In a nutshell, the theory says that Long Covid fatigue is caused by faulty wiring in the brain’s fatigue-generating circuitry. This may be conceptualized as the brain having a faulty internal model of the body’s energy state which generates “false alarm fatigue” that the body is running out of energy. Recovery involves reconditioning these circuits by gradually increasing activity levels so the brain learns that the body can handle more exertion...
Nice overview of fatigue. Enjoyed reading.