How I’m Navigating Exercise Intolerance With IBD
Less force, more support
I’ve always struggled with exercise. Exercise is meant to improve inflammation, energy, mood, muscle mass, insulin sensitivity, and resilience. But when your system is already carrying a high inflammatory burden, exercise can feel less like medicine and more like a stressor your body simply cannot absorb.
I know that feeling well.
There have been many times when exercise did not leave me pleasantly tired or accomplished. It left me really inflamed. When I was younger and an avid swimmer, I would dissolve into a fever straight after an hour in the pool and would have to put myself to bed. This led to me quitting swimming and only participating in sport on and off over the following years, as I just couldn’t build up any tolerance or make any progress with it.
That is what exercise intolerance can feel like with IBD: not just being unfit, but feeling like your body over-responds to the demand.
There are a few reasons I think this can happen from my research.
First, IBD is already an inflammatory condition. Even when symptoms are quieter, the immune system can still be sitting closer to the edge than it should. Research suggests that fatigue in IBD is linked in part to inflammatory signaling, and that while moderate exercise can be helpful overall, harder or prolonged exercise may be more likely to aggravate inflammatory and oxidative stress pathways in susceptible people.
Second, exercise itself temporarily increases oxidative stress. That is not automatically bad; in a healthy system, it is part of the adaptation process. But when you already have gut inflammation, mitochondrial strain, poor recovery, or a reduced antioxidant buffer, that extra oxidative load may tip you into symptoms instead of adaptation. In IBD, lower fitness, higher fatigue, and reduced physical capacity are commonly seen, which helps explain why the same workout can land very differently in someone with a chronically inflamed gut.
Third, the gut barrier, immune system, and nervous system are all involved. If your mucosa is irritated, your immune system reactive, and your stress response already heightened, exercise can act like an amplifier. It is not always the workout itself that is the problem. Sometimes it is the total body burden you are bringing into the workout.
I’ve finally got myself into a position where I am able to exercise again and make some progress with my fitness goals.
So this is what I have been doing.
What I use after exercise
SOD
One of the main things I have been using after exercise is SOD, or superoxide dismutase.
SOD is one of the body’s key antioxidant enzymes. Its job is to help neutralise superoxide radicals, which are one of the reactive oxygen species produced during metabolism and increased physical exertion. In simple terms, it helps deal with some of the oxidative mess created when the body is under stress.
Why that matters to me is this: if exercise is creating more oxidative stress than my body can comfortably buffer, then giving extra support to antioxidant defence makes sense. There is some evidence that SOD-related supplementation may improve antioxidant protection and recovery from exercise stress, although the human evidence is still limited and not specific to Crohn’s disease.
Molecular hydrogen
I have also been using molecular hydrogen.
The reason it interests me is its effect on oxidative stress and inflammatory signalling. Research on hydrogen supplementation suggests it may help improve antioxidant capacity and reduce fatigue-related burden after exercise, though the data is still emerging and the effects are not uniform across studies.
I am using it to try to soften the biochemical hit from exercise so my system does not spiral the way it used to.
What I use the next day
The next day is often when the real reaction used to hit me, so that is where I now focus even more deliberately on calming inflammation.
KPV
The first thing is KPV.
KPV is a small anti-inflammatory peptide that has been studied mostly in experimental models of intestinal inflammation. It has been shown to reduce inflammatory signaling, including NF-κB and MAP kinase pathways, and lower pro-inflammatory cytokine activity in intestinal cells and colitis models.
That matters because if my post-exercise crash is partly my immune system overshooting, then KPV makes sense as a tool aimed at reducing that overreaction.
What interests me most about KPV is that it seems to have particular relevance to the gut rather than being just a generic anti-inflammatory. I see it as support for a system that is too easily provoked.
SOD again
I also use SOD again the next day.
That is because oxidative stress does not necessarily end when the workout ends. The inflammatory and recovery cascade continues afterward. If the next day is when my body tends to feel more inflamed, more tired, or looser in the gut, it makes sense to me to continue supporting antioxidant defence rather than treating the workout itself as the only moment that matters. The rationale here is still about helping my body mop up excess reactive oxygen species and recover with less collateral damage.
Scutellaria
The other thing I use is scutellaria.
Scutellaria baicalensis, and its active compounds like baicalin and baicalein, has been studied for anti-inflammatory, antioxidant, and gut-protective effects. Experimental research suggests it may help downregulate NF-κB-related inflammatory signaling, support intestinal barrier integrity, and reduce colitis severity.
That combination is exactly why it appeals to me. If exercise intolerance in IBD is partly about an exaggerated inflammatory response plus a gut that is already vulnerable, then scutellaria sits in a useful middle ground. It may also help support the gut lining and reduce some of the inflammatory signalling that keeps the whole cycle going.
My overall approach now
I no longer think the answer is to ignore the reaction and keep pushing until my body “gets used to it.”
That did not work for me.
My approach now is to respect the fact that exercise is a stressor, even when it is a healthy one, and to build in support around it so my body can tolerate it better. That means lowering the oxidative hit, calming the inflammatory rebound, and supporting the gut instead of assuming fitness alone will fix the problem.
And honestly, this has been a big mindset shift.
For a long time, exercise intolerance made me feel weak, fragile, or like I was failing. But I do not see it that way anymore. I see it as information. My body is telling me that the load is greater than the recovery capacity. Once I look at it through that lens, the way I need to respond has become a lot clearer.
When a flare hits, the last thing you need is another night of desperate Googling.
You want to know what to reach for, what to pause, and how to give your gut a chance to settle without guessing.
Calm the Flare is a practical, PDF guide that walks you through a simple 3-step framework I use myself to ride out Crohn’s/IBD flares with more stability: Check it out HERE
