Pacing

Why pacing comes first

The most consistent message in ME/CFS care is a cautionary one: doing more than your body can handle can make you worse, sometimes for a long time. Some examples:

• Charité, Berlin (2026): a specialist multidisciplinary programme with tailored inpatient rehabilitation made no difference to physical function at 12 months compared with usual care. On the Bell disability scale, 42 of 94 people (45%) were worse after rehabilitation and only 13 (14%) were better. Controlled¹
• Graded exercise therapy (GET), standard advice for decades, is no longer recommended by the UK’s NICE guideline or the US CDC.^2,3 In patient surveys of more than 16,000 people, 54–81% reported getting worse after GET.^4,5,6 Surveys can over-represent people who had bad experiences, and some clinics still use gentler, symptom-led versions. See Is exercise ever OK? and the debate about GET.

Your energy envelope

Think of your available energy as an envelope, or a daily budget, an idea researchers call the energy envelope theory.^9,10 Pacing means spending inside it:

• Everything costs energy. Walking, standing, showering, cooking, reading, screens, phone calls, decisions, worry, noisy rooms, excitement.
• Your envelope changes. It shrinks with infections, stress, poor sleep and after crashes.
• Overspending gets charged with interest. PEM means you pay back more than you borrowed, a day or two later.

Practical pacing strategies

• Set your cap for your bad days. Plan an amount of activity you could manage even on a bad day.
• Break tasks up. Shower sitting down. Cook in stages. Split phone calls.
• Rest before you’re exhausted. Schedule rest breaks, ideally lying down with your eyes closed and low stimulation.
• Alternate types of activity. Physical, then mental, then rest.
• Sit or lie down wherever possible. Being upright is itself an effort for many people (see POTS).
• Reduce sensory load. Try earplugs, eye masks, sunglasses, dim lights.
• Say no, or “not today”. Protecting your energy is legitimate.
• Use aids without guilt. A shower chair, wheelchair for outings, online shopping, or a disability parking permit all save energy for things you care about.

Using heart rate to pace

Many people use a heart rate monitor to spot over-exertion in real time, because the body often goes over its limit before you feel it.

• A common rule of thumb from the Workwell Foundation is to keep your heart rate below about your 7-day average resting heart rate + 15 beats per minute during activity, especially early on.¹¹ Emerge Australia’s factsheet uses an age-based formula instead.¹² Exercise-testing studies suggest that people with ME/CFS often reach their anaerobic threshold at a lower heart rate than predicted, so age-based formulas can overestimate what’s safe.^13,14 Work out what suits you with your care team.
• Set your watch or app to alert you when you go over that ceiling.
• A drop in your morning heart rate variability (HRV) predicts a worse day: in a study of 4,244 people using a pacing app, a higher morning heart rate and lower HRV predicted worse symptoms that evening.¹⁵ Many patients find it warns them a day or two ahead. It’s a signal to take it easier.

See Wearables & tracking for devices that do this well.

Boom-bust and the good-day trap

Boom-bust

Boom-bust (or “push-crash”) is spending a good day’s energy, then paying for it with a crash, again and again. It’s the most common path into a deeper illness.¹⁰

The good-day trap

Symptoms in ME/CFS go up and down a lot. A run of good days can happen whether or not anything has changed. If you read a good day as “I’m getting better” and spend it (gardening, a big social evening, catching up on jobs), the crash typically arrives 1–3 days later.

The opposite trap: fear-avoidance

Some clinicians also warn about the opposite problem: avoiding everything out of fear of a crash. The goal isn’t to do nothing. It’s to do what you can without triggering PEM, and to rest well. Deconditioning doesn’t explain ME/CFS, but it can add to it, and the CDC notes that “deconditioning is also harmful”.^16,17 If you’re unsure where your limits are, tracking helps (see below).

Is exercise ever OK?

Yes, for some people, done carefully. What current guidelines reject is rigid exercise: programmes that increase activity on a schedule regardless of symptoms, or treat ME/CFS as deconditioning to be trained away. Most also allow a gentler, symptom-led approach.^2,18,19

First: do you have post-exertional malaise?

