where objective post-exertion muscle weakness with delayed recovery time has been measured and is a feature of some of the published definitions.

Asthenia vs. myasthenia

Asthenia or asthaenia (, literally lack of strength but also disease) is a medical term referring to a condition in which the body lacks or has lost strength either as a whole or in any of its parts. It is a poorly defined condition that can include true or primary muscle weakness or perceived muscle weakness.

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