Sub-Symptom Aerobic Exercise for Post-Concussion Recovery

The old advice was to rest in a dark room after a concussion, but we now know that can actually delay recovery. This brief dives into the evidence for using early, symptom-limited aerobic exercise to help your patients get back to their lives faster and with fewer lingering symptoms.

Research: March 2023

This image illustrates the graduated return-to-play protocol, which often begins with light aerobic exercise as described in this brief.

Key Findings

1Early, sub-symptom threshold aerobic exercise can significantly shorten recovery time in adolescents with sport-related concussion.
2Daily aerobic exercise for 20 minutes at 80% of the heart rate that provokes symptoms is a common and effective protocol.
3The Buffalo Concussion Treadmill Test is a validated method for determining a patient's symptom-exacerbation threshold.
4Compared to rest, a structured, active recovery plan leads to better outcomes and faster return to sport and school.

So, your patient has a concussion. The temptation is to tell them to shut it down completely, but the evidence is pointing us in a different direction. A 2020 systematic review and meta-analysis by Langevin et al. in Medicine & Science in Sports & Exercise looked at seven randomized controlled trials with 326 adolescent athletes. They found that starting a symptom-limited aerobic exercise program in the acute phase—that sweet spot right after injury—had a significant beneficial effect on recovery. The key is working below the symptom-exacerbation threshold. The Buffalo Concussion Treadmill Test is a great way to establish this. You'll have the patient walk on a treadmill at a set speed, gradually increasing the incline every minute. You monitor their heart rate and ask them to rate their symptoms on a scale of 1 to 10. Once their symptoms increase by more than two points from baseline, you've found their threshold. The exercise prescription is then typically 20 minutes of aerobic activity per day at 80% of that threshold heart rate. This could be on a stationary bike, a treadmill, or even just brisk walking. The goal is to increase cerebral blood flow and stimulate the autonomic nervous system without making them feel worse. A 2022 clinical inquiry in American Family Physician reinforced this, giving a Strength of Recommendation of 'A' for using this approach to decrease symptom severity and frequency.

Clinician's Note

What I've found works best is to get these patients moving, but in a very controlled way. The biggest hurdle is often fear. They've been told for so long that any activity is bad, so they're scared to even break a sweat. I spend a lot of time educating them and their parents on the difference between pushing through pain and working just below that symptom threshold. I also make it clear that this isn't a 'no pain, no gain' situation. If their headache or dizziness kicks up, they need to back off immediately. The Buffalo protocol is fantastic, but don't be afraid to modify it. Some kids can't tolerate the treadmill. For them, a stationary bike or even an elliptical can be a great starting point. The key is consistency and careful monitoring.

Clinic Action Plan

1. Patient Selection: This is for patients with acute concussion (within 10 days of injury) who are safe to begin light physical activity. 2. Assessment First: Before starting, perform a thorough clinical exam, including a vestibular/ocular motor screening (VOMS). Then, administer the Buffalo Concussion Treadmill Test to find their symptom-exacerbation heart rate. 3. The Protocol: Prescribe 20 minutes of daily aerobic exercise (stationary bike, treadmill) at 80% of the heart rate identified in the Buffalo test. The patient should monitor their symptoms and stay below a 2-point increase on a 10-point scale. 4. Progression: Once the patient can tolerate 20 minutes of exercise without an increase in symptoms for two consecutive days, you can increase the heart rate target by 5-10 bpm. Repeat the Buffalo test weekly to adjust the program. 5. Red Flags: Watch for any significant increase in symptoms, new neurological signs (like numbness or weakness), or a decline in cognitive function. If any of these occur, stop the exercise program and re-evaluate.

Common Mistakes to Avoid

•Pushing the patient too hard, too soon. This isn't a race.
•Not providing enough education on the difference between safe exertion and symptom exacerbation.
•Failing to re-assess the exercise threshold regularly. As the patient recovers, their tolerance will increase.
•Ignoring the psychological component. Many patients develop anxiety around activity, which needs to be addressed.

Frequently Asked Questions

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