Neural Mechanisms of Fatigue in Post-Acute Sequela of SARS-CoV-2

Inclusion Criteria:

* Age 18 to 75 years old.
* Have received a clinical diagnosis of post-acute sequelae of SARS-CoV-2 (PASC)/long COVID syndrome using the criteria specified by Thaweethai, et al., 2023 (JAMA). This symptom checklist provides a score based on the number and severity of symptoms. An individual with a score \>12 is classified as having PASC.
* Currently experiencing Fatigue/Brain Fog as assessed with the Post-COVID symptom checklist and the PedsQL questionnaire.

Exclusion Criteria:

* Neurological disorders including, but not limited to, stroke, head injury, epilepsy, seizures, brain tumors, brain surgery, Parkinson's Disease, or any other neuromuscular disease (self-report).
* Diagnosed history of severe psychiatric diseases such as depression and schizophrenia (self-report).
* Congestive heart failure.
* Peripheral artery disease with claudication.
* Cancer.
* Pulmonary or renal failure.
* Unstable angina.
* Uncontrolled hypertension (more than 190/110 mmHg).
* Severe aphasia.
* Orthopedic or pain conditions.
* Have had exposure to metal or metal implants, due to the hazardous effects of the magnetic field.
* If on immunomodulatory therapy, they must have been on that therapy for at least 6 months before the start of the study.

Healthy age- and sex-matched controls for PASC - Exclusion criteria: Participants with a history of any of the following will be excluded from the study:

* Hospitalization due to SARS-CoV-2 infection.
* Neurological disorders including, but not limited to, stroke, head injury, epilepsy, seizures, brain tumors, brain surgery, Parkinson's Disease, or any other neuromuscular disease (self-report).
* Diagnosed history of severe psychiatric diseases such as depression and schizophrenia (self-report).
* Congestive heart failure.
* Peripheral artery disease with claudication.