Todd Davenport Profile picture
Nov 7, 2022 17 tweets 8 min read Read on X
Hi @ManvBrain. Thanks for an interesting article in @NYMag. What a great premise; to suggest #LongCovid is a condition that rhymes with #MECFS. We totally agree on that. Not everyone with #LongCovid has #MECFS of course, but enough do that the analogy has some intellectual merit.
My name is Todd. I've been involved in #MECFS research and clinical practice for about the past 15 years. Since the start of the pandemic, I've been working to build on efforts of patient-experts to warn folks about the potential and eventuality of post-viral fatigue syndromes.
As you're getting what we'd call post-publication review on the article, and there's no good football games on to watch this evening, I thought I'd connect here to provide a few thoughts. I'm definitely open to discussing these thoughts offline. My DMs, as the kids say, are open.
To answer the question in the title, I'd say 'sure.' Disabling fatigue of post-viral origin has long been the most common illness people have never heard of. Up to 4 million people in the U.S. had #MECFS prior to the COVID and 90% estimated not yet diagnosed. So maybe 40 million.
In any any event, as you rightly point out, the early efforts of patients and scientists, many of whom with #MECFS and acting at great cost to their own wellbeing and functioning, saw the potential need to more research and treatments for the coming pandemic of chronic illness.
Then, as you also rightly point out, the early work of patients and scientists, many of whom living with #LongCovid, working against the clinical and scientific communities, made their own label and also have done much of the formative scholarly work on their *own disease.*
These observations lead to my first takeaway from the article. Patients living with #MECFS and #LongCovid aren't 'militant' as the quote suggests or 'sore losers' because they science didn't go their way; they are the closest thing we have to bonafide experts on these conditions.
Researchers and clinicians like me learn every day from patients living with these conditions. So far, we take ideas, test them, and disseminate the ones that seem to work, but the patients are always ahead of us. We dismiss them or fail to listen to our collective disadvantage.
This observation leads to my second takeaway from the article. Patients have long told us that graded exercise and cognitive behavior therapy don't work well or they cause symptoms to be worse. In the article, you interviewed proponents of these treatments but not the other side.
If you had interviewed folks who work on exercise research paradigms, the article look different. For example, maybe the article would have discussed studies indicating there are problems with metabolic, immune, and neurological functioning that are *worsened with activity.*
And it would be this data that makes cognitive behavior therapy look like a band-aid and graded exercise therapy look harmful. If I had covered up the dateline, I'd have thought this article was published 10 years ago and certainly prior to 2015. We've learned a lot since then.
We learned the shiniest evidence for CBT and exercise wasn't worth the paper it was printed on. By the time the article was published, subjects who worsened could be classified as improved. These were the scientists you chose to quote in the article and defend on social media.
In fact, you'd be hard-pressed to find a clinical guideline in #MECFS and #LongCovid anymore that recommend CBT and graded exercise as a first intervention, because we now know the evidence you have decided is so solid turned out to be more like the emperor's new clothes. Tweet text: If I had to sum...
As a physical therapist, I would love to prescribe exercise for #MECFS and #LongCovid! It would totally align with my professional training and also my worldview as a person and as a clinician. But I don't, at least at first, because it makes people worse.

First, do no harm.
The syllogistic fallacy 'if exercise helps tired people then exercise must help #LongCovid and #MECFS' isn't new. And neither is the article's premise that #MECFS and #LongCovid must be psychogenic, despite not one shred of scientific evidence establishing actual causation.
The article ends with an odd - and oddly strong - bias toward this unproven default psychogenic etiology for #MECFS and #LongCovid. I guess I'll never understand how we can start from the idea of something other than psychiatric disorder causing other conditions -- but not these.
Anyway, as I mentioned, I’m happy for a chat. Or not. Either way. We need to educate the public about #MECFS and #LongCovid, because our governments have decided it’s not worthwhile. The fourth estate is all we have. So we need to make sure we get this right. I’d be glad to help.

