A considerable number of patients who contracted SARS-CoV-2 are affected by persistent multi-systemic symptoms, referred to as Post-COVID Condition (PCC). Post-exertional malaise (PEM) has been recognized as one of the most frequent manifestations of PCC and is a diagnostic criterion of myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). Yet, its underlying pathomechanisms remain poorly elucidated.

Results

Upon physical activity, affected patients exhibit a reduced systemic oxygen extraction and oxidative phosphorylation capacity. Accumulating evidence suggests that these are mediated by dysfunctions in mitochondrial capacities and microcirculation that are maintained by latent immune activation, conjointly impairing peripheral bioenergetics. Aggravating deficits in tissue perfusion and oxygen utilization during activities cause exertional intolerance that are frequently accompanied by tachycardia, dyspnea, early cessation of activity and elicit downstream metabolic effects. The accumulation of molecules such as lactate, reactive oxygen species or prostaglandins might trigger local and systemic immune activation. Subsequent intensification of bioenergetic inflexibilities, muscular ionic disturbances and modulation of central nervous system functions can lead to an exacerbation of existing pathologies and symptoms

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[–] kevindqc@lemmy.world -2 points 1 month ago (1 children)

From ChatGPT:

This passage describes how certain patients have trouble using oxygen efficiently during physical activity. Their bodies can't extract enough oxygen or produce energy effectively because of problems with mitochondria (the parts of cells that generate energy) and poor blood circulation. These issues seem to be linked to a lingering, low-level activation of the immune system.

As a result, their muscles and tissues don’t get enough oxygen when they're active, which leads to symptoms like a fast heartbeat, difficulty breathing, and the need to stop exercising early. Over time, harmful byproducts like lactate (from incomplete energy production), reactive oxygen species (that can damage cells), and prostaglandins (involved in inflammation) build up in the body. This triggers more immune system activity, which worsens the energy problems, disrupts muscle function, and can even affect the brain. This makes existing health issues worse and leads to more severe symptoms during physical exertion.

[–] Neurologist@mander.xyz 9 points 1 month ago

hmmm. To be honest, that’s an okay summary out of context, but it really fails to grasp the essence of the paper. It’s not wrong per say, but it adds irrelevant details while withholding key information. I wouldn’t rely on chatgpt’s summary for this.