Exercise as Medicine for Parkinson's Disease

Overview

If you take away only one message from this report, let it be this: any physical activity is better than no physical activity in slowing the progression of Parkinson's disease. The medications we have available today are only for symptomatic treatment—they do not change the disease course. Exercise appears to go one step beyond and protect the brain at the neuronal level.

The pharmaceutical pipeline is advancing. As we covered in Report 2 of this series, lixisenatide (a GLP-1 drug in the same class as Ozempic) slowed motor progression in a 2024 New England Journal of Medicine trial, and prasinezumab (an antibody targeting misfolded alpha-synuclein protein) is advancing to Phase 3 trials. But exercise is available now, accessible to nearly everyone, and the evidence for its neuroprotective effects is arguably as strong as for any drug currently in trials.

Building the Case for Exercise

Over the past decade, researchers have moved from observational studies showing that active people have better outcomes, to randomized controlled trials designed with the same rigor used for pharmaceutical development. Here's what that research has shown:

The SPARX trial (Study in Parkinson Disease of Exercise) was a Phase 2 randomized clinical trial published in JAMA Neurology that had two primary goals: to establish that high-intensity exercise is feasible for people with early Parkinson's disease, and to look for a signal that it might slow disease progression. (The researchers intentionally adopted drug trial terminology—Phase 2 for feasibility and safety, Phase 3 for efficacy—to build equivalent rigor for exercise as a therapeutic intervention.)

The trial enrolled 128 patients with early Parkinson's disease who were not yet taking medications. Participants were randomly assigned to high-intensity treadmill exercise (80-85% maximum heart rate), moderate-intensity exercise (60-65% maximum heart rate), or usual care. The results showed that high-intensity exercise was indeed feasible—and importantly, there was a signal suggesting benefit:

• High-intensity group: Motor symptoms remained essentially unchanged over six months

• Moderate-intensity group: Motor symptoms showed some worsening

• Usual care group: Motor symptoms worsened as expected with typical disease progression

Based on these promising results, SPARX3 (a Phase 3 trial) is now underway at 25 sites across North America to definitively answer whether high-intensity exercise can slow Parkinson's progression. This trial is specifically designed to compare moderate- versus high-intensity aerobic exercise in untreated patients.

The Park-in-Shape trial, published in Lancet Neurology, demonstrated that a home-based cycling program significantly improves motor symptoms compared to stretching exercises over six months. The study found a clinically meaningful difference of 4.2 points on the motor assessment scale—roughly equivalent to what you might expect from adding a dopaminergic medication.

What made this study particularly practical: participants exercised at home on stationary bikes, making it accessible for people who may not be able to get to a gym regularly.

Imaging Evidence: Looking Inside the Brain

A 2024 study from Yale added an intriguing dimension to this research by using advanced brain imaging to look at what happens at the neuronal level. In a small study of 10 patients who completed six months of high-intensity exercise, brain scans showed increases in markers of dopaminergic neuron health in the substantia nigra—the brain region most affected by Parkinson's.

This was a small study, and the findings need to be replicated in larger trials. But it suggests something potentially important: that exercise may not just slow the rate of neuronal loss, but may actually help surviving neurons become healthier and more functional.

The Nuances: Intensity, Duration, and Type

While any activity is beneficial, the research does suggest some nuances worth understanding:

Does Intensity Matter?

Several studies suggest that higher-intensity exercise may provide additional benefits beyond moderate activity. The SPARX trial found that the high-intensity group (80-85% max heart rate) showed less motor symptom progression than the moderate-intensity group (60-65% max heart rate). A meta-analysis found both exercise intensity and total exercise volume were positively associated with changes in BDNF, a key protein involved in neuronal health.

Based on the available evidence, current recommendations suggest: aerobic exercise 3 times per week, 30-40 minutes per session, at 60-80% of heart rate reserve (or 70-85% of maximum heart rate). For those who can't measure heart rate, an intensity of 14-17 on a 20-point rating of perceived exertion scale—where you can talk but not sing—is a reasonable target.

However: The most important comparison isn't high-intensity versus moderate-intensity—it's any exercise versus no exercise. If high-intensity exercise feels daunting or isn't feasible, moderate activity done consistently is far better than an ambitious program you can't maintain.

Duration and Consistency

There's a clear dose-response relationship in the research: benefits are related to how consistently you engage in activity over time. The clinical trials showing benefit typically involved exercise programs lasting six months or longer, with sessions of 30-45 minutes, multiple times per week.

But don't let perfect be the enemy of good. Some activity is better than none, and activity that fits into your life is better than an ideal program you'll abandon after two weeks.

Type of Exercise

Most of the disease-modification research has focused on aerobic exercise—activities that elevate heart rate, like cycling, treadmill walking, or swimming. A 2025 review of exercise in neurodegenerative diseases found that programs combining aerobic and resistance training showed strong neuroprotective effects.