This is the single most important question, and the evidence splits along it:^20,21

• Without PEM (fatigue that doesn’t crash you a day or two after effort), conventional exercise that builds up gradually is generally appropriate. The World Health Organization takes this line for Long COVID.
• With PEM, pace and stabilise first. Only then consider small, reversible increases, ideally with a physiotherapist or exercise physiologist who understands PEM.

A short standard questionnaire, the DSQ-PEM, can help a clinician check.²² The first large trial to test exercise advice separately for people with and without PEM (the NIH’s RECOVER-ENERGIZE) hasn’t reported its exercise results yet; its pacing results are above.²³

What a careful programme looks like

The UK NICE guideline allows a personalised programme for people who want one, overseen by a specialist physiotherapist. It should:²

1. Set a baseline at a level that doesn't worsen your symptoms, counting physical, mental and emotional effort.
2. Drop below that baseline and hold there for a while.
3. Only if you're stable and want to, make small increases, guided by how you feel over the next 24–72 hours, not by a schedule.
4. Step back at the first sign of a flare, restabilise, and set a new baseline. This isn't failure.

Specialist groups suggest starting with very gentle options: stretching, recumbent (lying or seated) exercise if standing makes you worse, and short bouts with long rests in between, keeping your heart rate below your threshold.^24,11 The US ME/CFS Clinician Coalition notes that for people pacing well, “the expected level of improvement may be small and is not seen in all patients”.²⁵

Questions to ask any clinic offering an exercise programme

1. “Do you increase activity on a schedule, or only when my symptoms show I’m stable?” A fixed schedule regardless of symptoms is rigid GET.
2. “What happens if I crash?” A safe answer: you drop back and restabilise. A red flag: “push through, it’s just deconditioning.”
3. “Have you checked whether I have post-exertional malaise?”
4. “Does my baseline come from my bad days, and does it count mental and emotional effort?”
5. “Is the programme described as a cure?” NICE says no exercise therapy is a cure for ME/CFS.

Tracking: the n=1 approach

You’re the only person who can see how your body responds, and tracking turns guesswork into evidence.

A minimum daily log (takes 30 seconds each night):

1. Energy today (0–10)
2. Brain fog today (0–10)
3. Did I crash? (yes/no)
4. What I did today (brief notes)
5. Sleep quality
6. The start date of any new supplement or medication

Add if you have a wearable: morning HRV and resting heart rate.

After 4–8 weeks, look at averages rather than single days. Are good days becoming more frequent? Do crashes follow big days? It’s also very useful to show your doctor.

An example clinic framework

Some allied health clinics that specialise in ME/CFS, such as Active Health Clinic in Melbourne (with telehealth available), use a structured programme. Common elements include:

• Stabilise first: pace and stop the boom-bust cycle before anything else
• Then work on the pillars: triggers, sleep and the autonomic nervous system
• Then plan for setbacks and gradual goals
• An hour-by-hour activity diary, colour-coded by how much effort each activity took rather than by how you felt, with symptom ratings at the start and end of each day. It’s very useful for spotting boom-bust patterns.

Avoiding infections

A new infection, especially COVID-19, is a common trigger for a major relapse: each reinfection carries fresh risk of long-term problems, and reinfection worsens fatigue and PEM in people who already have Long COVID.^26,27 Reasonable protective steps:^28,29

• Wear a mask in crowded indoor spaces
• Stay up to date with COVID-19 and flu vaccines (discuss timing with your doctor)
• Ask visitors to stay away if they’re even mildly unwell
• Prioritise ventilation, and outdoor catch-ups where possible

Work, study and support

• Talk to your employer or school about reasonable adjustments: reduced hours, working from home, rest breaks, flexible deadlines.
• In Australia, a GP-arranged Chronic Condition Management Plan can subsidise allied health, such as an occupational therapist who understands pacing. See Getting care in Australia.