The Energy Envelope: Pacing for ME/CFS & Long COVID
An informational, pacing-first framework for staying inside your energy envelope and avoiding post-exertional malaise, drawn from Dr. Nancy Klimas's published recommendations, for use alongside specialist ME/CFS or long-COVID care, never as a substitute for it.
This translates Dr. Nancy Klimas's clinical approach (with exercise physiologist Connie Sol at NSU's Institute for Neuro-Immune Medicine) into a self-management framework centered on staying below the anaerobic threshold to avoid post-exertional malaise (PEM), the hallmark of ME/CFS and many long-COVID presentations. It reflects current NICE 2021 guidance that symptom-contingent pacing, not graded exercise therapy, is appropriate for ME/CFS.
Why it worksâ–¼
Track resting heart rate every morning on waking, lying down, before caffeine, for at least a week
Establishes your individual pattern (Klimas/Sol method).
Estimate your anaerobic threshold as a starting point, then refine with a clinician
A starting estimate to refine against real crash patterns, not a fixed rule.
Wear a heart-rate monitor with an alarm set at your threshold and rest when it sounds
Keeps you below the anaerobic threshold that triggers PEM.
End activity while you still feel you could do more; keep activity level steady on good and bad days
Overexerting on good days drives the boom-bust crash cycle (Klimas).
Check blood pressure and heart rate lying down, then after 10 minutes standing, for a week; discuss salt, compression, or medication with your physician if you see a drop or spike
Orthostatic intolerance is common and treatable; informational, not a diagnosis.
Prioritize restorative sleep; make any sleep-medication choices with a physician familiar with ME/CFS
Many patients have non-restorative sleep; some fast-acting sedatives can worsen it.
Break up mental tasks before fatigue peaks; recline rather than sit upright for demanding work
Brain oxygen/energy delivery is often impaired.
Use this as a pacing layer only; individualized medical care (antioxidants, low-dose naltrexone, etc.) is prescribed and monitored by a specialist
This is self-management support, not a treatment plan.
- People diagnosed with ME/CFS or living with long-COVID fatigue who want a structured, physician-informed pacing method
- Caregivers helping someone manage energy limits
- Not for people without a diagnosis seeking a general fatigue fix
- Educational only, not medical advice or a treatment/cure. ME/CFS and long COVID require diagnosis and ongoing care from a physician experienced with post-viral illness
- UK NICE guidance (2021) and this protocol both reject graded exercise therapy (a fixed, scheduled increase in exercise) for ME/CFS because it can cause harm through post-exertional malaise; this is pacing-only and is never license to push activity upward on a schedule
- If you have chest pain, fainting, severe shortness of breath, or a large unexplained heart-rate or blood-pressure swing, seek urgent care; do not use HR pacing as a substitute for a cardiac or autonomic workup
- Anaerobic-threshold formulas here are informational estimates, not a diagnostic tool; get an individualized assessment from a specialist if possible
- Antioxidants, low-dose naltrexone and other clinical interventions are prescribed and monitored by physicians; do not self-start prescription medications or high-dose supplements
- July 3, 2026 Protocol published.
New expert protocols and evidence updates, cited to the source. No spam; unsubscribe anytime.
Not medical advice. This page is for education only and is not a substitute for professional medical care. Consult a qualified clinician before changing your health routine.
Independent curation. YourProtocol.ai is an independent platform. This protocol is based on the publicly available work of Nancy Klimas and is not created, reviewed, endorsed by, or affiliated with Nancy Klimas or MD, Director, Institute for Neuro-Immune Medicine · Nova Southeastern University.