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Recovery from Exercise in Persons with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS).

Geoffrey E Moore1, Betsy A Keller1,2, Jared Stevens3

  • 1Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853, USA.

Medicina (Kaunas, Lithuania)
|March 29, 2023
PubMed
Summary

Patients with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) experience prolonged post-exertional malaise (PEM) for an average of two weeks after exercise. This contrasts sharply with healthy controls who recover within two days, highlighting a significant difference in symptom duration.

Keywords:
2-day cardiopulmonary exercise testchronic fatigue syndromeexercise recoverymyalgic encephalomyelitispost-exertional malaisespecific symptom severity

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Area of Science:

  • Cardiology
  • Neurology
  • Immunology

Background:

  • Post-exertional malaise (PEM) is a defining symptom of myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS).
  • Quantifying PEM duration after a controlled exertional stressor is crucial for understanding disease impact.
  • Previous research has not adequately characterized PEM symptom duration following standardized exercise testing.

Purpose of the Study:

  • To quantify the duration and severity of PEM symptoms in ME/CFS patients after a 2-day cardiopulmonary exercise test (CPET).
  • To compare PEM recovery times between ME/CFS patients and healthy controls.
  • To establish a quantitative measure for PEM to aid in informed consent for exercise testing.

Main Methods:

  • Eighty ME/CFS patients and 64 healthy controls underwent a 2-day CPET.
  • Symptom Severity Scale (SSS) scores were collected at baseline, pre-CPET, and for 10 days post-CPET.
  • Pharmacokinetic modeling was used to analyze the decay of PEM response.

Main Results:

  • ME/CFS patients required an average of 12.7 days to recover, while controls needed 2.1 days (p < 0.0001).
  • PEM recovery in ME/CFS patients ranged from 1 to 64 days, with prolonged recovery observed in a significant portion.
  • Pharmacokinetic models indicated an extremely prolonged decay of the PEM response in ME/CFS patients.

Conclusions:

  • ME/CFS patients experience significantly longer PEM recovery times compared to healthy individuals.
  • These findings provide quantitative data on PEM duration, essential for patient counseling before exercise testing.
  • Quantitative monitoring of PEM symptoms could be a valuable tool for managing the condition.