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More from @sunsopeningband

Apr 28
Exercising in Long Covid is the source of a lot of discussion on here because we know about a subset people with the disease for whom exercise may be harmful. I have been looking this figure for the past 3 days. There are some issues I'd like to point out. sportsmedicine-open.springeropen.com/articles/10.11…
Image
First, the presence of PEM is a(n absolute or relative) contraindication to physical exercise (depending on many factors). So, the top two boxes of the chart don't make sense together because ruling out contraindications to physical exercise would necessitate ruling out PEM.
Second, I really appreciate the consideration of PEM and PEM staging because I think they do matter. Defining these stages based on the DSQ-PEM may not be valid because the tool was not set up to do this. It is best positioned as the start of a conversation, not the end of one.
Read 20 tweets
Apr 25
This tweet forms the basis for a whole clinical masterclass in "the energy system is broken and all the pacing in the world probably won't fix it enough to respond normally, so stop acting like this is a realistic expectation."
A clinician asking a patient living with PEM to pace on one hand and exercise with the other is usually the living embodiment of the expression "robbing Peter to pay Paul." Worse, we are asking the patient to do less of what they want/need to do in service of an exercise program.
If you've ever lived on a budget, you understand this idea. You have a fixed amount of money. Things like paying a financial adviser might be a fine a choice, but it takes away from basic stuff like buying ramen noodles. Most people have to prioritize based on their own budgets.
Read 5 tweets
Apr 24
@eskabadu Thanks for this interesting question and set of observations. I appreciate you sharing them, as I also appreciate the chance to share. In the first part of the thread, you asked whether I think CPET measures PEM or the energy deficit associated with it. I think it is the latter.
@eskabadu My expertise involves two-day CPETs. In this methodology, a first CPET is used as a physical stressor (more on stressors in a minute) to *induce* PEM. A second CPET 24 hours after the first one is then used to measure the physiology of the post-exertional state.
@eskabadu The difference between the first and second test reflects changes associated with PEM in people with ME/CFS, as well as "ME-subtypes" of other health conditions. We don't expect big differences between tests. ME/CFS is the only one we see a big difference reliably, during PEM.
Read 11 tweets
Mar 18
Look, I’m always perfectly happy to accept interventions like talk therapy and brain retraining might be effective for any range of conditions. My only requirement is for sufficient data supporting the claim. Anecdotes, positive though they may be, need not apply.
I’ll never take away a person’s narrative about what they believe worked for them. In fact, more power to them. But I will always dispute that an individual’s personal narrative should generalize to others in the absence of adequate evidence suggesting that should be the case.
If you think bathing in pancake batter helped you recover from ME/CFS, then by all means continue bathing in all the pancake batter. But don’t suggest that others not bathing in pancake batter is the reason they’re still sick unless you have some kind of evidence it helps others.
Read 5 tweets
Mar 6
Here are some things PEM reliably is that post-exertional fatigue in other conditions reliably is not:
* delayed
* prolonged recovery time
* response to multiple types of exertion, not just physical
* meaningfully impairs function
* involves unusual symptoms that aren’t fatigue
If the module is talking about “scientific facts,” I hope some of the studies comparing and contrasting post-exertional signs and symptoms with deconditioning is getting included. That work is just a short Pubmed search away and it adds some important context to this discussion.
I mean, we’ve know for a quarter of a century or more that there’s a high degree of diagnostic concordance between “CFS” and fibromyalgia. But we’ve not yet had a study comparing conditions on the basis of PEM (not required for the Fukuda case definition). jamanetwork.com/journals/jamai…
Read 6 tweets
Mar 1
Well, since everyone's choosing their little part of the NIH Intramural Study to focus on, let's have a little "phun with physiology." Here's an interesting little factoid related to moderate physical activity as measured by actigraphy.

Dang. So much disuse!

Or is it? Highlighted text: "This was supported by at-home waist actigraphy measures, demonstrating a lower step count and total activity for PI-ME/CFS participants due to less moderate intensity activity (40.64 ± 37.4 versus 6.4 ± 7.0 min/day; p = 0.007)."
I mean after all moderate activity is moderate activity, it isn't a big deal, and maybe people with PI-ME/CFS couldn't do it because they haven't done it. With their effort preference toward low value activities, maybe they didn't want to anyway.

Right? Not so fast, my friends.
Here's this little factoid from the method section. Moderate physical activity is approximated as 3-6 times resting metabolism, which is defined as metabolic output from sitting down, which we also call a MET. So, this level of exertion is what we in the biz call "3-6 METs." Highlighted text: "Minutes where activity counts of the vertical axis of the waist-worn accelerometer fell between 2020 and 5998 were identified as moderate intensity activity, i.e., three to six times the resting metabolism."
Read 17 tweets

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