The SPARX trial didn't test rope flow. It tested something simpler — and the result is why I train the way I do.
In 2018, researchers published a trial that should have changed how every person with Parkinson's thinks about exercise.
128 people. Newly diagnosed. Not on medication yet.
Half were told to exercise hard — treadmill, four days a week, heart rate at 80–85% of max. The other half got usual care.
Six months later, the exercisers' motor scores had barely moved. The non-exercisers' scores had worsened by roughly 15%.
Same disease. Same six months. One group held their ground. The other slipped.
That's the SPARX trial (Schenkman et al., JAMA Neurology, 2018). And if you or someone you love is dealing with Parkinson's, it's worth understanding exactly what it proved — and what it didn't.
What the trial actually did
SPARX was a phase 2 randomized trial — designed to test whether high-intensity exercise was safe, feasible, and worth studying further in a larger trial. Not a cure test. A "is this worth pursuing" test.
Three groups: high-intensity treadmill (80–85% max heart rate), moderate-intensity treadmill (60–65%), and usual care. Four sessions a week, 26 weeks. Motor symptoms measured with the UPDRS — the standard Parkinson's rating scale, where a higher score means worse symptoms.
The headline number: the high-intensity group's average UPDRS motor change was 0.3. Essentially flat. The usual-care group's was 3.2 — a clear worsening (p = .03).
The detail most people miss
Here's the part that doesn't make the headlines: the moderate-intensity group didn't hold their ground. Their scores worsened by about 8% — better than usual care, but not statistically different from it on the trial's primary measure.
Read that again. Moderate exercise wasn't enough to separate from doing nothing.
The lead researcher, Dr. Margaret Schenkman, put it plainly: "Something is always better than nothing." She's right. But her own data says something more specific: intensity was the difference between holding the line and losing it.
That matters, because most exercise advice given to people with Parkinson's is gentle. Walking. Stretching. Stay comfortable. The trial suggests comfortable might not be where the benefit lives.
What it doesn't prove
Let me be straight with you, because this is where most fitness content goes off the rails:
• This was one phase 2 trial. The authors themselves called for a larger efficacy trial before drawing firm conclusions.
• It tested treadmill exercise. Not rope flow. Not coordination training. A treadmill.
• There are currently zero clinical trials on rope flow for Parkinson's. Zero. Anyone who tells you otherwise is selling something.
• Nobody — not the researchers, not me — is saying exercise cures Parkinson's.
What the trial supports is narrower and still powerful: in early Parkinson's, high-intensity exercise was associated with motor scores holding steady while the non-exercisers declined. That's it. That's the claim. And it's enough to take seriously.
Why I train the way I do
Here's where I connect the dots — and I'll label this clearly as my coaching thesis, not a studied fact.
The trial used a treadmill because treadmills are easy to standardize in research. But a treadmill is the simplest possible movement: straight line, predictable, solved by your brain in the first week.
My argument: if intensity holds the line, complexity is what trains the system behind it. Parkinson's is a disease of the brain's movement circuitry — the basal ganglia losing its ability to generate rhythm and automatic movement. So I train the circuitry directly: rhythm your brain can lock onto, cross-body patterns that force both hemispheres to communicate, rotation in three dimensions, novel problems your brain has to solve in real time.
The trial says: move hard enough to matter. I add: move in ways that give your brain something to work with. Intensity holds the ground. Complexity trains the general.
That's not a studied outcome. That's a coach connecting exercise science to motor neuroscience and testing it in the real world, every day, with real people.
The takeaway
If you're newly diagnosed, or love someone who is: don't wait, don't go gentle by default, and talk to your clinician before starting anything intense. The evidence says the exercisers held their ground. Six months from now, you'll either have trained or you won't. The trial suggests that choice matters.
And if you want a place to start — the same neurological inputs I described above, in short daily sessions — my free Neuro-Reset Protocol is where I put them: skool.com/becoming-undeniable-4193
Educational content, not medical advice. Talk to your clinician or a movement specialist before starting an exercise program — especially a high-intensity one.
Reference: Schenkman M. et al. (2018). Effect of High-Intensity Treadmill Exercise on Motor Symptoms in Patients With De Novo Parkinson Disease: A Phase 2 Randomized Clinical Trial. JAMA Neurology, 75(2), 219–226.
