A Modest Edge at Three Months

Teenagers with lingering concussion symptoms improved more with a coached, at-home aerobic exercise program than with stretching, according to a randomized trial published in JAMA Pediatrics. The benefit was real but modest; it was clearest at three months, and it faded by six months as both groups recovered.

The study, led by pediatrician Sara Chrisman of Seattle Children's, enrolled 210 participants ages 11 to 18 across four U.S. states. All still had symptoms and had not been cleared to return to sports. About three-quarters had been hurt in sports-related collisions, ScienceAlert reported.

For parents of high school athletes finishing fall football, soccer and volleyball seasons, the findings add to a growing body of evidence that carefully managed activity, rather than prolonged rest, can help recovery. They do not mean a teen should push through symptoms or return to sports early.

Leaving the Dark Room Behind

For years, the standard advice after a concussion was strict rest, sometimes described as staying in a dark, quiet room until symptoms disappeared. That guidance has shifted. Current care generally favors a short period of relative rest followed by a gradual return to light activity, including aerobic exercise that stays below the level that worsens symptoms.

The logic behind the shift is straightforward. Long periods of inactivity can lead to deconditioning, poor sleep, missed school, and social isolation, which can make some symptoms feel worse. Gradual activity, kept below the point where symptoms flare, aims to break that cycle — and it gives teens a sense of control over their recovery.

Earlier trials supported that change, but mostly for recently injured athletes seen in person. A 2019 JAMA Pediatrics trial of 103 adolescents found that subthreshold aerobic exercise started in the first week after a sport-related concussion led to faster recovery, about 13 days versus 17 days for stretching.

The new study tested something different. Its participants had prolonged symptoms, with injuries an average of about 73 days before enrollment and some up to a year earlier. The program was also delivered remotely, which could make it easier for families far from specialty concussion clinics.

Inside the Six-Week Program

Researchers randomly assigned 104 teens to aerobic exercise and 106 to stretching. Everyone continued their usual concussion care.

The aerobic group received fitness trackers and an initial heart-rate target of about 120 beats per minute, based on age. They started with 10 minutes of exercise and stopped if any symptom rose by two points. Most chose brisk walking or a stationary bike, within limits set by their clinician. As teens tolerated it, the target rose toward about 150 beats per minute and sessions grew longer.

Trained health coaches held weekly video calls with both groups for six weeks. The stretching group did prescribed stretches daily, so both groups received similar attention.

Both groups improved. At three months, the aerobic group's extra improvement averaged about 3 points on a symptom questionnaire where teens scored about 32 at the start, and about 4 points on a quality-of-life measure. No adverse events related to the trial were reported.

At six weeks and six months, the differences between groups were not statistically significant. By six months, both groups had continued to recover and looked similar, Medical Xpress reported.

The 90-Day Window and Its Limits

The most practical finding is also the least certain. In an exploratory analysis, teens who enrolled within about 90 days of their injury gained an additional benefit from exercise. Those enrolled later showed no clear advantage over stretching.

Because that analysis was exploratory, it suggests a pattern rather than proving one — a hint worth testing, not a rule for families to follow. The trial was not designed primarily to test timing, so the 90-day finding needs confirmation in future studies.

The researchers also could not separate the effect of exercise itself from the effect of wearing a tracker or of being told it was okay to be more active. The trial did not measure why exercise might help. Chrisman noted that other research has linked regular exercise to better memory and concentration, possibly involving substances that support nerve-cell growth, but this study did not test that.

Sleep, anxiety, and depressive symptoms improved in both groups, with no clear extra benefit from aerobic exercise. Most injuries were sports-related, so results may not apply equally to concussions from car crashes or falls.

The team summed up its philosophy as "the brain heals by doing." Chrisman's advice was gradual. "The goal is to do a little bit more each day," she told ScienceAlert.

Practical Steps for Families

Parents should treat the study as support for working with a medical provider on a structured activity plan, not as a do-it-yourself program. Chrisman stressed reporting worsening symptoms and avoiding sports and other restricted activities until a clinician gives clearance.

Reasonable steps include asking a pediatrician or concussion specialist whether a supervised, heart-rate-guided walking or cycling plan is appropriate, keeping a simple daily log of symptoms, and stopping activity if headaches, dizziness, or nausea clearly worsen. Families should also coordinate with schools on temporary academic adjustments.

Warning signs that need emergency care include a worsening headache, repeated vomiting, confusion, unusual drowsiness, slurred speech, weakness, or seizures. Those require immediate evaluation.

The bottom line is that coached aerobic exercise gave teens with lingering concussion symptoms a modest head start at three months, especially when it began within about 90 days, but most teens in both groups kept improving. The next step is larger studies to confirm the timing effect.

What Readers Want to Know

What did the study test? Whether a remotely coached aerobic exercise program helped teens ages 11 to 18 with lingering concussion symptoms more than stretching.

What heart rate targets were used? Participants started around 120 beats per minute, based on age, and progressed toward about 150 as tolerated.

How big was the benefit? Modest. About 3 extra points of improvement on a symptom scale and 4 points on quality of life at three months.

Did the benefit last? Differences were not statistically significant at six weeks or six months, when both groups had continued to improve.

Does exercise have to start within 90 days? An exploratory analysis found the clearest benefit for teens enrolled within 90 days of injury, but that finding needs confirmation.

Is strict rest in a dark room still recommended? Current care generally favors a brief period of relative rest followed by a gradual, supervised return to activity.

When should a teen return to sports? Only after a medical provider gives clearance.