is rebuilt. Random pushing and complete rest are both usually counterproductive.
This information is educational and general in nature. It is not a diagnosis or a treatment plan, and it does not describe every possible cause of a symptom. Individual evaluation is required to determine what applies to any specific case.
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