Beyond aerobic exercise, other forms of physical activity have demonstrated benefits for specific Parkinson's symptoms: balance training for fall prevention, resistance training for strength, and activities like dance and boxing that combine physical and cognitive challenge.

Complexity as a Form of Intensity

Here's an important concept: intensity isn't limited to increasing speed or load. It can also mean increasing the complexity of a task—changing the environment or the action to make it more challenging. Walking in an empty hallway on a firm, level surface is different from walking on sand or a hiking trail. Dancing requires coordination, rhythm, and adapting to a partner.

Research on combining motor activities with cognitive challenges—shows particular promise. A 2025 review in Frontiers in Neuroscience (albeit inclusive of other neurodegenerative diseases) noted that this approach "simultaneously addresses both motor and non-motor symptoms by promoting neural plasticity in multiple brain regions." Activities that combine physical and cognitive challenge—cooking, walking while talking to a friend, table tennis, pickleball—may offer compounded benefits. This also means that intensity can be introduced to any activity, regardless of a person's baseline functional level.

Why Does Exercise Work? The Role of BDNF

The strongest evidence for how exercise benefits the brain points to a protein called Brain-Derived Neurotrophic Factor (BDNF)—essentially "fertilizer" for the brain that supports neuronal survival, growth, and communication. A 2021 meta-analysis of 18 randomized controlled trials found that exercise interventions significantly elevated plasma BDNF levels in people with neurodegenerative disorders including Parkinson's, and that increases in BDNF correlated with improvements in motor performance. While exercise likely benefits the brain through multiple pathways—improved blood flow, reduced inflammation, enhanced mitochondrial function—BDNF appears to be a key mediator of exercise's neuroprotective effects.

Getting Started: Practical Tips

The best exercise program is one you'll actually do. Whether you're newly diagnosed or managing more advanced symptoms, there are evidence-based approaches that can work for your situation.

As Beth Popolizio, PT, DPT, NCS, a neurologic rehabilitation clinician, puts it: "Our brains and bodies don't know the difference between sweeping the garage and walking on a treadmill. Introducing more activity into your life can start simply with adding more vigor or intention to things you already do."

Before You Begin

• Medical clearance: If you have Parkinson's or other health conditions, consult your physician before starting a new exercise program, especially high-intensity exercise. Some heart conditions, orthopedic issues, or fall risks may require modifications.

• Medication timing: For those on dopaminergic medications, exercising during "on" periods (when medications are working well) is generally safer and more comfortable.

• Start where you are: If you're currently sedentary, don't jump straight to high-intensity exercise. Build up gradually over weeks to months.

Building Your Program

• Aerobic base: Aim for at least 30 minutes of aerobic activity 3-4 times per week. This could be walking, cycling, swimming, or any activity that elevates your heart rate.

• Add strength: Include resistance training 2-3 times per week to maintain muscle mass and functional strength.

• Add complexity: Consider activities that challenge both body and mind—dual-task activities like walking while talking, cooking, or racquet sports can provide compounded benefits.

• Include balance work: Balance and flexibility exercises help address the postural and stability challenges specific to Parkinson's.

• Make it social: Group exercise classes provide accountability, social connection, and often more engaging activities than solo workouts.

Parkinson's-Specific Exercise Programs

Several national programs have been developed specifically for people with Parkinson's disease:

• Rock Steady Boxing (rocksteadyboxing.org) — Boxing-based fitness classes designed for people with Parkinson's, with 900+ affiliate locations worldwide

• Dance for PD (danceforparkinsons.org) — Founded by the Mark Morris Dance Group, offers classes in 300+ communities across 25+ countries, with in-person, Zoom, and on-demand options

• Parkinson Wellness Recovery (PWR!) (pwr4life.org) — Excellent resource for education and exercise classes based on high-amplitude, large-velocity movements designed to target cardinal symptoms of PD. Free videos of PWR!Moves available online, with a directory of certified instructors

Working with Exercise Professionals

For personalized guidance, consider working with:

• Physical therapists who specialize in neurological conditions can design programs that address specific symptoms and functional goals

• Certified personal trainers with experience working with Parkinson's patients, including PWR!Moves certified therapists, can provide ongoing coaching and progression

A Note for Families

For those supporting a loved one with Parkinson's disease, encouraging and facilitating exercise may be one of the most valuable things you can do. This might mean:

• Researching local Parkinson's exercise classes and offering to provide transportation

• Exercising together—a walking routine, a dance class, or home workouts

• Helping set up home exercise equipment or online class subscriptions

• Providing encouragement and celebrating consistency

• Connecting with physical therapists who can design appropriate programs

Exercise isn't a cure for Parkinson's disease, and it requires ongoing effort to maintain benefits. But the evidence is clear that staying active can meaningfully improve quality of life and may help slow the progression of this challenging condition. That's a powerful tool to have available.